DTC U0100: Power Control Unit Lost Communication With PCM (Keyless Access Power Control Unit)

DTC (Power Control Unit)

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.

   DTC Description	DTC
   U0100 Power Control Unit Lost Communication With PCM

   Is DTC U0100 indicated?

   YES 

   Go to step 2 below.

   NO 

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

2. Open wire check (F CAN lines)

   -1. Press the engine start/stop button to select the OFF mode.

   - 2. Jump the SCS line with the HDS.

   SCS short

   - 3. Disconnect the following connectors.

   PCM connector A (51P) - Refer to: How to Troubleshoot the Fuel and Emissions Systems (V6), or How to Troubleshoot the Fuel and Emissions Systems (L4), or How to Troubleshoot the A/T System (A/T) (2013-15), or How to Troubleshoot the CVT System (CVT) (2013-15), or How to Troubleshoot the A/T System (A/T) (2016-17), or How to Troubleshoot the CVT System (CVT) (2016-17)

   Keyless access control unit connector C (24P)

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

   K24W1 engine 

   Test condition	OFF mode PCM connector A (51P) : disconnected 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	PCM connector A (51P) No. 2 (WHT)

   Test circuit	F CAN-L
   Test point 1	Keyless access control unit connector C (24P) No. 5 (RED)
   Test point 2	PCM connector A (51P) No. 1 (RED)

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

   J35Y1, J35Y2 engines 

   Test condition	OFF mode PCM connector A (51P) : disconnected 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	PCM connector A (51P) No. 9 (WHT)

   Test circuit	F CAN-L
   Test point 1	Keyless access control unit connector C (24P) No. 5 (RED)
   Test point 2	PCM connector A (51P) No. 10 (RED)

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

   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.