Skoda Octavia 1997 Instruction manual

6HUYLFH 5
6HUYLFH'HSDUWPHQW7HFKQLFDO,QIRUPDWLRQ 3ULQWHGLQ&]HFK5HSXEOLF
6
:RUNVKRS0DQXDO
2&7$9,$  ©
O N:7',(QJLQH)XHO,QMHFWLRQDQG*ORZ
3OXJ6\VWHP
(GLWLRQ 
(QJLQHFRGH
$7'

6HUYLFH
5
7KH:RUNVKRS DQXDOLVLQWHQGHGRQO\IRUXVHZLWKLQWKH2UJDQLVDWLRQâNRGD
,WLVQRWSHUPLWWHGWRSDVVLWRQWRRWKHUSHUVRQV
â.2'$$872DV
3ULQWHGLQ&]HFK5HSXEOLF
6

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
List of Supplements
Edition 12.03
S00.5139.52.20
List of Supplements to Workshop Manual
OCTAVIA 1997
1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Edition 03.01
Supple-
ment Edition Subject Article Number
03.01 Basic Edition S00.5139.50.20
1 04.03 Modifications in Rep. Gr. 01 and 23 S00.5139.51.20
2 12.03 Modifications in Rep. Gr. 01 23 and 28 S00.5139.52.20

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
List of Supplements Edition 12.03
S00.5139.52.20

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Table of Contents
Edition 12.03
S00.5139.52.20
I
Table of Contents
01 – Self-diagnosis
Self-diagnosis I .........................................................................................
- Properties of the self-diagnosis .....................................................................
- Technical data of self-diagnosis .....................................................................
- Connecting vehicle system tester -V.A.G 1552- and selecting the control unit for engine
electronics ..............................................................................................
- Interrogating and erasing fault memory ............................................................
- Actuator diagnosis .....................................................................................
Self-diagnosis II .........................................................................................
- Fault table ..............................................................................................
Self-diagnosis III ........................................................................................
- Readiness code ........................................................................................
- Reading readiness code ..............................................................................
- Generating readiness code ..........................................................................
Self-diagnosis IV .......................................................................................
- Reading measured value block .....................................................................
- Display groups 001 to 022, engine idling ..........................................................
- ........................................................ Display groups 004 through 011 at full load
- Display group 125 - CAN databus ..................................................................
23 – Fuel Formation, Injection
Diesel direct injection system .......................................................................
- Safety measures ......................................................................................
- Rules of cleanliness ...................................................................................
- Overview of fitting location ...........................................................................
- Disassembling and assembling intake manifold ..................................................
- Disassembling and assembling the air filter .......................................................
Disassembling and assembling the unit injector ...............................................
- Summary of components .............................................................................
Testing components ...................................................................................
- Testing lines and components with test box -V.A.G 1598/31- ..................................
- Testing unit injector valve ............................................................................
Testing exhaust gas recirculation ..................................................................
- Connection diagram for vacuum hoses ............................................................
- Testing exhaust gas recirculation ...................................................................
Engine control unit .....................................................................................
- Testing voltage supply for engine control unit ....................................................
- Replacing diesel direct injection system control unit -J248- ....................................
- Coding diesel direct injection system control unit -J248- ........................................
- Activating and deactivating cruise control system (CCS) .......................................
Testing auxiliary signals ..............................................................................
- Testing CAN databus .................................................................................
- Testing the speed signal .............................................................................
28 – Glow Plug System
01-1 page 1
01-1 page 1
01-1 page 1
01-1 page 2
01-1 page 3
01-1 page 5
01-2 page 1
01-2 page 1
01-3 page 1
01-3 page 1
01-3 page 1
01-3 page 2
01-4 page 1
01-4 page 1
01-4 page 1
01-4 page 10
01-4 page 12
23-1 page 1
23-1 page 1
23-1 page 1
23-1 page 2
23-1 page 5
23-1 page 6
23-2 page 1
23-2 page 1
23-3 page 1
23-3 page 1
23-3 page 1
23-4 page 1
23-4 page 1
23-4 page 1
23-5 page 1
23-5 page 1
23-5 page 2
23-5 page 3
23-5 page 4
23-6 page 1
23-6 page 1
23-6 page 2

