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DTC Troubleshooting: U1261 (107-21)

DTC U1261:
 F-CAN Malfunction (TCM Lost Communication with ABS/VSA Modulator-Control Unit)
NOTE: If DTC U1261 is stored at the same time as DTC U1405, troubleshoot DTC U1261 first, then recheck for DTC U1405.
  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 U1261 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 U0155 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 ABS modulator-control unit 25P connector (or the VSA modulator-control unit 36P connector).
  1. Disconnect the clutch actuator subharness 10P connector from the engine compartment wire harness.
  1. With ABS: Connect ABS modulator-control unit 25P connector terminal No. 1 (No. 17) * and body ground with jumper wires.
    With VSA: Connect VSA modulator-control unit 36P connector terminal No. 14 (No. 1) * 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 ABS (or VSA) modulator-control unit.■
  1. Turn the ignition switch to LOCK (0).
  1. Wait for at least 30 seconds.
  1. Disconnect the ABS modulator-control unit 25P connector (or the VSA modulator-control unit 36P connector).
  1. Disconnect the clutch actuator subharness 10P connector from the engine compartment wire harness.

  1. With ABS: Connect ABS modulator-control unit 25P connector terminal No. 1 (No. 17) * and body ground with jumper wires.
    With VSA: Connect VSA modulator-control unit 36P connector terminal No. 14 (No. 1) * 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 VSA modulator-control unit, then recheck. If the symptom/indication goes away with a known-good VSA modulator-control unit, replace the original VSA modulator-control unit.
NO -
Repair an open in the wire between the clutch actuator subharness 10P connector and the VSA modulator-control unit.■