DTC U0100: Power control unit lost communication with PCM

DTC (Power Control Unit)

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .

1. Problem verification:

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTCs with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   - 4. Wait for at least 6 seconds.

   - 5. Check for DTCs with the HDS.

   DTC Description	DTC
   U0100 Power control unit lost communication with PCM

   Is DTC U0100 indicated?

   YES 

   Go to step 2.

   NO 

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

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

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Jump the SCS line with the HDS.

   SCS short

   - 3. Disconnect the following connectors.

   PCM connector A (51P)

   Keyless access control unit connector C (20P)

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

   Test condition	Vehicle OFF (LOCK) mode Electric steering lock 12P connector: disconnected Keyless access control unit connector C (20P): disconnected
   Test point 1	Keyless access control unit connector C (20P) No. 12
   Test point 2	PCM connector A (51P) No. 1

   Test point 1	Keyless access control unit connector C (20P) No. 2
   Test point 2	PCM connector A (51P) No. 2

   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 wire(s).