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Table of Contents Edition 12.03
S00.5139.52.20
II
Testing preheating system ...........................................................................
- Check for proper operation ..........................................................................
- Checking glow plugs ..................................................................................
28-1 page 1
28-1 page 1
28-1 page 2

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis I
Edition 12.03
S00.5139.52.20
01-1 page 1
01
01-1 Self-diagnosis I
Properties of the self-diagnosis
The control unit for the diesel direct injection system is
equipped with a fault memory. The fault memory is de-
signed as a permanent memory.
If malfunctions occur in the monitored sensors or compo-
nents, they are stored in the fault memory with indication
of the fault type. Fault table µChap. 01-2.
Faults which occur only temporarily (sporadically) are
displayed with the suffix „/SP“. Possible causes of spo-
radic faults are e.g. a loose contact or a momentary line
interruption. If a sporadic fault no longer occurs after 50
engine starts, it is automatically erased.
If faults are detected that are likely to influence the driving
behaviour, the glow period warning lamp -K29- flashes.
The stored faults can be read out with the vehicle system
tester -V.A.G 1552-, -V.A.G 1551- or -VAS 5051-
µ01-1 page 2.
After the fault(s) has(have) been removed the fault mem-
ory must be erased µ01-1 page 3.
The following description only relates to vehicle system
tester -V.A.G 1552- using the current program card.
When not using the current program card or when using
the fault read-out scan tool -V.A.G 1551- with integrated
printer or using the vehicle diagnosis, measurement and
information system -VAS 5051- a minor deviation in the
display is possible.
Technical data of self-diagnosis
Interrogating control unit version
The control unit version is displayed once the vehicle sys-
tem tester -V.A.G 1552 - is connected and the engine
electronics control unit is selected µ01-1 page 2.
Available functions when using the vehicle sys-
tem tester -V.A.G 1552-
The preconditions for selecting the desired functions are
given in the following table.
01 – Self-diagnosis
Note

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis I Edition 12.03
S00.5139.52.20
01-1 page 2
01
Connecting vehicle system tester
-V.A.G 1552- and selecting the control
unit for engine electronics
Special tools, test and measuring equipment and
auxiliary items required
ƒVehicle system tester -V.A.G 1552- with cable
-V.A.G 1551/3, 3A, 3B oder 3C-
Test conditions
•Battery voltage at least 11.5 volts
•Earth connection to engine and gearbox O.K.
•Fuses must be OK in compliance with the current flow
diagram.
Procedure
–Connect vehicle system tester - V.A.G 1552- with ca-
ble.
Once the vehicle system tester has been connected:
–Switch on ignition or start µ01-1 page 1 engine de-
pending on the function desired.
ƒIf „data transfer errors“ are displayed as a result of an
incorrect entry, disconnect cable at vehicle system
tester, connect it in again and repeat all the steps.
ƒIf one of the following messages appears in the dis-
play, test the diagnostic cable µCurrent Flow Dia-
grams, Electrical Fault Finding and Fitting Locations
or µOperating Instructions of vehicle system tester.
Operation
Condition
Engine not running,
ignition switched on
Engine idling Normal driving
01 Interrogating control unit
version
yes yes yes
02 Interrogating fault memo-
ry
yes1)
1) Only perform with the ignition on, if the engine does not start.
yes yes
03 Actuator diagnosis yes yes no
04 Basic setting no yes no
05 Erasing fault memory yes yes yes
06 Ending output yes yes yes
07 Coding control unit yes no no
08 Reading measured value
block
yes yes yes
11 Login procedure yes no no
V.A.G 1551/3
1552
V.A.G.
HELP
Q
O
C
9
8
7
6
5
4
3
2
1
V.A.G 1552
S01-0045
Note
Vehicle system test HELP
The control unit does not respond

