Malibu V6-191 3.1L VIN M SFI (1997)
The PCM contains a replaceable Knock Sensor (KS) module. The KS module contains the circuitry that allows the PCM to utilize the KS signal and
diagnose the KS sensor and circuitry. If the PCM is replaced, the KS module needs to be transferred from the original PCM. If the KS module is missing
or faulty causing a continuous knock condition to be indicated, the PCM will set DTC P0325.
Information Sensors
All of the sensors and input switches can be diagnosed using a scan tool. Following is a short description of how the sensors and switches can be
diagnosed by using a scan tool. The scan tool can also be used to compare the values for a normal running engine with the engine you are diagnosing.
Password Learn Procedure
In order for a theft deterrent vehicle to run, a password is communicated between the instrument Panel Cluster (IPC) and the Powertrain Control Module
(PCM). If a PCM is replaced, the new PCM needs to learn the correct password of the vehicle. When the new PCM is installed, the EEPROM calibration
is flashed into the new PCM and the vehicle will learn the new password upon initial ignition On. If the IPC is replaced, the PCM needs to learn the new
password from the IPC. The Password learn procedure is as follows:
1. Attempt to start vehicle, then leave the ignition On. The Theft System telltale will flash for 10 minutes.
2. When the Theft System telltale stops flashing, start the vehicle. Once the vehicle is running, the password is learned.
