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DTC Troubleshooting: U0155 (107-3)

DTC U0155:
 F-CAN Malfunction (TCM Lost Communication with Gauge Control Module)
  1. Turn the ignition switch to ON (II).
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0).
  1. Turn the ignition switch to ON (II).
  1. Check for DTCs with the HDS.
Is DTC U0155 indicated?
YES -
Go to Step 6 .
NO -
Intermittent failure, the system is OK at this time.■
  1. Check for DTCs with the HDS.
Are DTC U0100, U0103, and U1261 indicated?
YES -
Go to Step 7 .
NO -
Go to Step 13 .
  1. Turn the ignition switch to LOCK (0).
  1. Wait for at least 30 seconds.
  1. Disconnect the gauge control module 32P connector.
  1. Disconnect the clutch actuator subharness 10P connector from the engine compartment wire harness.
  1. Connect gauge control module 32P connector terminal No. 30 (No. 29) * and body ground with jumper wires.
    *: CANL

  1. Check for continuity between clutch actuator subharness 10P connector terminal No. 7 (No. 6) * and body ground.
    *: CANL
Is there continuity?
YES -
Remove the clutch actuator assembly, and check for change actuator subharness. If the wire harness is OK, substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM.
NO -
Repair an open in the wire between the clutch actuator subharness 10P connector and the gauge control module.■
  1. Turn the ignition switch to LOCK (0).
  1. Wait for at least 30 seconds.
  1. Disconnect the gauge control module 32P connector.
  1. Disconnect the clutch actuator subharness 10P connector from the engine compartment wire harness.

  1. Connect gauge control module 32P connector terminal No. 30 (No. 29) * and body ground with jumper wires.
    *: CANL

  1. Check for continuity between clutch actuator subharness 10P connector terminal No. 7 (No. 6) * and body ground.
    *: CANL
Is there continuity?
YES -
Substitute a known-good shift lever, then recheck. If the symptom/indication goes away with a known-good shift lever, replace the original shift lever.
NO -
Repair an open in the wire between the clutch actuator subharness 10P connector and the gauge control module.■