Diagnostic Tools

The ECC system requires a circuit tester, stethoscope and a dry cell battery for diagnosis. The circuit tester is used to measure voltage and resistance of check connectors I-VI. See Fig 1 and Fig 2 . It is also used to measure resistance of duty solenoids and vacuum sensor after lead connectors are unplugged. The stethoscope or vinyl tube is used to check operating sound from duty solenoid valves. The dry cell battery is used to test O2 sensor and its wiring for defects.

Fig 1: ECC Test Connector Locations Connectors I, II and III are located near windshield wiper motor in engine compartment. Connectors IV, V and VI are located below steering column.

Fig 2: Test Connector Identification