SMU - SECTION 6E3 - DRIVEABILITY & EMISSIONS. Pontiac Grand Am 1993

SUBJECT: SERVICE MANUAL UPDATE-SECTION 6E3-DRIVEABILITY AND EMISSIONS-REVISED DTC 22 CHART

MODELS: 1992-93 BUICK SKYLARK 1992-93 OLDSMOBILE ACHIEVA 1992-93 PONTIAC GRAND AM WITH 3.3L ENGINE (VIN N - RPO LG7)

THIS BULLETIN UPDATES THE DTC 22 CHART ON PAGE A-45 IN SECTION 6E3, DRIVEABILITY AND EMISSIONS. THE 5 VOLT REFERENCE CIRCUIT 416 AT PCM TERMINAL "BA4" AND THE 5 VOLT REFERENCE CIRCUIT 416 AT PCM TERMINAL "BA5" ARE INTERNALLY CONNECTED WITHIN THE PCM. IF A GROUNDED 5 VOLT REFERENCE CIRCUIT CONDITION EXISTS AT EITHER PCM TERMINAL "BA4" OR "BA5", CODE 22 MAY SET. BEFORE REPLACING THE PCM, CHECK FOR THE FOLLOWING CONDITIONS:

* CIRCUIT 416 BETWEEN PCM TERMINAL "BA5" AND THE A/C REFRIGERANT PRESSURE SENSOR FOR A SHORT TO CHASSIS GROUND OR ENGINE GROUND. * CIRCUIT 416 (PCM TERMINAL "BA5") FOR A SHORT TO THE SENSOR GROUND CIRCUIT 452 (PCM TERMINAL "BB6"). * DISCONNECT THE A/C REFRIGERANT PRESSURE SENSOR AND RETEST. IF THE CODE 22 CONDITION DOES NOT EXIST WITH THE A/C REFRIGERANT PRESSURE SENSOR DISCONNECTED, REPLACE THE A/C REFRIGERANT PRESSURE SENSOR.

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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.