DTC U0122: Power Control Unit Lost Communication With VSA Modulator-Control Unit (VSA Message) (2013-15)

DTC (Power Control Unit)

1. Problem verification:

   Clear the DTCs with the HDS.

   Clear DTCs

   - 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.

   DTC Description	DTC
   U0122 Power Control Unit Lost Communication With VSA Modulator-Control Unit (VSA Message)

   Is DTC U0122 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. Fuse check:

   Check the following fuse.

   Fuse	No. B24 (7.5 A)

   Location

   Under-dash fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 3.

   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):

   Press the engine start/stop button to select the OFF mode.

   - 2. Disconnect the following connector.

   VSA modulator-control unit 38P 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 38P connector: disconnected
   Test circuit	IG1 VSA/ABS
   Test point 1	VSA modulator-control unit 38P connector No. 36 (GRN)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The IG1 VSA/ABS wire is OK. Go to step 4.

   NO 

   Repair an open or high resistance in the wire.

4. Open wire check (F CAN lines):

   Press the engine start/stop button to select the OFF mode.

   - 2. Disconnect the following connector.

   Power control unit connector C (36P)

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

   Test condition	OFF modeVSA modulator-control unit 38P connector: disconnectedPower control unit connector C (36P): disconnected
   Test circuit	F CAN-H
   Test point 1	Power control unit connector C (36P) No. 21 (WHT)
   Test point 2	VSA modulator-control unit 38P connector No. 38 (WHT)

   Test circuit	F CAN-L
   Test point 1	Power control unit connector C (36P) No. 20 (RED)
   Test point 2	VSA modulator-control unit 38P connector No. 26 (RED)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The F CAN wires are OK. Replace the power control unit .

   NO 

   An open or poor connection in the F CAN wires between the VSA modulator-control unit and the power control unit.