Oxygen (O2) Sensor Check With System Checker 83

This procedure determines if the Oxygen (O2) sensor signal is fed to the control unit correctly.

Fig 1: Location of Throttle Sensor Connector

1. Start engine and let it idle. Disconnect throttle sensor connector. See Fig 1 . The Red lamp, buzzer and Green lamp should indicate as in Fig 2 .
   Fig 2: Red Lamp, Green Lamp & Buzzer Indication (1 of 3)

   
2. Increase engine speed to 2000 RPM. Make sure the Green light illuminates within 10 seconds after increasing the engine speed to 2000 RPM. The Red lamp, buzzer and Green lamp should indicate as in Fig 3 .
   Fig 3: Red Lamp, Green Lamp & Buzzer Indication (2 of 3)

   
3. While holding engine speed at 2000 RPM, disconnect the Oxygen (O2) sensor connector. The Red lamp, buzzer and Green lamp should indicate as in Fig 4 .
   Fig 4: Red Lamp, Green Lamp & Buzzer Indication (3 of 3)

   
4. Use the OXYGEN SENSOR TEST table to determine the problem.