SMU - SECTION 6E3 - DRIVEABILITY & EMISSIONS. Chevrolet Lumina 1995

SUBJECT: SERVICE MANUAL UPDATE-SECTION 6E3-DRIVEABILITY AND EMISSIONS- REVISED DIAGNOSTIC AIDS ON THE FACING PAGE OF DTC PO134 HEATED OXYGEN SENSOR (HO2S) ERROR

MODELS: 1994-95 CHEVROLET LUMINA 1994-95 OLDSMOBILE CUTLASS SUPREME 1994-95 PONTIAC GRAND PRIX WITH 3.4L ENGINE (VIN X-RPO LQ1) (SFI)

THIS BULLETIN IS BEING ISSUED TO CORRECT THE DIAGNOSTIC AIDS SECTION OF THE FACING PAGE FOR DTC P0134-HEATED OXYGEN SENSOR (HO2S) ERROR.

THE FAULTY HO2S HEATER OR HEATER CIRCUIT IS INCORRECT.

WITH THE IGNITION "ON" THE TECH 1 DISPLAYS AN HO2S VOLTAGE AT BIAS (APPROXIMATELY 450MV). THE TECH 1 DISPLAY WILL NOT CHANGE FROM THE BIAS VOLTAGE READING. WITH THE IGNITION "ON", ENGINE RUNNING, THE VEHICLE WILL REMAIN IN OPEN LOOP UNTIL THE FOLLOWING CONDITIONS ARE MET:

* ENGINE RUN TIME IS GREATER THAN 40 SECONDS. * ENGINE COOLANT TEMPERATURE IS ABOVE 43 DEGREES C (110 DEGREES F). * THROTTLE ANGLE IS GREATER THAN 3%.

FIGURES: 00 ATTACHMENTS: 00

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.