Continuity Checks A & B

Figure 2:

Continuity Check A, (open circuit check) Figure 2

1. Turn Ignition Key Off and disconnect the vehicle battery.

2. Disconnect the ECM and the engine component connectors.

3. Connect a jumper wire to the harness side of the appropriate pin of the ECM connector.

IMPORTANT: Be very careful not to spread or otherwise damage the connector pin.

4. Route the jumper wire to the engine compartment.

5. Connect an ohmmeter between the jumper wire and the harness side of the appropriate pin of the component connector.

6. Aggressively wiggle the EGI harness side to side and up and down while you monitor the ohmmeter reading.

^ Resistance value should be close to zero ohms. If resistance value is high/over range or fluctuates, an open circuit exists.

NOTE: If resistance is high or over range, be sure it is not caused by poor ohmmeter probe or jumper wire connections.



Continuity Check B (short to ground check - shielded wires only)

1. After completing Continuity Check A, move the ohmmeter lead from the component connector to an engine ground.

2. Again aggressively wiggle the EGI harness side to side and up and down while you monitor the ohmmeter reading.

^ The resistance value should indicate an open circuit with infinite resistance (over range). If other than infinite resistance is indicated, the wire's shield is shorted to the signal wire and you must replace the harness.

NOTE: If the resistance value indicates an open circuit, be sure it is not caused by poor ohmmeter probe or jumper wire connections.