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis I
Edition 12.03
S00.5139.52.20
01-1 page 3
01
–Operate the vehicle system tester by referring to the
read-out on the display.
Readout on display:
–Enter address word 01 „Engine electronics“ and con-
firm entry with .
The control unit identification appears in the display, e.g.:
ƒ038906019R = Part No. of control unit (for current
control unit version refer to Parts List)
ƒ1.9 ltr. = engine displacement
ƒR4 = engine version (4 cyl. in-line engine)
ƒEDC = Injection system (Electronic Diesel Control)
ƒCC = Cruise control system activated (only on models
with CCS)
ƒ000 = Control unit ID
ƒMG = Manual gearbox
ƒ1053 = Data status (Software version of the control
unit)
ƒCoding 00003 = Coding version of control unit
ƒWSC XXXXX = Workshop identification
ƒIf the control unit version displayed does not corre-
spond to the vehicle, replace the control unit
µChapter 23-5.
ƒIncorrect coding of the engine control unit results in:
ƒHandling problems (jerky gear change, load change
jolts etc.)
ƒIncrease in fuel consumption
ƒIncrease in pollution
ƒStorage of non-existent faults in fault memory
Interrogating and erasing fault memory
Special tools, test and measuring equipment and
auxiliary items required
ƒVehicle system tester -V.A.G 1552- with cable
-V.A.G 1551/3, 3A, 3B oder 3C-
Interrogating fault memory
–Connect vehicle system tester -V.A.G 1552-. Start en-
gine and select address word 01 „Engine electronics“
µ01-1 page 2.
Vehicle system test HELP
Fault in communication set-up
Vehicle system test HELP
K cable does not connect to earth
Vehicle system test HELP
K cable does not connect to pos. term.
Vehicle system test HELP
Enter address word XX
Q
038906019R 1.9l R4 EDC G000SG 1053 ->
Coding 00003 WSC XXXXX
Note

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis I Edition 12.03
S00.5139.52.20
01-1 page 4
01
Only if the engine does not start:
–Switch on ignition.
–Enter function 02 „Interrogate fault memory“ and con-
firm entry with the key.
The number of stored faults or „No fault recognised“ ap-
pears in the display.
If no fault is stored:
–Enter function 06 „End output“ and confirm entry with
.
If one or several faults are stored:
–Press .
Readout on display, e.g.:
–Press .
Fault source and fault type appear in the display, e.g.:
–Press .
The stored faults are displayed in sequence.
–Enter function 06 „End output“ and confirm entry with
.
–Rectify the faults displayed by referring to the fault ta-
ble µChapter 01-2.
When carrying out testing and removal and installation
operations faults such as connector unplugged or CAN
bus faults, may also be detected by other control units.
This is why, when the work is concluded, that it is neces-
sary to interrogate and erase the fault memory on all con-
trol units. For this you must proceed as follows:
–Enter function 00 for „Automatic test sequence“ and
confirm with .
The Vehicle system tester -V.A.G 1552- sends all the
known address words one after the other.
Erasing fault memory
Test conditions
•Fault eliminated
•Fault memory interrogated µ01-1 page 3
After fault elimination the fault memory must again be in-
terrogated and subsequently erased.
–Enter function 05 „Erase fault memory“ and confirm
entry with the key.
Readout on display:
Q
X faults detected!
Q
›
->
Fault number: 16685 P0301 044
›
Cylinder 1 ->
Combustion misfiring detected
›
Q
Note
Q
Note
Q
Vehicle system test ->
Fault memory was erased

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis I
Edition 12.03
S00.5139.52.20
01-1 page 5
01
If the ignition is switched off during „Interrogating fault
memory“ and „Erasing fault memory“, the fault memory is
not erased.
–Enter function 06 „End output“ and confirm entry with
.
–Perform a test drive. Then, once again interrogate the
fault memory. No fault must be displayed.
Actuator diagnosis
With the actuator diagnosis the following parts are acti-
vated in the sequence indicated:
1 - Exhaust gas recirculation valve -N18-
2 - AC compressor engagement
3 - Solenoid valve for charge pressure control
-N75-
4 - Changeover valve for intake manifold flap
-N239-
5 - Glow period warning lamp -K29-
6 - Radiator fan control
7 - Glow plug relay -J52-
8 - Low heat output relay -J359-
9 - High heat output relay -J360-
10 - Fault lamp
ƒActuation of the individual control elements is limited
to 30 seconds.
ƒIf final control diagnosis is to be repeated wirthout
starting the engine in-between, switch ignition off for
about 20 seconds.
Special tools, test and measuring equipment and
auxiliary items required
ƒVehicle system tester -V.A.G 1552- with cable
-V.A.G 1551/3, 3A, 3B oder 3C-
Test conditions
•Fuses must be OK in compliance with the current flow
diagram.
Procedure
–Connect vehicle system tester -V.A.G 1552-. Start en-
gine and select address word 01 „Engine electronics“
µ01-1 page 2.
–Enter function 03 „Final control diagnosis“.
Note
Q
Note

