DTC P04C1

DTC P04C1  : Fuel Fill Door Open Relay Control Circuit Low Voltage

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

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

   -4. Turn the vehicle to the ON mode.

   -5. Operate the fuel fill door opener switch to open the fuel fill door, and wait a few seconds.

   -6. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P04C1 Fuel Fill Door Open Relay Control Circuit Low Voltage

   DTC (PGM-FI)

   Is DTC P04C1 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the fuel fill door open relay and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.

2. Fuse check

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

   -2. Check the No. B26 fuse .

   Is the fuse OK?

   YES 

   Go to step 3.

   NO 

   Replace the No. B26 fuse. Also check for short to ground on the No. B26 fuse circuit if needed.

3. Relay check

   -1. Remove the fuel fill door open relay .

   -2. Test the fuel fill door open relay .

   Is the fuel fill door open relay OK?

   YES 

   The fuel fill door open relay is OK. Go to step 4.

   NO 

   Replace the fuel fill door open relay.

4. Open wire check (IGPS line)

   -1. Turn the vehicle to the ON mode.

   -2. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Fuel fill door open relay: disconnected
   Test point 1	Fuel fill door open relay 4P socket (female terminals) No. 3:
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The IGPS wire is OK. Go to step 5.

   NO 

   Repair an open in the IGPS wire between the under-hood fuse/relay box and the fuel fill door open relay.

5. Open wire check (FUEL LID ACT RLY CL- line)

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

   -2. Jump the SCS line with the HDS, and wait more than 1 second.

   -3. Disconnect the following connector.

   PCM connector A (50P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (50P): disconnected
   	Fuel fill door open relay: disconnected
   Test point 1	PCM connector A (50P) No. 23
   Test point 2	Fuel fill door open relay 4P socket (female terminals) No. 4:

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

   Is there continuity?

   YES 

   The FUEL LID ACT RLY CL- wire is OK. Go to step 6.

   NO 

   Repair an open in the FUEL LID ACT RLY CL- wire between the PCM (A23) and the fuel fill door open relay.

6. Shorted wire check (FUEL LID ACT RLY CL- line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Fuel fill door open relay: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	PCM connector A (50P) No. 23
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the FUEL LID ACT RLY CL- wire between the PCM (A23) and the fuel fill door open relay.

   NO 

   The FUEL LID ACT RLY CL- wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .