Engine Controls - MIL ON/Multiple Misfire DTC's Stored
04-042October 11, 2011
Applies To:
2003-04 Accord V6 � ALL
MIL Comes On With DTCs P0301 and P0305, or P0302 and P0306, and Possible P0300
(Supersedes 04-042, dated July 23, 2011, to revise the information marked by the black bars and asterisks)
REVISION SUMMARY
*Under WARRANTY CLAIM INFORMATION, a flat rate time was changed.*
SYMPTOM
The MIL is on, and DTCs P0301 and P0305, or P0302 and P0306 are set. DTC P0300 (random misfire) may also be set.
PROBABLE CAUSE
The ECM/PCM software incorrectly interprets sensor inputs, causing the codes to set.
CORRECTIVE ACTION
Retrieve the DTCs with the Honda Diagnostic System (HDS), and clear any stored codes. Update the ECM/ PCM software, and do the Crankshaft Position Sensor (CKP) learn procedures.
WARRANTY CLAIM INFORMATION
The normal warranty applies.
Failed Part: P/N 37820-RCA-A92
Defect Code: 03214
Symptom Code: 03203
Skill Level: Repair Technician
DIAGNOSIS
Confirm the MIL is on. Using the HDS, inspect the Freeze Data and/or the onboard Snapshot Data. Did DTCs P0301 and P0305, or P0302 and P0306, occur while the engine speed was over 4000 rpm?
Yes - Go to REPAIR PROCEDURE.
No - This service bulletin does not apply; continue with normal troubleshooting.
REPAIR PROCEDURE
NOTE:
^ Before you update an ECM/PCM, make sure the battery in the vehicle is fully charged.
^ To prevent ECM/PCM damage, do not operate anything electrical (audio system, brakes, A/C, power windows, moonroof, etc.) during the update.
1. Use the HDS to clear any stored codes.
2. If not already done, load the October 2004 or later iN CD onto the iN master terminal. Loading instructions are included with the CD.
3. Update the ECM/PCM software (refer to Service Bulletin 01-023, Updating Control Units/Modules).
4. Do the ECM/PCM idle learn procedure:
^ Make sure all electrical items (A/C, audio, rear window defogger, lights, etc.) are off.
^ With the HDS, do the ECM/PCM RETEST and CKP PATTERN CLEAR.
^ Turn the ignition switch to the ON (II) position for 30 seconds.
^ Start the engine, and let it warm up to its operating temperature (the cooling fans cycle twice).
^ Let the engine idle (throttle closed and all electrical items off) for 10 minutes.
5. Do the low-rpm CKP learn procedure:
^ Test-drive the vehicle on a level road. With the A/T in second gear, or the M/T in second or third gear, decelerate (with the throttle fully closed) from an engine speed of 2,500 rpm down to 1,000 rpm.
^ Stop the vehicle, and put the transmission into park or neutral. Set the parking brake. Do not turn the ignition OFF.
6. Connect the HDS to the DLC, and check the status of PULSER F/B LEARN:
^ On the Selection Menu, select PGM-FI.
^ On the Mode Menu, select Data List.
^ Check the value of PULSER F/B LEARN.
^ If the value is Completed, go to step 7.
^ If the value is Not Completed, be sure the engine is at normal operating temperature (the ECT SENSOR (1) value is 176 or higher), and repeat step 5.
7. Do the high-rpm CKP pattern learn:
NOTE:
The low-rpm CKP pattern learn must be completed before you do the high-rpm CKP pattern learn.
^ Test-drive the vehicle on a level road. With the A/T in first gear, or the M/T in first gear, decelerate (with the throttle fully closed) from an engine speed of 5,000 rpm down to 3,000 rpm.
^ Stop the vehicle, and put the transmission into park or neutral. Set the parking brake. Do not turn the ignition OFF.
8. Connect the HDS to the DLC (if not already connected), and check the status of PULSER F/B Learn (HIGH RPM):
^ On the Selection Menu, select PGM-FI.
^ On the Mode Menu, select Data List.
^ Check the value of PULSER F/B LEARN (HIGH RPM).
^ If the value is Completed, you are finished. Disconnect the HDS.
^ If the value is Not Completed, be sure the engine is at normal operating temperature (the ECT SENSOR (1) value is 176 or higher), and repeat step 7.
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