Component Locations
The following conditions must be met before testing:
- Engine at operating temperature
- Engine in "closed loop" operation
- Engine idling ("Engine Run" column)
- ALDL "test" terminal NOT grounded
- "Scan" tester or ALDL tool NOT installed
NOTE:
This ECM voltage chart can be used with a digital voltmeter to help save time in diagnosis. Voltages on vehicle being tested may vary slightly from these due to battery or alternator charging level.