Engine System Identification

Transmission Identification 4L80-E:

Engine VIN Code ID [1] Z

Engine Displacement 4.3L (262 cid)

Engine Configuration V6

Fuel Control System Throttle Body Fuel Injection (TBI)

Ignition System Distributor Ignition W/Ignition Control and Knock Sensor(DI-IC-KS)

Computer System [2a] Powertrain Control Module (93PCM6)

Computer System [2b] Powertrain Control Module (91PCM6)

Computer System [2c] Engine Control Module (ECM/GMCM)

Remarks:

[1] The eighth digit of the VIN denotes engine code.

[2] Transmission application determines computer system.

a. If vehicle is under GVW 8500 Lbs. and is equipped with a 4L60-E
automatic transmission it has a 93PCM6 computer.

b. If vehicle is over GVW 8501 Lbs. and is equipped with a 4L80-E
automatic transmission it has a 91PCM6 computer.

c. If vehicle is equipped with manual transmission it has a
(ECM/GMCM) computer.