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.