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis I Edition 12.03
S00.5139.52.20
01-1 page 6
01
Readout on display:
The valve must click.
The clicking of the valve cannot be heard because of the
engine noise and can therefore only be checked.
If the valve does not click:
–Testing Exhaust gas recirculation valve -N18 -
µChap. 23-1.
–Press .
Readout on display:
This test step is also activated on vehicles without AC
system.
–Disregard display.
–Press .
Readout on display:
The valve must click.
The clicking of the valve cannot be heard because of the
engine noise and can therefore only be checked.
If the valve does not click:
–Test charge pressure control solenoid valve -N75 -
µChap. 23-1.
–Press .
Readout on display:
The engine must stop.
If the engine does not stop:
–Switch off ignition.
–Inspecting Intake manifold flap change-over valve
-N239- µChap. 23-1.
–Continue final control diagnosis with the engine off
and the ignition switched on.
–Press .
Readout on display:
The warning light for glow period must flash.
If the warning light does not flash:
–Test glow period warning light - K29 - µElectrical
System; Rep. Gr. 90.
–Press .
Readout on display:
Radiator fan control unit -J293- switches the radiator fan
on and off for 30 seconds.
Actuator diagnosis ->
Exhaust gas recirculation valve -N18
Note
›
Actuator diagnosis ->
AC compressor engagement
›
Actuator diagnosis ->
Charge press.control solenoid valve -N75
Note
›
Actuator diagnosis ->
Intake manif.flap change-over valve-N239
›
Actuator diagnosis ->
Glow period warning lamp -K29
›
Actuator diagnosis ->
Radiator fan control

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis I
Edition 12.03
S00.5139.52.20
01-1 page 7
01
If the fan does not run:
–Testing radiator fan -V7- and radiator fan control unit
-J293- µCurrent Flow Diagrams, Fault Finding
Electrics and Fitting Locations.
–Press .
Readout on display:
The relay must click.
It is also possible to observe the relay switching on and
off by the interior light becoming brighter and darker
(caused by the high power consumption of glow plugs).
If the relay does not click:
–Test glow plug relay -J52- µCurrent Flow Diagrams,
Electrical Fault Finding and Fitting Locations.
–Press .
Readout on display:
The relay must click.
If the relay does not click:
–Test low heat output relay -J359- µCurrent Flow Di-
agrams, Electrical Fault Finding and Fitting Locations.
–Press .
Readout on display:
The relay must click.
If the relay does not click:
–Test high heat output relay -J360 - µCurrent Flow Di-
agrams, Electrical Fault Finding and Fitting Locations.
–Press .
Readout on display:
The fault lamp must flash.
If the fault lamp does not flash:
–Test fault lamp µCurrent Flow Diagrams, Electrical
Fault Finding and Fitting Locations.
–Press .
Readout on display:
–Enter function 06 „End output“ and confirm entry with
.
›
Actuator diagnosis ->
Glow plug relay -J52
›
Actuator diagnosis ->
Low heat output relay -J359
›
Actuator diagnosis ->
High heat output relay -J360
›
Actuator diagnosis ->
Fault lamp
›
Vehicle system test HELP
Select function XX
Q

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis I Edition 12.03
S00.5139.52.20
01-1 page 8
01

