Diagnostic Aids: Notes

Check for any of the following conditions:

• Check the resistance of the relay. The resistance across the coil terminals is 70-95 ohms at 20°C (68°F). The resistance across the switched terminals is infinite.
• The relay electrical contacts may be pitted or sticking. Replace the relay if tapping gently on the relay or wiggling the relay causes a change in the relays operation.
• The performance of the relay may be affected by temperature. Test the relay after sitting outside overnight and after running the engine 30 minutes.

An intermittent malfunction may be caused by a fault in the relay electrical circuit. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions .

Use the following relay cavity table in order to locate the correct cavities to probe during diagnosis. The table layout corresponds to the cavity layout of the relay block.