DTC - 32 (REPLACE MEM-CAL). GMC Truck GMC Suburban

********************************************************************* SUBJECT: DTC 32 (REPLACE MEM-CAL)

MODELS: 1994 CHEVROLET AND GMC C1500 TRUCKS WITH 4.3L ENGINES (VIN Z - RPO LB4) AND NB6 EMISSIONS (TIER 1)

CONDITION:

SOME OWNERS MAY REPORT A DIAGNOSTIC TROUBLE CODE (DTC) 32 (EXHAUST GAS RECIRCULATION--EGR--VALVE FAULT).

CORRECTION:

IF INSPECTION AND TESTING OF THE EGR SYSTEM REVEALS NO CAUSE OF THE DTC 32, THE CONDITION MAY BE CORRECTED BY INSTALLING THE CALIBRATION LISTED BELOW.

NOTE: NB6 TIER 1 EMISSION VEHICLES ARE SOLD IN CALIFORNIA AND NEW YORK STATE FOR THE 1994 MODEL YEAR. ALL AFFECTED VEHICLES ARE C1500 AUTOMATIC TRANSMISSION #5600 GVW (C5G OPTION CODE).

PARTS INFORMATION:

MEM-CAL: NB6 EMISSIONS ONLY SERVICE B/C SCAN OLD B/C VEHICLE TRANS. AXLE MEM-CAL KIT CODE I.D. CODE ------- ------ ---- ----------- ---- ---- ------- C1500 M30 GU4 (3.08) 16204004 BKZM 4005 BJAY GU6 (3.42)

PARTS ARE EXPECTED TO BE AVAILABLE FROM GMSPO ON JANUARY 10, 1994.

WARRANTY INFORMATION:

LABOR OPERATION: T0500 - PROM, ECM--REPLACE LABOR TIME: 0.6 HOUR

FIGURES: 0

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.