Jeep Wrangler TJ. Manual — part 176
TEST
ACTION
APPLICABILITY
9
Turn the ignition off to the lock position.
Disconnect the Transmission TRS harness connector.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch
Output circuit in the TRS harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?
All
Yes
→ Go To 10
No
→ 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 TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
10
Turn ignition off to the lock position.
Remove the Backup Lamp bulb.
Disconnect the Transmission TRS harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Backup Lamp Supply circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair Backup Lamp Supply circuit for a short to ground. Check
the fuse and replace if necessary.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
No
→ Test Complete.
429
TRANSMISSION - 42RLE
*BACKUP LAMPS INOPERATIVE —
Continued
Symptom:
*CHECKING PARK/NEUTRAL SWITCH OPERATION
POSSIBLE CAUSES
P/N POSITION SWITCH SENSE CIRCUIT OPEN
P/N POSITION SWITCH SENSE CIRCUIT SHORTED TO GROUND
TRANSMISSION RANGE SENSOR
PCM - P/N POSITION SWITCH
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the Park/Neutral Position Switch input state.
While moving the gear selector through all gear positions, Park to 1 and back to Park,
watch the DRBIII
t display.
Did the DRBIII
t display show P/N and D/R in the correct gear positions?
All
Yes
→ Test Complete.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Transmission Range Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the P/N Position Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 3
No
→ Repair the P/N Position Switch Sense circuit for an open.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
3
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Transmission Range Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the P/N Position Switch Sense circuit.
Is the resistance above 100k ohms?
All
Yes
→ Go To 4
No
→ Repair the P/N Position Switch Sense circuit for a short to ground.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
430
TRANSMISSION - 42RLE
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the PCM harness connectors.
Move the Gear selector through all gear positions, from Park to 1st and back.
While moving the gear selector through each gear, measure the resistance between
ground and the P/N Position Switch Sense circuit.
Did the resistance change from above 10.0 ohms to below 10.0 ohms?
All
Yes
→ Go To 5
No
→ Replace the Transmission Range Sensor.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
5
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per the
Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
431
TRANSMISSION - 42RLE
*CHECKING PARK/NEUTRAL SWITCH OPERATION —
Continued
Symptom:
*INCORRECT TRANSMISSION FLUID LEVEL
POSSIBLE CAUSES
INCORRECT FLUID LEVEL
TEST
ACTION
APPLICABILITY
1
The transmission must be above 70 degree F. prior to checking fluid level. Adjusting
fluid level on a cold transmission will result in an overfilled transmission.
Check the transmission fluid level per the service information.
Is the fluid level OK?
All
Yes
→ Test Complete.
No
→ Adjust fluid level. Repair cause of incorrect fluid level.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
432
TRANSMISSION - 42RLE
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