Park Avenue Ultra V6-3.8L SC VIN 1 (1991)
Vehicle Speed Sensor: Technical Service Bulletins
VSS - Revised Test A (Speedometer is Inaccurate)
Bulletin:
93-8-10
Date:
Jan. '93
Ref. No.:
93-77-8
Corp. Ref. No.:
208122
SUBJECT:
ELECTRICAL SYSTEMS MANUAL UPDATE - ELECTRICAL DIAGNOSIS - VEHICLE SPEED SENSOR "SPEEDOMETER IS INACCURATE"
MODELS AFFECTED:
1991-93 PARK AVENUE/ULTRA AND LESABRE MODELS
Diagnosis for Test A "SPEEDOMETER IS INACCURATE" symptom found in the above mentioned service manuals has been revised to avoid any
confusion and misdiagnosis.
The following revised text should replace the following given text for proper system diagnosis.
BUICK
1991 Park Avenue ESM, Page 78; and 1991 LeSabre ESM, Page 72, "TEST A] VEHICLE SPEED OUTPUT TEST" add the following text to the test:
^
If all measurements are correct, do Test B.
1992 Park Avenue ESM, Page 82
1992 LeSabre ESM, Page 80
1993 LeSabre/park Avenue ESM, Page 185,
"SYMPTOM/DIAGNOSIS GUIDE"
THE HEADING WHICH STATES:
^
If the Speedometer and scan tool display different speeds, replace the Instrument Cluster see 4.
SHOULD BE REPLACED WITH:
^
If the Speedometer and scan tool display different speeds, do Test A.
