Engine Controls - Pin Voltage Charts: Testing

ECM circuits are checked at ECM connector with ignition off, with ignition on and engine off, and/or with ignition on and engine running. See Fig 1 -Fig 3 . Test between indicated terminal and a good body ground. When testing pin voltage, carefully backprobe terminal at harness side of ECM connector.
If voltage is not as specified, test, repair or replace circuit or affected component. Retest circuit to verify repair has been made. Unless stated otherwise, perform all tests with ECM harness connected.

Fig 1: Identifying ECM Connector Terminals

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Fig 2: Identifying ECM Connector Terminals & Circuits (1 Of 2)

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Fig 3: Identifying ECM Connector Terminals & Circuits (2 Of 2)

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