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis II
Edition 12.03
S00.5139.52.20
01-2 page 1
01
01-2 Self-diagnosis II
Fault table
ƒThe fault table is ordered according to the 5-digit fault code on the left.
ƒThe SAE code which is displayed on the right next to the fault code (e.g. P0107) can be ignored (at present only
valid for USA).
ƒExplanations regarding fault types (e.g. „open circuit or short-circuit to earth“) µOperating instructions for the ve-
hicle system tester.
ƒIf parts are output as faulty: First of all test all leads and plug connections to these components, as well as the earth
connections according to current flow diagram. Only if no fault is detected here should the part be replaced. This
applies in particular if faults are shown as „sporadic“ (SP).
ƒIf „Info in literature“ appears in the display of the vehicle system tester - V.A.G 1552- look for the text required in
the fault table under the fault code.
Readout on -V.A.G 1552- Rectifying fault
16485
Air mass meter -G70
Implausible sig-
nal
–Test air mass meter -G70 - µChap. 01-4, display group 003
16684
Combustion misfiring
detected
–Test compression µ1.9/74 kW (TDI) Engine, Mechanical Compo-
nents; Rep. Gr. 15.
–Check unit injector µChap. 23-3
16685
Cyl. 1 combustion mis-
firings detected
16686
Cyl. 2 combustion mis-
firings detected
16687
Cyl. 3 combustion mis-
firings detected
16688
Cyl. 4 combustion mis-
firings detected
16705
Engine speed sender -
G28
Implausible sig-
nal
–Inspecting Engine speed sender -G28- µChap. 23-1
16706
Engine speed sender -
G28
No signal –Inspecting Engine speed sender -G28- µChap. 23-1
–Check wiring according to current flow diagram µCurrent Flow Dia-
grams, Electrical Fault Finding and Fitting Locations
–Replace diesel direct injection system control unit -J248- µChap.
23-5
16725
Camshaft pos. sensor
=> Sender -G40
Implausible sig-
nal
–Test camshaft position sensor -G40- µCurrent Flow Diagrams,
Electrical Fault Finding and Fitting Locations
–Remove open circuit in wiring or short circuit according to current
flow diagram µCurrent Flow Diagrams, Electrical Fault Finding and
Fitting Locations
–Test position of camshaft and sensor rotor µ1.9/74 kW (TDI) En-
gine, Mechanical Components; Rep. Gr. 15.
16885
Vehicle speed signal
Implausible sig-
nal
–Test vehicle speed signal µChapter 23-6
Note

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis II Edition 12.03
S00.5139.52.20
01-2 page 2
01
16944
Voltage supply
Implausible sig-
nal
–Test cables to diesel direct injection system control unit - J248- ac-
cording to the current flow diagram µCurrent Flow Diagrams, Elec-
trical Fault Finding and Fitting Locations
16946
Voltage supply
Voltage too low
16947
Voltage supply
Voltage too high
16955
Brake light switch -F
Implausible sig-
nal
–Test brake light switch - F- and brake pedal switch -F47- µChap.
01-4, display group 006
16989
Control unit defective
–Replace diesel direct injection system control unit -J248 - µChap.
23-5
17552
Air mass meter -G70
Open circuit or
short circuit to
earth
–Test air mass meter -G70- µChap. 01-4, display group 003
–Check wiring according to current flow diagram µCurrent Flow Dia-
grams, Electrical Fault Finding and Fitting Locations
–Replace diesel direct injection system control unit -J248- µChap.
23-5
17553
Air mass meter -G70
Short circuit to
positive
17554
Air mass meter -G70
Voltage supply
17563
Intake manifold pres-
sure sender -G71
Short circuit to
positive
–Test intake manifold pressure sender -G71- µCurrent Flow Dia-
grams, Electrical Fault Finding and Fitting Locations
–Check wiring according to current flow diagram µCurrent Flow Dia-
grams, Electrical Fault Finding and Fitting Locations
–Replace diesel direct injection system control unit - J248 - µChap.
23-5
–Test intake manifold pressure µChap. 01-4, display group 010
17564
Intake manifold pres-
sure sender -G71
Open circuit or
short circuit to
earth
17565
Intake manifold pres-
sure sender -G71
Voltage supply
17568
Intake manifold tem-
perature sender -G72
Short circuit to
earth
–Test intake manifold temperature sender -G72- µChap. 01-4, dis-
play group 007
–Check wiring according to current flow diagram µCurrent Flow Dia-
grams, Electrical Fault Finding and Fitting Locations
–Replace diesel direct injection system control unit -J248 - µChap.
23-5
17569
Intake manifold tem-
perature sender -G72
Open circuit/
Short circuit to
positive
17570
Fuel temperature
sender -G81
Short circuit to
earth
–Test fuel temperature sender -G81- µChap. 01-4, display group
007
–Check wiring according to current flow diagram µCurrent Flow Dia-
grams, Electrical Fault Finding and Fitting Locations
–Replace diesel direct injection system control unit - J248 - µChap.
23-5
17571
Fuel temperature
sender -G81
Open circuit/
Short circuit to
positive
17663
Coolant temperature
sender -G62
17664
Coolant temperature
sender -G62
Short circuit to
earth
–Test coolant temperature sender -G62- µChap. 01-4, display group
007
–Check wiring according to current flow diagram µCurrent Flow Dia-
grams, Electrical Fault Finding and Fitting Locations
–Replace diesel direct injection system control unit -J248 - µChap.
23-5
Readout on -V.A.G 1552- Rectifying fault

