For 1990-2009 cars

# SERVICE MANUAL UPDATE - SEC. 6E3 DRIVEABILITY & EMISSIONS

---------------------------------------------------------------------- REVISION 12/23/93

THIS BULLETIN HAS BEEN REVISED TO CHANGE PONTIAC BONNEVILLE INFORMATION. PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE: PONTIAC 93-6-39 GM OF CANADA 93-6E-619 ----------------------------------------------------------------------

#### SUBJECT: SERVICE MANUAL UPDATE - SECTION 6E3 - DRIVEABILITY AND EMISSIONS - REVISED DTC 26 CHART

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

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 "A16" 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.

FIGURES: 2

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.

COPYRIGHT 1993 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.