Jeep Wrangler TJ. Manual — part 31
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Disconnect the DRB from the Data Link Connector (DLC).
Disconnect the negative battery cable.
Measure the resistance of the PCI Bus circuit between the Data Link Connector
(DLC) and the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
4
NOTE: Reconnect the PCM harness connector and the negative battery
cable.
Turn the ignition on.
Measure the voltage of the PCI Bus circuit at the Data Link Connector (DLC).
Is the voltage above 7.0 volts?
All
Yes
→ Go To 5
No
→ Go To 6
5
Turn the ignition off.
Using a voltmeter, connect one end to the PCI Bus circuit at the DLC, and the other
end to ground.
Note: When performing the next step turn the ignition off (wait one minute)
before disconnecting any module. When the module is disconnected turn
the ignition on to check for a short to voltage.
Turn the ignition on.
While monitoring the voltmeter, disconnect each module the vehicle is equipped with
one at a time.
Is the voltage steadily above 7.0 volts with all the modules disconnected?
All
Yes
→ Repair the PCI Bus circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the module that when disconnected the short to voltage
was eliminated.
Perform BODY VERIFICATION TEST - VER 1.
121
COMMUNICATION
*PCI BUS COMMUNICATION FAILURE —
Continued
TEST
ACTION
APPLICABILITY
6
Turn the ignition off.
Disconnect the negative battery cable.
Using a ohmmeter, connect one end to the PCI Bus circuit at the DLC, and the other
end to ground.
While monitoring the ohmmeter, disconnect each module the vehicle is equipped with
one at a time.
NOTE: Total bus resistance to ground thru all of the modules is typically
between 350 to 1000 ohms. The more modules on the bus, the lower the total
bus resistance will be.
Is the resistance below 150.0 ohms with all the modules disconnected?
All
Yes
→ Repair the PCI Bus circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the module that when disconnected the short to ground
was eliminated.
Perform BODY VERIFICATION TEST - VER 1.
122
COMMUNICATION
*PCI BUS COMMUNICATION FAILURE —
Continued
Symptom:
*COMPASS/TEMP MODULE WILL NOT CALIBRATE
POSSIBLE CAUSES
CALIBRATION PROCEDURE
COMPASS/TEMPERATURE MIRROR
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Perform the Compass/Temperature module self-check.
Press and hold the Compass/Temperature Mirror Center switch.
Turn the ignition on and then release the Center switch.
NOTE: The Compass/Temp module will illuminate all of the VF segments
and then display an
(F( or (P(.
Exit the self-check by pressing the Center switch or cycling the ignition.
Did the Comp/Temp module display an
9F9 during the self-check?
All
Yes
→ Replace the Compass/Temperature Mirror in accordance with the
Service Information. NOTE: After replacement, set the correct
compass variation and calibrate. The vehicle must be driven for
more than 2 minutes to update the temperature display.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Ensure that all calibration instructions have been performed
properly. If calibration is unsuccessful, replace the Comp/Temp
Mirror in accordance with the Service Information. NOTE: After
replacement, set the correct compass variation and calibrate.
Perform BODY VERIFICATION TEST - VER 1.
123
COMPASS/MINI-TRIP COMPUTER
Symptom:
*COMPASS/TEMPERATURE MODULE INOPERATIVE
POSSIBLE CAUSES
FUSED B(+) CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
GROUND CIRCUIT OPEN
COMPASS/TEMPERATURE MIRROR
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Compass/Temperature Mirror harness connector.
Measure the voltage between the Fused B(+) circuit and ground.
Is the voltage below 10.5 volts?
All
Yes
→ Repair the Fused B(+) circuit for an open. If the fuse is open make
sure to check for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the Compass/Temperature Mirror harness connector.
Turn the ignition on.
Measure the voltage between the Fused Ignition Switch Output circuit and ground.
Is the voltage below 10.5 volts?
All
Yes
→ Repair the Fused Ignition Switch Output circuit for an open. If
the fuse is open make sure to check for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the Compass/Temperature Mirror harness connector.
Measure the resistance between ground and the Ground circuit.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Compass/Temperature Mirror in accordance with the
Service Information. NOTE: After replacement, the vehicle must
be driven for more than 2 minutes to update the display.
Perform BODY VERIFICATION TEST - VER 1.
124
COMPASS/MINI-TRIP COMPUTER
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст