Unlike the PROM, EEPROM is not replaceable. If PCM is replaced the new PCM will need to be programmed at a GM agency.
Disconnect negative battery cable. Remove PCM from vehicle. See POWERTRAIN CONTROL MODULE (PCM) . Position PCM with access cover up. Remove access cover from PCM. Using thumb and forefinger, squeeze both ends of PROM inward (outward on some models) and pull PROM up from access hole.
Note. Note reference notch locations in PROM, carrier and PCM for reassembly reference.
- Ensure new PROM has same service number as original or is correct factory upgrade. Place new PROM in PROM carrier, and position squarely over PCM PROM socket. Press on PROM carrier until PROM is firmly seated in PCM. CAUTION: Ensure reference notches in PCM and PROM are properly aligned. If PROM is installed backwards and ignition is turned on, PROM will be destroyed.
- Install PROM access cover on PCM. Install PCM in vehicle. See «POWERTRAIN CONTROL MODULE (PCM)»(ref-20456-S13171862782001010200000) . Start engine and enter diagnostics. See appropriate TESTS W/CODES article. Check for diagnostic trouble codes. See appropriate TESTS W/CODES article for code identification.
- If code(s) sets, PROM is either not fully seated in PCM or installed backward, has bent pins or is defective. If bent pins crack when trying to straighten, replace PROM. If PROM is installed backward or is defective, replace PROM.
Knock sensor is located on side of engine block in a hole exposed to engine coolant. (Scheme 6)and (Scheme 7). Disconnect negative battery cable. Drain cooling system. Disconnect wiring harness connector from knock sensor. Remove knock sensor.
Apply water base caulk to sensor threads. DO NOT use silicone tape to seal threads. Silicone tape will insulate sensor from cylinder block. Tighten KS to 14 ft. lbs. (19 N.m). To complete installation, reverse removal procedure.
