Engine Controls - Clear DTC's After PCM/VCM/EGR Service

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 61-65-59

Date: December, 1996

SERVICE MANUAL UPDATE

Subject:
Section 6E - Engine Controls - Clear DTCs after PCM or VCM
Replacement/Programming or EGR Valve Replacement

Models:
1997 Buick Skylark
1997 Chevrolet Cavalier, Malibu
1997 Oldsmobile Achieva, Cutlass
1997 Pontiac Grand Am, Sunfire

1995-97 Chevrolet and GMC S/T, M/L, C/K, G, P3 Models
1996-97 Oldsmobile Bravada
with 2.2L, 2.4L, 4.3L, 5.0L, 5.7L, 7.4L Engine (VINs 4, T, J, M, R, W, X - RPOs LN2, LD9, L29, L30, L31, L35, LF6)

PCM Equipped Vehicles

This bulletin is being issued to revise the 1997 GMP/97-N-2, 1997 GMP/97-J-2 and 1997 GMT/97-ST-2 Service Manuals. Make the following revisions to the EGR replacement P0404, DTC P0405, DTC P1404 and PCM EEPROM reprogramming sections of the Service Manual due to possible setting of EGR DTCs after performing these procedures.

Clear DTCs from the PCM anytime either the PCM is reprogrammed or the EGR valve is replaced, or anytime the ignition switch is turned on with the EGR valve electrical connector disconnected. This is due to the auto zeroing function of the PCM on the EGR pintle.

VCM Equipped Trucks

This bulletin updates the following Service Manuals:

1997 1997 1997
GMT/97-ST-2 GMT/97-CK-2 GMT/97-ML-2

1997 1997 1997
GMT/97-G6-2 GMT/97-P3-2 GMT/96-ST-2

1996 1996 1996
GMT/96-CK-2 GMT/96-ML-2 GMT/96-G6-2

1996 1995 1995
GMT/96-P3-2 GMT/95-ST-2 GMT/95-CK-2

1995 1995 1995
GMT/95-ML-2 GMT/95-G6-2 GMT/95-P3-2

Add the following revision to these Engine Controls sections: EGR Valve Replacement, VCM Replacement/Programming, EGR System Diagnosis, DTC P0401 and DTC P1406.

Clear any DTCs from the VCM anytime after doing VCM Replacement/programming, turning the ignition ON while the EGR valve is disconnected, or replacing the EGR valve.

Please make a note of these revisions in your Service Manual.