Engine Controls - Improved Diagnosis of Code 24 (VSS)

9226buick03

Bulletin: 90-6E-9

Date: Mar. '90

Ref. No.: 90-087-6E

Corp. Ref. No.: 016508


SUBJECT:
SERVICE MANUAL UPDATE - SECTION 6E1-DRIVEABILITY AND EMISSIONS (INFORMATION FOR COMPONENTS SETTING CODE 24)

MODELS AFFECTED:
1988 - 90 ESTATE WAGONS


This bulletin applies to Section 6E1 "Driveability And Emissions" of 1988, 1989 and 1990 Buick Estate Wagon Service Manuals.

This bulletin serves to improve diagnosing Code 24 (Vehicle Speed Sensor). If a Code 24 problem is still present after completion of the trouble code chart, then the following Diagnostic Aid should be checked. The timer module should be disconnected and then note if the fault is resolved. A short in the previously mentioned module or wires common with Circuit 437 can set a Code 24. Refer to Section BA, Page 33-0 for more information on this circuit and vehicle speed sensor.

Please update your Service Manuals accordingly.