For 1990-2009 cars

# SMU - SECTION 6E - ENGINE CONTROLS - REVISED

#### SUBJECT: SERVICE MANUAL UPDATE-SECTION 6E-ENGINE CONTROLS- REVISED INFORMATION REGARDING DTCS P0705 AND P0706

#### MODELS: 1996 OLDSMOBILE NINETY EIGHT 1996-97 OLDSMOBILE EIGHTY EIGHT, LSS WITH U2A OR UH8 CLUSTER 1997 OLDSMOBILE REGENCY WITH UH8 CLUSTER WITH 3.8L ENGINE (VINS K, 1 - RPOS L36, L67)

THIS BULLETIN CONTAINS ADDITIONAL INFORMATION REGARDING THE DTC P0705 - TRANS RANGE SWITCH CIRCUIT AND DTC P0706 - TRANSAXLE RANGE SWITCH PERFORMANCE DIAGNOSIS IN ENGINE CONTROLS, SECTION 6E. THE PCM IN VEHICLES EQUIPPED WITH U2A OR UH8 CLUSTERS DOES NOT RECEIVE TRANSAXLE RANGE INFORMATION DIRECTLY FROM THE TRANSAXLE RANGE SWITCH. INSTEAD, TRANSAXLE RANGE INFORMATION IS RECEIVED FROM THE INSTRUMENT PANEL VIA THE UART SERIAL DATA (CKT 800). DTC P0705 OR DTC P0706 WILL SET IN 1996 AND 1997 MODEL VEHICLES EQUIPPED WITH A U2A OR UH8 CLUSTER IF THE PCM LOSES UART SERIAL DATA COMMUNICATION WITH THE INSTRUMENT PANEL. DTC P0705 OR DTC P0706 WILL ALSO SET IN 1997 VEHICLES EQUIPPED WITH A UH8 CLUSTER IF THE INSTRUMENT PANEL DETECTS AN INCORRECT PRNDL INPUT. IF DTC P0705 OR P0706 IS ENCOUNTERED IN VEHICLES EQUIPPED WITH A U2A OR UH8 CLUSTER, DO NOT USE THE DTC TABLES IN SECTION 6E. INSTEAD, USE THE "INSTRUMENT PANEL SYSTEM CHECK" IN SECTION 8A TO DIAGNOSE THE CONDITION.

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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 1997 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.