Checking the signal cable

Fig 1: Identifying Ignition ON

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Fig 2: Identifying Connector

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• Front heated oxygen sensor (HO2S) connector disconnected
• Ignition on.

  Connect a voltmeter between connector terminal #4 on the heated oxygen sensor (HO2S) (control module side) and ground.

  Fig 3: Identifying Heated Oxygen Sensor Connector Terminals

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  Fig 4: Identifying Voltage Display

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The voltmeter should read approximately 0.5 V. 

• OK 

  Refer to Defective heated oxygen sensor (HO2S) 

• NOT OK 

  Refer to Checking the signal cable 

Check the cable between heated oxygen sensor (HO2S) connector terminal #4 and engine control module (ECM) connector terminal #45. Check for an open-circuit according to Open-circuit, permanent faults . Check for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

Remedy as necessary.

Fig 1: Identifying Heated Oxygen Sensor Connector Terminals

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Fig 2: Identifying Ohmmeter

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Fig 3: EMS2000

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• Continue 

  Refer to Verification