Diagnostic Aids

Check for any of the following conditions:

• The resistance of the circuit opening relay-The resistance across terminal 3 and terminal 4 is 85-95 ohms at 20°C (68°F). The resistance across terminal 1 and terminal 2 is infinite.
• The circuit opening relays 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 circuit opening relay may be affected by temperature. Check the relay after sitting outside overnight and after running the engine 30 minutes.

An intermittent malfunction may be caused by a fault in the fuel pump electrical circuit. 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.