Engine Controls - MIL ON/DTC P0301/P0305 Set

05-056

September 12, 2006

Applies To:
2005 Accord Hybrid - From VIN JHMCN36..5C000001 thru JHMCN36..5C014296

MIL Comes On With DTC P0301 and P0305

(Supersedes 05-056, dated November 29, 2005)
Updated information is shown with asterisks.

SYMPTOM

The MIL is on with DTC P0301 (No. 1 cylinder misfire) and P0305 (No. 5 cylinder misfire).

NOTE:
If this symptom occurs on a vehicle up through VIN JHMCN36..5C006600, make sure the PCM software has been updated as described in Service Bulletin 05-038, Product Update: IMA Battery Software Update. If not, do the product update, then recheck for DTCs P0301 and P0305.

PROBABLE CAUSE

The PGM-FI software may erase GKP pattern learn values (high speed) under certain conditions.* This can cause the PGM to misinterpret inputs on cylinders 1 and 5 as misfires.

First, a GST (Generic Scan Tool) PGM clear or HDS GKP pattern clear is done. If this is followed by a GKP pattern learn, then a test-drive where Idle Stop is done without turning off the ignition switch, the GKP pattern learn values may be erased.

CORRECTIVE ACTION

Use the HDS to update the PGM-FI software.





SOFTWARE INFORMATION

WARRANTY CLAIM INFORMATION

In warranty: The normal warranty applies.

Operation Number: 1255A2

Flat Rate Time: 0.3 hour

Failed Part: P/N 37820-RCJ-A56
H/C 7995269

Defect Code: 03214

Symptom Code: 03203

Skill Level: Repair Technician

Template ID: 05-056A

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

DIAGNOSIS

NOTE:
Make sure the HDS software you are using is version 1.018.016 or later. Refer to Service Bulletin 01-023, Updating Control Units/Modules, for details.

1. Connect the HDS to the 16P DLC (data link connector). Turn the ignition switch to ON (II). Turn on the HDS.

2. At the screen prompts, enter the VIN (if you're prompted) and the odometer reading.

3. From the Select Mode screen, select Honda Systems. From the System Selection Menu, select PGM-FI. Select DTC/Freeze Data.

^ If DTCs P0301 and P0305 are stored, go to step 4.

^ If DTCs P0301 and P0305 are not stored, continue with normal troubleshooting.

4. * Navigate to the PGM-FI Data List.

5. Find the data list parameter Pulser F/B Learn (high speed).

^ If the Pulser F/B Learn (high speed) indicates Completed, continue with normal troubleshooting.

^ If the Pulser F/B Learn (high speed) does not indicate Completed, go to REPAIR PROCEDURE.*

REPAIR PROCEDURE

Update the PGM-FI software using HDS version 1.018.016 or later. To update the PGM-FI software, refer to Service Bulletin 01-023, Updating Control Units/Modules.





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