MIL ON - P0304 and/or P0306 Codes

99-066

August 24, 1999

Applies To:
1998-99 Accord V6 - ALL

MIL Comes On With DTC P0304 and/or DTC P0306 Stored

SYMPTOM
MIL comes on with DTC P0304 and/or DTC P0306 stored in the Powertrain Control Module (PCM).

PROBABLE CAUSE
The PCM may be detecting a false misfire.

CORRECTIVE ACTION
Perform the diagnosis procedure in this bulletin, and if needed, replace the PCM with an updated part.

PARTS INFORMATION
PCM (California emissions cars):
P/N 37820-P8C-L52, H/C 6268213

PCM (49-state emissions cars):
P/N 37820-P8C-A52, H/C 6268205

WARRANTY CLAIM INFORMATION





In warranty: The normal warranty applies.

Failed part: P/N 37820-P8C-L51
H/C 5436191
Defect code: 072
Contention code: C99
Skill level: Repair Technician

Out of warranty: Any repair performed after warranty expiration may be eligible for goodwill consideration by the District Service Manager or your Zone Office. You must request consideration, and get a decision, before starting work.

DIAGNOSIS

1. Using the PGM Tester, clear the DTC(s) by choosing DTC/DATA CLEAR in the PGM-FI TEST MENU screen.

NOTE: Do not clear the DTC(s) by choosing ECM RESET in the PGM-FI TEST MENU screen or by pulling the PCM fuse. These methods would erase the PCM's long-term memory and abort the diagnosis procedure.

2. With the transmission in Park, rev the engine until engine speed is above 4,500 RPM. Slowly release the throttle until it falls to 4,500 RPM. Hold it there for one minute.

Does the MIL come on with DTC P0304 and/or DTC P0306 stored?

YES - Reset the PCM by choosing ECM RESET in the PGM-FI TEST MENU, then go to step 3.

NO - Disregard this service bulletin, and follow normal troubleshooting procedures.

3. With the transmission in Park, rev the engine until engine speed is above 4,500 RPM. Slowly release the throttle until it falls to 4,500 RPM. Hold it there for one minute.

Does the MIL come on with DTC P0304 and/or DTC P0306 stored?

YES - Disregard this service bulletin, and follow normal troubleshooting procedures.

NO - Go to CORRECTIVE ACTION.

CORRECTIVE ACTION
Replace the PCM with the appropriate part listed under PARTS INFORMATION. Follow the procedure on page 11-4 of the 1998-00 Accord L4 Service Manual.





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