DTC U0101 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010290000W02

DTC U0101

PCM cannot receive any signals from TCM

DETECTION CONDITION

• PCM cannot receive any signals from TCM.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
• PENDING CODE is available if the PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Short to ground circuit between TCM terminal 2J and PCM terminal 66
• Short to ground circuit between TCM terminal 2M and PCM terminal 92
• Open circuit between TCM terminal 2J and PCM terminal 66
• Open circuit between TCM terminal 2M and PCM terminal 92
• Short to power circuit between TCM terminal 2J and PCM terminal 66
• Short to power circuit between TCM terminal 2M and PCM terminal 92
• Damaged TCM
• Damaged PCM

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related Service Information and/or on-line repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnostic according to the available repair information.
• If the vehicle is not repaired, then go to the next step.
No
Go to the next step.
3
VERIFY RELATED PENDING CODE OR STORED DTCS
• Turn the ignition switch off then to the ON position (Engine off).
• Verify related pending code or stored DTCs.
• Is DTC U0073 for TCM present?
Yes
Go to appropriate DTC inspection.
No
Go to the next step.
4
INSPECT POOR CONNECTION OF TCM CONNECTOR
• Turn the ignition switch off.
• Disconnect TCM connector.
• Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Is there any malfunction?
Yes
Repair terminal, then go to Step 9.
No
Go to the next step.
5
CHECK CAN COMMUNICATION LINE FOR SHORT TO GROUND
• Check continuity between following terminals:
- TCM connector terminal 2J and body ground
- TCM connector terminal 2M and body ground
• Is there continuity?
Yes
Repair or replace wiring harness, then go to Step 9.
No
Go to the next step.
6
CHECK CAN COMMUNICATION LINE FOR SHORT TO POWER
• Measure voltage between following terminals:
- TCM connector terminal 2J and body ground
- TCM connector terminal 2M and body ground
• Is voltage B+?
Yes
Repair or replace wiring harness, then go to Step 9.
No
Go to the next step.
7
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn the ignition switch off.
• Disconnect PCM connector.
• Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Is there any malfunction?
Yes
Repair terminal, then go to Step 9.
No
Go to the next step.
8
CHECK CAN COMMUNICATION LINE FOR OPEN
• Disconnect PCM connector.
• Check continuity between following terminals:
- TCM connector terminal 2J and PCM connector terminal 66
- TCM connector terminal 2M and PCM connector terminal 92
• Is there continuity?
Yes
Repair or replace wiring harness, then go to Step 9.
No
Go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC U0101 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Start engine and warm it up completely.
• Is same PENDING code for this DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.