Engine Controls - MIL ON/DTC P0420 Is Stored

03-063

October 11, 2011

Applies To:
2003 Accord L4 except SULEV - All

2003 Accord L4: MIL Comes On With DTC P0420

(Supersedes 03-063, dated July 23, 2011, to update the information marked by the black bars)

REVISION SUMMARY

*Under WARRANTY CLAIM INFORMATION, a flat rate time was changed.*

SYMPTOM

The MIL is on and DTC P0420 (catalyst system efficiency below threshold) is set.

PROBABLE CAUSE

The ECM/PCM may incorrectly interpret sensor inputs and set DTC P0420.

CORRECTIVE ACTION

Update the ECM/PCM software.

WARRANTY CLAIM INFORMATION





The normal warranty applies.

Failed Part: P/N 37820-RAA-A54

Defect Code: 072

Contention Code: B03

Skill Level: Repair Technician

REPAIR PROCEDURE

1. Use the HDS to clear DTC P0420.

2. Make sure you have the iN CD (September '03 or later) loaded into your iN master terminal. If not, load the CD using the instructions that come with it.

3. Update the ECM/PCM software with the Honda Interface Module (HIM). Refer to S/B 01-023, Using the Honda Interface Module to Update Control Units/Modules.





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