Checking the signal cable

Fig 1: Identifying Ignition OFF

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• Ignition off.

  Connect a voltmeter between engine cooling fan (FC) relay base terminal #2 and ground.

  Fig 2: Identifying Ohmmeter

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  Fig 3: Identifying System Relay Base Connector Terminals

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The ohmmeter should read infinite resistance. 

• OK 

  Refer to Checking the engine cooling fan (FC) relay 

• NOT OK 

  Refer to Checking the signal cable 

Fig 1: Identifying Ignition OFF

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• Ignition off.

  Check the cable between engine cooling fan (FC) relay terminal #2 and engine control module (ECM) connector terminal #8 for an open-circuit according to Open-circuit, permanent faults .

  Remedy as necessary.

  Fig 2: Identifying System Relay Control Connector Terminals

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  Fig 3: Identifying Ohmmeter

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  Fig 4: Identifying EMS2000

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• Continue 

  Refer to Verification 

Check the cable between engine cooling fan (FC) relay base terminal #2 and engine control module (ECM) connector terminal #8. Check for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Fig 1: Identifying System Relay Control Connector Terminals

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Fig 2: Identifying Ohmmeter

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Fig 3: Identifying EMS2000

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• Continue 

  Refer to Verification