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).

1. Reads B+ for 2 seconds after ignition is turned on, then zero volts.
2. B+ in gear and clutch pedal not depressed.
3. B+ or zero volts depending on position of drive wheels.
4. B+ for 2 seconds.
5. Zero volts with steering wheel fully turned.
6. A/T vehicles only.

Fig 1: ECM Terminal Identification (3.2L Passport)

Courtesy of ISUZU MOTOR CO.