#
DTC U0100 [JA5A-EL] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME050218901231

DTC U0100 | TCM cannot receive any signals from PCM
--- | ---
DETECTION CONDITION | • If the TCM cannot receive any signals from the PCM, the TCM determines that there is a malfunction. Diagnostic support note: • This is continuous monitor (CCM). • The MIL illuminates if the TCM detects the above malfunction condition. • FREEZE FRAME DATA is available.
• The HOLD indicator light flashes.
• The DTC is stored in the TCM memory.
POSSIBLE CAUSE | • Short to ground circuit between TCM terminal 2J and PCM terminal 49 • Short to ground circuit between TCM terminal 2M and PCM terminal 50 • Open circuit in wiring harness between TCM terminal 2J and PCM terminal 49 • Open circuit in wiring harness between TCM terminal 2M and PCM terminal 50
• Short to power supply circuit between TCM terminal 2J and PCM terminal 49
• Short to power supply circuit between TCM terminal 2M and PCM terminal 50
• 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 the FREEZE FRAME DATA on repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Bulletins 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, go to the next step.
No | Go to the next step.
3 | VERIFY RELATED DTC OR STORED DTCS • Turn the ignition switch to the LOCK position then ON position (engine off). • Verify the related stored DTCs. • Is DTC U0073 for the TCM present? | Yes | Go to the appropriate DTC inspection. (See DTC U0073 [JA5A-EL])
No | Go to the next step.
4 | INSPECT POOR CONNECTION OF TCM CONNECTOR • Turn the ignition switch to the LOCK position. • Disconnect the TCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair the terminal, then go to Step 9.
No | Go to the next step.
5 | INSPECT CAN COMMUNICATION LINE FOR SHORT TO GROUND • Inspect for 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 the wiring harness, then go to Step 9.
No | Go to the next step.
6 | INSPECT CAN COMMUNICATION LINE FOR SHORT TO POWER SUPPLY • Measure the voltage between the following terminals:

  - TCM connector terminal 2J and body ground
  - TCM connector terminal 2M and body ground

• Is the voltage B+?
Yes
Repair or replace the wiring harness, then go to Step 9.
No | Go to the next step.
7 | INSPECT POOR CONNECTION OF PCM CONNECTOR • Turn the ignition switch to the LOCK position. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair the terminal, then go to Step 9.
No | Go to the next step.
8 | INSPECT CAN COMMUNICATION LINE FOR OPEN CIRCUIT • Disconnect the PCM connector. • Inspect for continuity between following terminals:

  - TCM connector terminal 2J and PCM connector terminal 49
  - TCM connector terminal 2M and PCM connector terminal 50

• Is there continuity?
Yes
Repair or replace the wiring harness, then go to the next step.
No | Go to the next step.
9 | VERIFY TROUBLESHOOTING OF DTC U0100 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from TCM memory using the WDS or equivalent. • Start the engine and warm it up completely. • Is the same DTC present? | Yes | Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION [JA5A-EL].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure" (See AFTER REPAIR PROCEDURE [JA5A-EL].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [JA5A-EL].)
No | DTC troubleshooting completed.