Electra V6-231 3.8L VIN C SFI (1988)
Tachometer: Technical Service Bulletins
Instruments - Updated Tach, Gages & Digital Clusters
Bulletin 89-3-22A
Date Feb. '90
Ref. No. 89-198A-8
Corp. Ref. No. 908106R
SUBJECT:
SERVICE MANUAL UPDATE - SECTION 8A TACHOMETER, GAGES AND DIGITAL CLUSTERS
1989 ELECTRICAL SYSTEMS MANUAL (ESM) UPDATE, GAGES (UB3) AND DIGITAL U52) CLUSTERS
MODELS AFFECTED:
1987-89 LESABRE AND ELECTRA/PARK AVENUE
THIS BULLETIN IS BEING REVISED TO ADD ADDITIONAL PAGES AND TO UPDATE ILLUSTRATIONS. PLEASE DISCARD BUICK
BULLETIN 89-8-22.
TACHOMETER DIAGNOSIS
The following procedures should be used to accurately diagnose an inoperative Tachometer.
The written procedures are for use with the 1987 through 1989 Service Manuals, Section 8A.
The illustrated procedures can be cut out and taped into the appropriate position in the 1989 Electrical Systems Manual (ESM).
1987-1988 SERVICE MANUALS
Section 8A-81, Gages Cluster
Use this procedure when a J 33431 tester is not available:
1.
Disconnect Computer Controlled Coil Ignition Module connector which contains tachometer wire (circuit 121); see appropriate schematic.
