INERMITTENT Pcm Lockup When Pcm Reprogramming (99-06-04-028)

INERMITTENT PCM LOCKUP WHEN PCM REPROGRAMMING

TECHNICAL SERVICE BULLETIN

INTERMITTENT PCM LOCKUP WHEN PERFORMING ON-VEHICLE PCM REPROGRAMMING

Model(s): 1999 Chevrolet Venture

1999 Oldsmobile Silhouette

1999 Pontiac Montana

Section: 06 - Engine/Propulsion System

Bulletin No.: 99-06-04-028

Date: September, 1999

CONDITION

When performing an on-vehicle PCM reprogramming, a PCM lockup may occur.

The Pass Key III module may intermittently "wake up" during PCM programming and cause interference on the class II data line.

To prevent a lockup from occurring, remove the PASS Key fuse using the following procedure. See Fig 1 .

1. Locate the passenger compartment fuse center (1). See Fig 1 .
2. Remove the 10 amp PASS Key fuse from the instrument panel fuse center before attempting on vehicle PCM reprogramming (2). See Fig 1 .
3. After PCM programming is completed, reinstall the 10 amp PASS Key fuse (2). See Fig 1 .

This will prevent the Pass Key III module from interrupting the class II data line during the programming procedure.

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

Labor Operation	Description	Labor Time
J6355	PROM - Reprogramming - On Car	Use Published Labor Time