Park Neutral Position (PNP) Switch - Circuit Revised

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 61-65-56

Date: December, 1996

SERVICE MANUAL UPDATE

Subject:
Section 6E3 - Driveability and Emissions-Revised DTC P1520 Park Neutral
Position (PNP) Switch Circuit

Models:
1996 Buick Century
1996 Chevrolet Beretta, Corsica
1996 Oldsmobile Ciera

1996-97 Chevrolet and GMC S Models
with 2.2L Engine (VIN 4 - RPO LN2)

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This bulletin is being issued to revise the DTC P1520 Park Neutral Position (PNP) Switch Circuit Table in the following Service Manuals:

^ 1996 GMP/96-L-2

^ 1996 GMP/96-A-2

^ 1996 GMT/96-ST-2

^ 1997 GMT/97-ST-2

A revised copy of the diagnostic table is included. Also add the following Diagnostic:

DTC P1520 Diagnostic Aids

^ An intermittent problem may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

^ Any circuitry that is suspected as causing the intermittent concern should be thoroughly checked for the following conditions:

- Backed out terminals

- Improper mating

- Broken locks

- Improperly formed or damaged terminals

- Poor terminal to wiring connections

- Physical damage to the wiring harness

Please mark up your Service Manual with this revision.