DTC U0122: Power Control Unit Lost Communication With VSA Modulator-Control Unit (VSA Message)
- 1. Problem verification:
- 1. Clear the DTCs with the HDS.
- 2. Press the engine start/stop button to select the OFF mode and then the ON mode.
- 3. Wait for at least 6 seconds.
- 4. Check for DTCs with the HDS.
Is DTC U0122 indicated?
YES
Go to step2.
NO
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
- 2. Fuse check:
- 1. Check the following fuse.
Fuse No. B24 (7.5 A) Location Under-dash fuse/relay box Is the fuse OK?
YES
Go to step3.
NO
Replace the fuse. If the fuse blows again, repair a short to ground in the No. B24 (7.5 A) fuse circuit.
- 3. Open wire check (IG1_VSA/ABS line):
- 1. Press the engine start/stop button to select the OFF mode.
- 2. Disconnect the following connector.
VSA modulator-control unit 22P connector - 3. Press the engine start/stop button to select the ON mode.
- 4. Measure the voltage between test points 1 and 2.
Test condition ON modeVSA modulator-control unit 22P connector: disconnected Test circuit IG1_VSA/ABS Test point 1 VSA modulator-control unit 22P connector No. 8 (GRY) Test point 2 Body ground Is there battery voltage?
YES
The IG1_VSA/ABS wire is OK. Go to step 4.
NO
Repair an open or high Ω in the wire.
- 4. Open wire check (F_CAN lines):
- 1. Press the engine start/stop button to select the OFF mode.
- 2. Disconnect the following connector.
Keyless access control unit connector C (24P) - 3. Check for continuity between test points 1 and 2 respectively.
Test condition OFF modeVSA modulator-control unit 22P connector: discounted Keyless access control unit connector C (24P): disconnected Test circuit F_CAN-H Test point 1 Keyless access control unit connector C (24P) No. 4 (WHT) Test point 2 VSA modulator-control unit 22P connector No. 10 (WHT) Test circuit F_CAN-L Test point 1 Keyless access control unit connector C (24P) No. 5 (RED) Test point 2 VSA modulator-control unit 22P connector No. 15 (RED) Is there continuity?
YES
The F_CAN wires are OK. Replace the keyless access control unit .
NO
An open or poor connection in the F_CAN wires between the VSA modulator-control unit and the keyless access control unit.