Engine Performance - Idle Fluctuation

Bulletin No.: 031/92
Issued: 12/23/92
Revised

Category
F

Applicable Model/s
1992 MX-3
(1.6L, 4 Cyl.)

Subject

IDLE FLUCTUATION

AFFECTED VINS

This bulletin applies to 1992 MX-3 M/T models with a VIN of JM1EC431*N0139355 or lower produced through June 17, 1992.

This bulletin does not apply to 1992 MX-3 M/T models with a VIN equal to or greater than JM1EC431*N0139356 and produced after June 17, 1992.

This bulletin apllies to all 1992 MX-3 A/T models produced through June 30, 1992. 1992 MX-3 models are identified by the letter N in the 10th position of the VIN.

Example:
JM1EC431*N02xxxxx (N = 1992)

DESCRIPTION

Some vehicles may experience idle fluctuation when applying an electrical load during idle or after deceleration from high rpm.

REPAIR PROCEDURE

If this condition occurs, replace the Electronic Control Unit (ECU) with a modified part. Removal and installation procedures are outlined in the applicable Workshop Manual.

PARTS INFORMATION

PART NUMBER DESCRIPTION

B66S 18 881R ECU (1.6L, 4 Cyl., M/T)

B66T 18 881R ECU (1.6L, 4 Cyl., A/T)

WARRANTY INFORMATION

(Applies to vehicles covered under warranty.)

Warranty Type Code: A
Customer Comment Code: 03
Damage Code: 99
Part No. of Main Cause: B66S 18 881R
B66T 18 881R
Operation Number: F0812XRX
Labor Hours: 0.3 Hrs.

SPECIAL INSTRUCTIONS:

The following ECU core return procedures must be followed to expedite warranty claim processing:

1) Fill out a Warranty Shipping Record form.

2) Ship the old ECU to:

MMA - Customer Support
2 Cromwell
Irvine, CA 92718
ATM: Warranty Dept.

3) Failure to ship the old ECU will result in the denial of the warranty claim.

NOTE:
The above shipping procedures are applicable only to the 1.6L W-3 ECU. Follow normal shipping procedures for all other warranty parts.