Test A: No Communication With Powertrain Control Module
CAUTION:
When battery is disconnected, vehicle computer and memory system may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.
- Turn ignition off. Disconnect Powertrain Control Module (PCM) harness connector C175a. Turn ignition on. Measure voltage between PCM harness connector C175a terminal No. 32 (Green/Yellow wire) and ground. Measure voltage between PCM harness connector C175a terminal and No. 33 (Green/Orange) wire and ground. See Fig 1 . If voltages are greater than 10 volts, go to next step. If voltages are less than 10 volts, repair open or short in Green/Yellow and/or Green/Orange wires as necessary.
- Turn ignition off. Measure resistance between ground and PCM harness connector C175a terminals No. 24 (Black/Yellow wire), 25 (Black/Red wire), 26 (Black/Red wire), 27 (Black/Red wire) and 43 (Brown/Yellow wire). If resistances are less than 5 ohms, repair module communication concern. If any resistance is greater than 5 ohms, repair open in wires as necessary.