U0126

Control System DTCs

DTC Troubleshooting: U0100-00, U0101-00, U0122-00, U0126-00

DTC U0100-00 : F-CAN Malfunction (Lost Communication with Powertrain Control Module (PCM))
DTC U0101-00 : F-CAN Malfunction (Lost Communication with A/T Control System)
DTC U0122-00 : F-CAN Malfunction (Lost Communication with VSA Modulator-Control Unit)
DTC U0126-00 : F-CAN Malfunction (Lost Communication with Steering Angle Sensor)

NOTE: Before you troubleshoot, review the how to troubleshoot the real time AWD system.






1. Problem verification (DTC check):

-1. Turn the ignition switch to ON (II).

-2. Clear the DTC with the HDS.

-3. Turn the ignition switch to LOCK (0).

-4. Start the engine.

-5. Check for DTCs with the HDS.






Is DTC U0100-00, U0101-00, U0122-00, or U0126-00 indicated?
-DTC U0100-00 or U0101-00 is indicated- Go to step 2.
-DTC U0122-00 is indicated- Go to step 3.
-DTC U0126-00 is indicated- Go to step 4.
-DTC is not indicated- Intermittent failure, the system is OK at this time.

2. Open wire check (F CAN-H, F CAN-L lines):

-1. Turn the ignition switch to LOCK (0).

-2. Jump the SCS line with the HDS.

-3. Disconnect the following connectors.






-4. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM Service and Repair, and recheck. If the symptom/indication goes away with the updated PCM, troubleshooting is complete. If the symptom/indication goes away with a known-good PCM, replace the original PCM Service and Repair.
-NO- Repair an open in the F CAN-H and/or F CAN-L wires between the real time AWD control unit and the PCM.

3. Open wire check (F CAN-H, F CAN-L lines):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connectors.






-3. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- Update the VSA modulator-control unit if it does not have the latest software Programming and Relearning, and recheck. If the symptom/indication goes away with the updated VSA modulator-control unit, troubleshooting is complete. If the symptom/indication goes away with the updated the VSA modulator-control unit, replace the original VSA modulator-control unit Service and Repair.
-NO- Repair an open in the F CAN-H and/or F CAN-L wires between the real time AWD control unit and the VSA modulator-control unit.

4. Open wire check (F CAN-H, F CAN-L lines):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connectors.






-3. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- Replace the steering angle sensor Steering Angle Sensor Removal And Installation.
-NO- Repair an open in the F CAN-H and/or F CAN-L wires between the real time AWD control unit and the steering angle sensor.