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis II
Edition 12.03
S00.5139.52.20
01-2 page 3
01
17668
Unit injector solenoid
valve cyl. 1 -N240
Implausible sig-
nal
–Check unit injector µChap. 23-3
17669
Unit injector solenoid
valve cyl. 1 -N240
Regulating limit
exceeded
17670
Unit injector solenoid
valve cyl. 1 -N240
Regulating limit
not reached
–Check unit injector µChap. 23-3
–Test fuel supply µ1.9/74 kW (TDI) Engine, Mechanical Compo-
nents; Rep. Gr. 20
17671
Unit injector solenoid
valve cyl. 2 -N241
Implausible sig-
nal
–Check unit injector µChap. 23-3
17672
Unit injector solenoid
valve cyl. 2 -N241
Regulating limit
exceeded
17673
Unit injector solenoid
valve cyl. 2 -N241
Regulating limit
not reached
–Check unit injector µChap. 23-3
–Test fuel supply µ1.9/74 kW (TDI) Engine, Mechanical Compo-
nents; Rep. Gr. 20
17674
Unit injector solenoid
valve cyl. 3 -N242
Implausible sig-
nal
–Check unit injector µChap. 23-3
17675
Unit injector solenoid
valve cyl. 3 -N242
Regulating limit
exceeded
17676
Unit injector solenoid
valve cyl. 3 -N242
Regulating limit
not reached
–Check unit injector µChap. 23-3
–Test fuel supply µ1.9/74 kW (TDI) Engine, Mechanical Compo-
nents; Rep. Gr. 20
17677
Unit injector solenoid
valve cyl. 4 -N243
Implausible sig-
nal
–Check unit injector µChap. 23-3
17678
Unit injector solenoid
valve cyl. 4 -N243
Regulating limit
exceeded
17679
Unit injector solenoid
valve cyl. 4 -N243
Regulating limit
not reached
–Check unit injector µChap. 23-3
–Test fuel supply µ1.9/74 kW (TDI) Engine, Mechanical Compo-
nents; Rep. Gr. 20
17795
Control unit defective
–Replace diesel direct injection system control unit -J248 - µChap.
23-5
17810
Exhaust gas recircula-
tion valve -N18
Short circuit to
positive
–Test exhaust gas recirculation valve -N18- with final control diagno-
sis µChap. 01-1
–Inspecting exhaust gas recirculation µChap. 23-4
17849
Exhaust gas recircula-
tion valve -N18
Open circuit or
short circuit to
earth
17910
Fuel pump relay -J17
Short circuit to
positive
–Testing fuel pump relay -J17- µCurrent Flow Diagrams, Electrical
Fault Finding and Fitting Locations
17911
Load signal for alter-
nator terminal DF
Implausible sig-
nal
–Test generator µCurrent Flow Diagrams, Electrical Fault Finding
and Fitting Locations and µElectrical System; Rep. Gr. 27
–Reading measured value block, display group 016 µChap. 01-4
Readout on -V.A.G 1552- Rectifying fault

