Riviera V6-3.8L SC VIN 1 (1995)
PROM
Service of Powertrain Control Module (PCM) should normally consist of either replacement of the PCM or a PROM change. If the diagnostic
procedures call for the PCM to be replaced, the engine "calibrator" (PROM) and PCM should be checked first to see if they are the correct parts.
If they are, remove the PROM from the faulty PCM and install it in the new service PCM.
NOTE:
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The service PCM will not contain a PROM. DTC P1623 indicates the PROM is installed improperly or has malfunctioned.When DTC P1623 is
encountered, check the PCM installation for bent pins or pins not fully seated in the socket. If it is installed correctly and DTC P1623 still sets,
replace the PROM
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When replacing the production PCM with a service PCM (controller), it is important to transfer the broadcast code and production PCM number
to the service PCM label. Please do not record on PCM cover. This will allow positive identification of PCM parts throughout the service life of
the vehicle.
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The PROM is "keyed" to prohibit improper insertion. However, it is essential that the correct PROM be used with a specific vehicle model.
CAUTION:
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To prevent possible Electrostatic Discharge damage to the PCM or PROM, Do not touch the component leads, and Do Not remove integrated
circuit from carrier.
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To prevent internal PCM damage, the ignition must be "OFF" when disconnecting or reconnecting power to PCM (for example, battery cable,
PCM pigtail, PCM fuse, jumper cables, etc.).
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The ignition should always be "OFF" when installing or removing the PCM connectors.
REMOVE OR DISCONNECT
1. Negative battery cable.
2. Right sound insulator.
3. Pull bottom of PCM away from mounting bracket and remove PCM from bracket.
4. Harness connectors from PCM.
5. PCM from vehicle.
6. PROM access cover.
7. Remove PROM by using thumb and first finger. Gently squeeze each end of the blue calibrator unit and pull upward.
INSTALL OR CONNECT
1. Old or new PROM in PCM.
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Gently press on PROM until it is firmly seated in the socket.
2. PROM access cover.
3. Connectors to PCM.
4. PCM into mounting bracket.
5. Right sound insulator.
6. Negative battery cable.
FUNCTIONAL CHECK
1. Start engine and run for one minute.
2. Scan for DTCs using the Tech 1. If DTC P0325, P1361, P1350 or P1623 occurs, or if the Malfunction Indicator Lamp (Service Engine Soon) is
"ON" constantly with no diagnostic trouble codes, the PROM is not fully seated or is defective.
