PCM - MIL Illumination With DTC P0421 Set

Bulletin No.: 005/98
Issued: 05/28/98
Revised: 12/31/98

Category
F (01)

Applicable Model/s
1996-97 626/MX-6
(w/FS & A/T)

Subject
MIL ILLUMINATION W/DTC P0421

BULLETIN NOTE
^ This bulletin supersedes F005/98 dated 12/23/98. The REPAIR PROCEDURE has been revised.

APPLICABLE MODEL(S)/VINS
All 1996-97 626/MX-6 vehicles with FS engine and automatic transmission.

DESCRIPTION

The MIL may illuminate while driving with DTC P0421 stored in the Powertrain Control Module (PCM) memory. This may be caused by the PCMs sensitivity and can be affected by degraded performance of the front 3-way catalytic converter. A modified PCM calibration is available to reduce this concern.

Customers complaining of this concern should have their vehicle repaired using the following procedure.

REPAIR PROCEDURE

1. Verify customer complaint.

2. Inspect the vehicle for an Authorized Modification Label indicating that the vehicle has already been reprogrammed with the latest calibration for DTC P0421 and P1407.

If the label is present, contact the Technical Assistance Hotline.
If the label is not present, proceed to Step 3.

3. Use the flowchart on to reprogram the PCM and monitor the O2 sensor fluctuation to determine the condition of the front catalytic converter.








FLOWCHART OF REPAIR PROCEDURE - MIL ILLUMINATION WITH DTC P0421





PART(S) INFORMATION





WARRANTY INFORMATION

Note
^ This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.

^ If catalytic converter and/or PCM is replaced, claim as related parts.