PROM - Service Enging Soon Light, False Code 45

Number: 92-345-6E

Section: 6E

Date: MARCH 1993

Corporate Bulletin No.: 376501

ASE No.: A1, A8

Subject:
SERVICE ENGINE SOON LIGHT - FALSE CODE 45

Model and Year:
1992 CAPRICE WITH 4.3L ENGINE (VIN Z - RPO LB4)

ENGINE APPLICATIONS: 4.3L (LB4)

ENGINE VIN: Z

SUBJECT:
Service Engine Soon Light - False Code 45

VEHICLE APPLICATIONS:
1992 Model Year B Cars

CONDITION:

Some owners of 1992 model year B cars with 4.3L (RPO LB4) engines may comment on a service engine soon light-Code 45 - oxygen sensor (02) rich. The vehicle does not exhibit any driveability symptoms.

CAUSE:

The original calibration sets a false code 45.

CORRECTION:

1. Perform the normal diagnostics per section 6E of the service manual.

2. If no problems are found using these diagnostic procedures replace the PROM (programmable read only memory) with the following GMSPO part:

Broadcast Scanner
GMSPO P/N Code I.D.

16191686 BFKF 1711

Parts are expected to be available on March 8, 1993.

WARRANTY INFORMATION:

Labor Operation: T0500

Labor Time: 0.5 hour