Silhouette V6-3.4L VIN E (1996)
Engine Control Module: Customer Interest
PCM - No Communication With OBD II Scan Tool
File In Section: 6E - Engine Fuel & Emission
Bulletin No.: 67-65-27
Date: August, 1996
Subject:
Non-GM SAE J1978 OBD II Scan Tool Does Not Communicate with the PCM (Flash with New Calibration)
Models:
1996
Buick Century, LeSabre, Park Avenue, Park Avenue Ultra, Regal, Riviera, Skylark
1997
Buick LeSabre
1996
Chevrolet Beretta, Corsica, Lumina, Lumina APV, Monte Carlo
1996
Oldsmobile Achieva, Cutlass Ciera, Cutlass Supreme, Eighty Eight, LSS, Ninety Eight, Silhouette
1996
Pontiac Bonneville, Grand Am, Grand Prix, Trans Sport
with 3.1 L, 3.4L, 3.8L Engines (VINs 1, E, K, M, X - RPOs L67, LA1, L36, L82, LQ1)
Condition
Some non-GM SAE J1978 OBD II Scan Tools may not communicate with the Powertrain Control Module (PCM) when in Current, Freeze Frame, or
Test Parameters & Results mode. Other scan tool modes including OBD II DTCs (Diagnostic Trouble Codes) are not affected.
Cause
PCM software/calibration anomaly prevents some non-GM scan tools from communicating with the PCM.
Correction
Flash the PCM with new software/calibration. The new software/calibrations are available beginning with the 1996 CD number 12 from GM Service
Technology Group.
Important:
There are three methods for programming a PCM:
1.
Direct programming. The vehicle is directly connected via the Data Link Connector (DLC) to the dealer's Techline equipment. (T-20 Plus, T-50
and T-60 only) Vehicle must be present.
2.
Remote programming. The new program is downloaded into the dealer's scan tool and then downloaded into the vehicle from the scan tool via the
DLC. (Tech 2 required for 1997 Model Year) Vehicle must be present.
3.
Off-car programming. A PCM may be programmed while removed from the vehicle by using the Off-board Programming Adapter (OBPA), P/N J
41207-B. This adapter can be connected to either the Techline terminal for direct programming or to the scan tool for remote programming. (Do
not use Tech 2 with OBPA at this time.) Not necessary for the vehicle to be present.
Refer to the appropriate Service Manual or Techline Information for more detailed instructions.
Important:
Do not attempt to order the software/calibrations from GMSPO. They are programmed into the vehicle's PCM via a Techline Tool Device.
Parts Information