Engine Controls - Pin Voltage Charts: Introduction
Pin voltage charts are supplied to reduce diagnostic time. Checking pin voltages at the Powertrain Control Module (PCM) determines whether it's receiving and transmitting proper voltage signals. Charts may also help determine if PCM harness has a shorted or open circuit.
NOTE:
Perform voltage tests using EEC-IV Monitor (007-0047D) and Recorder (007-00021) or a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Perform all resistance checks with battery power removed from the circuit unless stated otherwise.
CAUTION:
When battery is disconnected, vehicle computer and memory systems 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.