Engine Control Module

Engine Control Module (ECM) Connector Identification:

This engine control module voltage chart is for use with a digital voltmeter to further aid in diagnosis. The voltages you get may vary due to low battery charge or other reasons, but they should be very close.

The following conditions must be before testing:

- Engine at operating temperature

- Engine idling in "Close Loop" (for "Engine Run" column)

- DLC Diagnostic terminal not grounded

- "Scan tool" not installed

- All voltages showing "Battery Position Voltage (B+)" indicates battery or charging voltage