EXPERTEC TSB (57-65-09)

Publication date: 1995-06-06
Reference number: 57-65-09

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

Reference Number(s): 57-65-09, Date of Issue: 06/06/95

DIAGNOSTIC TROUBLE CODE 32 - WHILE UNDER HEAVY LOAD

Model(s): 1994-95 Chevrolet and GMC Truck C/K, G and P Models with 7.4L Engine (VIN N - RPO L19)

Bulletin No.: Chevrolet 57-65-09, GMC 57-65-09

Date: 06/06/1995

CONDITION

SOME OWNERS MAY COMMENT OF A CEL WHILE UNDER A HEAVY LOAD SUCH AS TOWING. THE ECM WILL HAVE A STORED DTC 32.

CAUSE

UNDER CERTAIN DRIVING CONDITIONS, USUALLY WHILE TOWING, THE EGR IS COMMANDED TO CYCLE OFF AND ON RAPIDLY. THIS CAN CAUSE THE EGR TO APPEAR UNRESPONSIVE TO ECM.

CORRECTION

THE CALIBRATION HAS BEEN CHANGED TO BECOME MORE ROBUST WITH RESPECT TO THE CONDITIONS CAUSING THE EGR TO RAPIDLY CYCLE. INSTALL THE APPROPRIATE MEM-CAL FROM THE CHARTS BELOW:

Fig 1: 1994 MODEL YEAR MEM-CAL TABLE

Fig 2: 1995 MODEL YEAR MEM-CAL TABLE

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

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