For 1990-2009 cars

# SMU - SECTION 6E3 - DRIVEABILITY & EMISSIONS

#### SUBJECT: SERVICE MANUAL UPDATE-SECTION 6E3-DRIVEABILITY AND EMISSIONS-REVISED DTC P0530 AND P1639

#### MODELS: 1996 BUICK PARK AVENUE 1996-97 BUICK LESABRE, RIVIERA 1996-97 CHEVROLET CAMARO 1996-97 OLDSMOBILE EIGHTY EIGHT, LSS 1996 OLDSMOBILE NINETY EIGHT 1997 OLDSMOBILE REGENCY 1996-97 PONTIAC BONNEVILLE, FIREBIRD WITH 3.8L ENGINE (VINS K, 1 - RPOS L36, L67)

THIS BULLETIN IS BEING ISSUED TO REVISE THE CIRCUIT DIAGRAM INCLUDED IN THE DIAGNOSTIC SUPPORT INFORMATION FOR DTC P0530 A/C REFRIGERANT PRESSURE SENSOR CIRCUIT AND DTC P1639 5 VOLT REFERENCE (B) CIRCUIT. MAKE THE FOLLOWING CHANGES TO THE CIRCUIT DIAGRAMS FOR DTC P0530 AND DTC P1639:

* PCM PIN C1-17 (CIRCUIT 474) SHOULD BE 5 VOLT REF B, NOT A/C REFRIGERANT PRESSURE SENSOR SIGNAL * PCM PIN C2-73 (CIRCUIT 380) SHOULD BE A/C REFRIGERANT PRESSURE SENSOR SIGNAL, NOT 5 VOLT REF B.

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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.

COPYRIGHT 1996 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.