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis II Edition 12.03
S00.5139.52.20
01-2 page 4
01
17931
Crash signal from air-
bag CU
Implausible sig-
nal
–Test airbag system µBody Work; Rep. Gr. 01
17932
Fuel pump relay -J17
Open circuit or
short circuit to
earth
–Testing fuel pump relay -J17- µCurrent Flow Diagrams, Electrical
Fault Finding and Fitting Locations
17948
Vehicle speed signal
Signal too high –Test vehicle speed signal µChapter 23-6
–Test CAN databus lines µChapter 23-6
–Test dash panel insert µElectrical System; Rep. Gr. 90
17954
Charge pressure con-
trol solenoid valve -
N75
Short circuit to
positive
–Test charge pressure control solenoid valve -N75- with final control
diagnosis µChap. 01-1
17957
Charge pressure con-
trol solenoid valve -
N75
Open circuit or
short circuit to
earth
17958
Charge pressure
Control differ-
ence
–Test charge pressure control solenoid valve - N75- with final control
diagnosis µChap. 01-1
–Reading measured value block, display group 010 µChap. 01-4
–Test charge pressure control µ1.9/74 kW (TDI) Engine, Mechanical
Components; Rep. Gr. 21
17964
Charge pressure con-
trol
Regulating limit
not reached
17965
Charge pressure con-
trol
Regulating limit
exceeded
17977
Cruise control system
switch -E45
Implausible sig-
nal
–Analyse measured value block, display groups 006 and 022
µChap. 01-4
–Read out fault memory of the electrical system control unit
µElectrical System; Rep. Gr. 90
17978
Engine control unit
blocked1)
–Adapt diesel direct injection system control unit - J248- to electronic
immobiliser µElectrical System; Rep. Gr. 96
–Test immobiliser µElectrical System; Rep. Gr. 96
18008
Voltage supply termi-
nal 15
Voltage too low –Test voltage supply for diesel direct injection system control unit
-J248- µChap. 23-5
18009
Voltage supply relay
terminal 30 -J3172)
Implausible sig-
nal
–Test diesel direct injection system relay -J322- µCurrent Flow Dia-
grams, Electrical Fault Finding and Fitting Locations
18017
Crash disconnect acti-
vated
–Read out fault memory of airbag control unit µBody Work;
Rep. Gr. 01
–Replace airbag control unit µBody Work; Rep. Gr. 69
18020
Engine control unit
Incorrectly cod-
ed
–Code diesel direct injection system control unit -J248- µChap. 23-5
18024
Glow period warning
lamp -K29
Short circuit to
positive
–Test glow period warning lamp -K29- with final control diagnosis
µChap. 01-1
18025
Glow period warning
lamp -K29
Open circuit or
short circuit to
earth
Readout on -V.A.G 1552- Rectifying fault

