Jeep XJ. Manual — part 886
TEST
ACTION
APPLICABILITY
2
When monitored: Continuously with the ignition key on.
When set: 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.
This is the When monitored / When set conditions for DTC P0122.
All
Continue
3
With the DRBIII
t, read PCM DTC’s.
Are there any TPS related DTC’s stored in the PCM?
All
Yes
→
Repair all Powertrain TPS codes before performing the Transmis-
sion diagnostics.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
4
Start the engine. Allow the engine to idle.
With the DRBIII
t, Check the Throttle Position Sensor Voltage under Transmission
sensors.
Is the Throttle Position Sensor voltage below 0.3 or above 1.0 volts?
All
Yes
→
No
→
5
Ignition Off.
Disconnect the Throttle Position Sensor (TPS).
Disconnect the Transmission Control Module (TCM).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the TPS Signal Circuit from the TCM connector to the TPS
Connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open TPS Signal circuit.
Perform AW4 TRANS VERIFICATION TEST-VER1.
6
Ignition Off.
Disconnect the TPS harness connector.
Disconnect the TCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Sensor Ground Circuit between the TPS connector and
the Transmission Control Module connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open TPS Sensor Ground circuit.
Perform AW4 TRANS VERIFICATION TEST-VER1.
13
TRANSMISSION
P0122-THROTTLE POSITION SENSOR —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Disconnect the Transmission Control Module harness connector.
Note: Check connectors - Clean/repair as necessary.
With an Ohmmeter, measure the TP Sensor Signal Circuit to ground at the TCM
connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the TPS Signal circuit for a short to ground.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
8
Turn the igntion off.
Disconnect the Throttle Position Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
With a Voltmeter, measure the TPS Sensor Ground Circuit.
Is the voltage above 0.2 volts?
All
Yes
→
Repair the TPS Sensor Ground circuit short to voltage.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
9
Turn the igntion off.
Disconnect the Throttle Position Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
With a Voltmeter, measure the Throttle Position Sensor Signal Circuit.
Is the voltage above 5.0 volts?
All
Yes
→
Repair the TPS Signal circuit for a short to voltage.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
10
If there are no possible causes remaining, view repair.
All
Repair
Replace the TCM.
Perform AW4 TRANS VERIFICATION TEST-VER1.
11
Using the when monitored / when set conditions, attempt to reset the DTC. If the
DTC can be reset return to the symptom list and perform the appropriate diagnostic
test.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
NOTE: Check the Technical Service Bulletins.
Were any problems found?
All
Yes
→
Repair the wiring and/or connectors as necessary.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
Test Complete.
14
TRANSMISSION
P0122-THROTTLE POSITION SENSOR —
Continued
Symptom:
P0562-TRANSMISSION VOLTAGE LOW
When Monitored and Set Condition:
P0562-TRANSMISSION VOLTAGE LOW
When Monitored:
Continuously with the key on.
Set Condition:
The voltage on the Fused B(+) circuit falls below 10.0 volts for 1 minute.
POSSIBLE CAUSES
CHARGING SYSTEM DTC’S PRESENT IN THE PCM
INTERMITTENT WIRING AND/OR CONNECTORS
TCM FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE
TCM GROUND CIRCUIT HAS OPEN OR HIGH RESISTANCE
TCM-FUSED B+ SUPPLY
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
2
When monitored: Continuously with the ignition key on.
When set: The voltage on the Fused B(+) circuit falls below 10.0 volts for 1 minute.
This is the When monitored / When set conditions for DTC P0562.
All
Continue
15
TRANSMISSION
TEST
ACTION
APPLICABILITY
3
With the DRBIII
t, read the PCM DTC’s.
NOTE: Also check for Charging System no DTC’s present symptom’s.
Are there any Charging system DTC’s, stored in the PCM.
All
Yes
→
Refer to the Charging category and perform the appropriate
symptom.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
4
With the DRBIII
t, read the Battery Voltage under Transmission Sensors.
Start the engine.
Increase the Engine Speed to 1500 RPM.
Is the Transmission Voltage above 9.9 volts?
All
Yes
→
No
→
5
Using the when monitored / when set conditions, attempt to reset the DTC. If the
DTC can be reset return to the symptom list and perform the appropriate diagnostic
test.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
NOTE: Check the Technical Service Bulletins.
Were any problems found?
All
Yes
→
Repair the wiring and/or connectors as necessary.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
Test Complete.
6
Turn ignition off to the lock position.
Disconnect the TCM harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Connect the ground clip of a test light to a known good 12 volt source on the vehicle
such as the positive battery post.
Probe the ground circuit in the TCM connector with the test light.
NOTE: The light must illuminate brightly, if it does not light, or lights dimly,
the circuit must be repaired. If there is any doubt, compare the brightness
when testing the circuit, to the brightness when connected directly to the
battery.
Does the light illuminate brightly at all ground circuits?
All
Yes
→
No
→
Repair the open or high resistance Ground circuit.
Perform AW4 TRANS VERIFICATION TEST-VER1.
16
TRANSMISSION
P0562-TRANSMISSION VOLTAGE LOW —
Continued
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