DTC U0100: Power Control Unit Lost Communication With PCM

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 ChecksBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not CommunicatingBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFFBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON .

• 1. Problem verification:

  1. Clear the DTCs with the HDS.

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

  3. Wait for at least 6 seconds.

  4. 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, and wait more than 1 minute.

  3. Disconnect the following connectors.

  Keyless access control unit connector C (24P) PCM connector A (51P)

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

  Test condition	Vehicle OFF (LOCK) mode PCM connector A (51P): disconnected Keyless access control unit connector C (24P): disconnected
  Test point 1	Keyless access control unit connector C (24P) No. 4
  Test point 2	PCM Connector A (51P) No. 2

  Test point 1	Keyless access control unit connector C (24P) No. 5
  Test point 2	PCM Connector A (51P) No. 1

  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 PCM and the keyless access control unit.