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis II
Edition 12.03
S00.5139.52.20
01-2 page 5
01
18026
Glow plug relay -J52
Short circuit to
positive
–Test glow plug relay -J52 - with final control diagnosis µChap. 01-1
18027
Glow plug relay -J52
Short circuit to
earth
18039
Accelerator pedal po-
sition sender -G79
Signal too high –Test accelerator pedal position sender -G79- µChap. 01-4, display
group 002
18040
Accelerator pedal po-
sition sender -G79
Voltage supply
18043
Data BUS drive
Missing mes-
sage from air
conditioning
system CU
–Test CAN databus lines µChapter 23-6
–Read out air conditioning system control unit fault memory
µHeating, Air conditioning; Rep. Gr. 01
18044
Data BUS drive
Missing mes-
sage from air-
bag CU
–Test CAN databus lines µChapter 23-6
–Read out fault memory of airbag CU µBody Work; Rep. Gr. 01
18045
Data BUS drive
missing mes-
sage form elec-
tron. CU
–Test CAN databus lines µChapter 23-6
–Read out fault memory of electrical system control unit µElectrical
System; Rep. Gr. 90
18047
1/2 for accelerator
pedal position sender -
G79+G185
Implausible sig-
nal
–Test accelerator pedal position sender -G79- µChap. 01-4, display
group 002
–Replace diesel direct injection system control unit -J248- µChap.
23-5
18048
Control unit defective
–Replace diesel direct injection system control unit -J248 - µChap.
23-5
18056
Data BUS drive
defective –Test CAN databus lines µChapter 23-6
–Read out fault memory of engine CU µChapter 01-1
18057
Data BUS drive
Missing mes-
sage from ABS
CU
–Test CAN databus lines µChapter 23-6
–Read out fault memory of ABS control unit µChassis; Rep. Gr. 45
18058
Data BUS drive
Missing mes-
sage from com-
biinstrument
–Test CAN databus lines µChapter 23-6
–Read out fault memory of dash panel insert µElectrical System;
Rep. Gr. 90
18062
Read out fault memory
of combiinstrument
–Perform self-diagnosis of the dash panel insert µElectrical System;
Rep. Gr. 01
18065
Air conditioning sys-
tem inlet/outlet
Short circuit to
positive
–Test AC compressor control with final control diagnosis µChap. 01-
1
18067
Radiator fan control 1
–Test radiator fan control with final control diagnosis µChap. 01-1
18071
Actuation of unit injec-
tor solenoid valve
Short circuit to
positive
–Check unit injector µChap. 23-3
18072
Actuation of unit injec-
tor solenoid valve
Electrical fault in
the circuit
18073
Actuation of unit injec-
tor solenoid valve
Mechanical fault –Replacing unit injector µChap. 23-2
Readout on -V.A.G 1552- Rectifying fault

OCTAVIA 1997 1.9/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Self-diagnosis II Edition 12.03
S00.5139.52.20
01-2 page 6
01
18074
Unit injector solenoid
valve cyl. 1 -N240
Electrical fault in
the circuit
–Test unit injector µChap. 23-3
18075
Unit injector solenoid
valve cyl. 2 -N241
18076
Unit injector solenoid
valve cyl. 3 -N242
18077
Unit injector solenoid
valve cyl. 4 -N243
18080
Radiator fan control 1
Open circuit or
short circuit to
earth
–Test actuation of radiator fan -V7- with final control diagnosis
µChap. 01-1
18090
Data BUS drive
implausible
message from
ABS CU
–Test CAN databus lines µChapter 23-6
–Read out fault memory of ABS control unit µChassis; Rep. Gr. 45
18097
Data BUS drive
Implausible
message from
electron. CU
–Test CAN databus lines µChapter 23-6
–Read out fault memory of electrical system control unit µElectrical
System; Rep. Gr. 90
19456
Glow period warning
lamp -K29-
Missing mes-
sage from com-
biinstrument
–Test CAN databus lines µChapter 23-6
19458
Kick-down switch -F8-
Implausible sig-
nal
–Test accelerator pedal position sender -G79- µChap. 01-4, display
group 002
19459
Low heat output relay -
J359
Short circuit to
positive
–Test low heat output relay -J359- with final control diagnosis
µChap. 01-1
19461
High heat output relay
-J360
–Test high heat output relay -J360- with final control diagnosis
µChap. 01-1
19463
Camshaft pos. sensor
=> Sender -G40
No signal –Test camshaft position sensor -G40- µCurrent Flow Diagrams,
Electrical Fault Finding and Fitting Locations
–Test position of camshaft and sensor rotor µ1.9/74 kW (TDI) En-
gine, Mechanical Components; Rep. Gr. 15.
19464
Camshaft pos. sensor
=> Sender -G40
Signal outside
tolerance
–Test camshaft position sensor -G40- µCurrent Flow Diagrams,
Electrical Fault Finding and Fitting Locations
–Remove open circuit in wiring or short circuit according to current
flow diagram µCurrent Flow Diagrams, Electrical Fault Finding and
Fitting Locations
–Test position of camshaft and sensor rotor µ1.9/74 kW (TDI) En-
gine, Mechanical Components; Rep. Gr. 15.
Readout on -V.A.G 1552- Rectifying fault