Engine Controls - Manual Update Revised DTC 26 Chart

Group Ref.: Engine Fuel & Emission
Bulletin No.: 316506
Date: January, 1994

SERVICE MANUAL UPDATE

SUBJECT:
SECTION 6E3 - DRIVEABILITY AND EMISSIONS - REVISED DTC 26 CHART

MODELS:
1993 OLDSMOBILE NINETY EIGHT AND EIGHTY EIGHT
1993 PONTIAC BONNEVILLE WITH 3800 (VIN 1-RPO L67 AND VIN L-RPO L27) ENGINES

THIS BULLETIN HAS BEEN REVISED TO CHANGE PONTIAC BONNEVILLE INFORMATION. PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE:

DIVISION BULLETIN #

OLDSMOBILE 93-U-49

GM CANADA 93-6E-619

PONTIAC 93-6-39

This bulletin replaces the DTC 26 Diagnostic Chart (Pages 2 of 3 and 3 of 3) in Section 6E3, "Driveability and Emissions". The revised charts address the possibility of a faulty hot light circuit or cluster causing DTC 26 to set. Note that vehicles not equipped with a hot light (UB3, U2A, or UB7 clusters) have a resistor installed in the cluster to pull up the QDM driver circuit and simulate a hot light bulb; thus a faulty gage cluster may cause DTC 26 to set.

To check the resistor, disconnect cluster connector(s). Check resistance between the following cluster connector pins:

- Oldsmobile with UB7 or U2A Cluster - Measure resistance between connector C2 pins "Al6" and "B16" - should measure around 3.6k ohms. If not, replace cluster.

- Pontiac - The revised charts address the possibility of a faulty hot light circuit causing DTC 26 to set.








DIAGNOSTIC TROUBLE CODE 26 CHARTS