Pin Voltage Tests
NOTE:
When performing pin voltage tests, unless stated otherwise in testing procedures, perform all pin voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Voltage readings may vary slightly due to battery condition or charging rate.
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 the COMPUTER RELEARN PROCEDURES
article in the GENERAL INFORMATION section before disconnecting battery.
CAUTION:
When performing pin voltage tests, ensure proper terminals are used. Failure to use proper terminals may result in damage to wiring, ECM or sensor.
- Engine Control Module (ECM) is located below instrument panel, just in front of center console. See Fig 1 . Ensure ignition is off. Remove ECM for access to connectors on ECM (if necessary). Note ECM connector terminal identification. See Fig 2 .
- Connect paper clip or fine probe on leads of DVOM. Using DVOM, backprobe specified terminals to check voltage between ground and specified terminals in proper check condition. See Figure -7.
- If voltage is not within specification, check corresponding sensor, actuator and related wiring. After performing repair or replacement, recheck to ensure problem is corrected.