SW1 L4-1.9L SOHC VIN 8 (1996)
Engine Control Module: All Technical Service Bulletins
ECM - Crankshaft Learned On Replacement PCMs Set to No
BULLETIN NO.: 96-T-39
ISSUE DATE: June, 1996
GROUP/SEQ. NO.: Engine-10
CORPORATION NO.: 686003
SUBJECT:
Service Information on Resetting Crankshaft Adaptives and Performing Crankshaft Position Relearn Procedure
MODELS AFFECTED:
1996 Saturns
PURPOSE:
Service powertrain control modules (PCMs) are shipped with the "Crankshaft Learned" parameter set to "NO." This will cause the Service (Wrench)
telltale to flash after installation of the PCM into the vehicle. The Service (Wrench) telltale flashes to remind the service technician to perform the
"Crankshaft Learning Procedure" found in the "1996 Revised Powertrain Controls Service Manual" and this bulletin. After performing the "Crankshaft
Learning Procedure," the PCM will set the "Crankshaft Learned" parameter to "YES" and the Service (Wrench) telltale will stop flashing.
When a crankshaft position (CKP) sensor, crankshaft or engine assembly have been replaced, or when a PCM is removed from one vehicle and installed
in another vehicle, or when diagnostic procedures require crankshaft re-learning, the "Crankshaft Adaptives Reset Procedure"in this bulletin must first be
performed. The "Crankshaft Adaptives Reset Procedure" resets the PCM "Crankshaft Learned" parameter to "NO," causing the Service (Wrench) telltale
to flash. The "Crankshaft Learned" parameter must be set to "NO," before the "Crankshaft Learning Procedure" can be performed.
PROCEDURES
Crankshaft Adaptives Reset Procedure (Using the Service Stall System):
IMPORTANT:
This procedure is required prior to performing the "Crankshaft Learning Procedure" unless a new PCM has been installed.
^
Key On, Engine Off
^
Identify the Vehicle
^
Select Dynamic Display (# 3) from the Main Menu
^
Select View Serial Data (# 1)
^
Select PCM/EC (# 1)
^
Select Vehicle ID Table (# 2)
^
Press F7 to select Reset Adaptives (bottom of screen)
^
Select Reset Crankshaft Adaptives (# 2)