Teletrac VSR User manual

VSR Trouble Shooting Guide
Document No. Preliminary
Rev: 4/27/2012

The following Guide will help in the detailed trouble shooting process of the Teletrac System. To use this trouble shooting guide you
must have knowledge of the Prism unit, wiring, functionality, and be familiar with the Diagnostic MDT. This guide also assumes the
vehicle is parked in a known good coverage area. Because there are very few visual points to the functionality of the Prism unit, most
of the trouble shooting will be done by the results given on the different Diagnostic MDT test screens. Trouble shooting can be broken
down into different sections, power, Comm/Cellular, GPS and peripherals. If the problem is unknown it is best to start with the
MODE Menu on the Diagnostic MDT.
POWER Section1
The Prism unit has no power ……………………………………………………………1.1 through 1.7
MODE (Diagnostic MDT Menu 5) Section 2
The AVLU is not Active ……………………………………………………………..... 2.1 through 2.5
The Modem is not OnLine …………………………………………………………….. 2.7 through 2.12
GPS is not acquired ……………………………………………………………………. 2.14 through 2.15
The FIL is reporting a fault
COMM (Diagnostic MDT Menu 1) Section 3
The MIN does not match the sticker on the Prism unit………………………………….3.1 through 3.2
The Prism unit has low or no RSSI…………………………………………………….. 3.3
The Prism unit is not Registered ………………………………………………………. 3.4 through 3.8
GPS (Diagnostic MDT Menu 2) Section 4
The number of Satellites is less than 4 …………………………………………………. 4.1 through 4.2
The HDP is greater than 5.0 ……………………………………………………………. 4.3
The SNR is too low …………………………………………………………………….. 4.4
GPS is not acquired …………………………………………………………………….. 4.5 through 4.10

I/O (Diagnostic MDT Menu 4) Section 6
The Ignition switch state does not change ……………………………………………… 6.1 through 6.5
FIL(FaultIndicatorLight) Section7
The FIL stays solid or is blinking ……………………………………………………… 7.1 through 7.4
The FIL does not come on when the Ignition is turned on …………………………….. 7.5 through 7.8
J-BUS (Diagnostic Connection) Section 8
The FIL reports “NJ” …………………………………………………………………… 8.1 through 8.7

Section 1 Test Step Result Repair Steps
Prism Power
and
Connections
1.1) Verify the Prism unit is powered
up.
T) The unit has no power - go to
step 1.2
F) Follow repair steps 1a – 1c
1a) Check the Prism power fuse. Replace
if needed. (Always replace fuses with the
same amperage fuse.)
1b) Check the Power connection point
and confirm that connection is solid. Fix
the connection as needed.
1c) Check the Ground connection point
and confirm that the connection is solid
and free from rust or corrosion. Fix the
connection as needed.
1.2) Using a Multimeter verify that there
is +12VDC at the power connection
point.
T) +12VDC is Present - go to step
1.3
F) Follow repair step 2a
2a) Check the vehicle fuse for that power
source. Replace as necessary.
1.3) Trace the power and ground wires
and make sure there are no breaks or
cuts in the wires. Pull gently on each
connection to make sure they are solid.
T) The wires are Ok – go to step
1.4
F) Follow repair step 3a
3a) Fix any cut or broken wires and
connections.
1.4) Remove the 6-Pin Molex
connector from the Prism unit and
confirm with a Multimeter that there is
+12VDC present on the red wire (Pin
6).
T) Power is present - go to step
1.5
F) Follow repair step 4a4a) Replace Power harness.

Section 1 Test Step Result Repair Steps
Prism Power
and
Connections
1.5) With the 6-Pin Molex connector
removed from the Prism unit, test with
a Multimeter that a ground is present
on the Black wire (Pin 5 - only this
black wire should be grounded Pin 3 is
not grounded).
T) Pin 5 has a good ground - go to
step 1.6
F) Follow repair steps 5a5a) Replace Power harness.
1.6) Test the power connection with a
known good Prism unit
T) The unit powers up go to step
6a
F) Call the Teletrac support line 6a) Replace the original Prism unit.