Jeep XJ. Manual — part 885
7.0
DIAGNOSTIC INFORMATION AND
PROCEDURES
9
Symptom:
*NO RESPONSE FROM TRANSMISSION CONTROL MODULE
POSSIBLE CAUSES
GROUND CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
CCD BUS (+) CIRCUIT OPEN
CCD BUS (-) CIRCUIT OPEN
TRANSMISSION CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the TCM harness connector.
Measure the resistance between ground and the ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Ground circuit for an open.
Perform AW4 TRANS VERIFICATION TEST-VER1.
2
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the TCM harness connector.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the Fused Ignition Switch Output circuit for an open.
Perform AW4 TRANS VERIFICATION TEST-VER1.
3
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the TCM harness connector.
Connect a jumper wire between the CCD Bus (+) circuit and ground.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO GROUND?
All
Yes
→
No
→
Repair the CCD Bus (+) circuit for an open.
Perform AW4 TRANS VERIFICATION TEST-VER1.
10
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the TCM harness connector.
Connect a jumper wire between the CCD Bus (-) circuit and ground.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO GROUND?
All
Yes
→
No
→
Repair the CCD Bus (-) circuit for an open.
Perform AW4 TRANS VERIFICATION TEST-VER1.
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the Transmission Control Module.
Perform AW4 TRANS VERIFICATION TEST-VER1.
11
COMMUNICATION
*NO RESPONSE FROM TRANSMISSION CONTROL MODULE —
Continued
Symptom:
P0122-THROTTLE POSITION SENSOR
When Monitored and Set Condition:
P0122-THROTTLE POSITION SENSOR
When Monitored:
Continuously with the ignition key on.
Set Condition:
The Throttle Position Sensor Signal circuit is out of range for 7 seconds or
the Sensor Ground circuit is open or shorted to voltage for 7 seconds.
POSSIBLE CAUSES
TPS DTC’S PRESENT IN THE PCM
INTERMITTENT WIRING AND/OR CONNECTORS
TPS SIGNAL CIRCUIT OPEN
TPS SENSOR GROUND CIRCUIT OPEN TO TCM
TPS SIGNAL CIRCUIT SHORTED TO GROUND
TPS SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
TPS SIGNAL CIRCUIT SHORTED TO VOLTAGE
TCM-TPS CIRCUIT
TEST
ACTION
APPLICABILITY
1
NOTE: Always perform diagnostics with a fully charged battery to avoid
diagnosing false symptoms.
NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the service information.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Verify the brake switch input to the TCM is working correctly.
Perform the shift lever position test and adjust the linkage if necessary.
Test drive vehicle to verify customer complaint.
With the DRBIII
t, read the PCM DTC’s. Check and repair all PCM DTC’s before
performing transmission diagnostics.
With the DRBIII
t, read the TCM DTC’s.
Note: Check 1 trip failures and diagnose them as DTC’s (Hard codes)
Most DTC’s set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
Note: Verify flash level of transmission controller. Some problems are
corrected by software upgrades to the transmission controller.
NOTE: Check for applicable TSB’s related to the problem.
Perform this procedure prior to symptom diagnosis.
All
Continue
12
TRANSMISSION
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