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ECM Terminal Identification

The following conditions must be present before testing pin voltages:

Engine at normal operating temperature.
Engine idling in closed loop (ENGINE RUN column).
ALDL test terminal not grounded.
All B+ voltages indicate charging or battery voltage.
All "0" voltages are ground circuits (should read less than 0.50 volt).

Fig 1: ECM Terminal Identification

Courtesy of ISUZU MOTOR CO.