OXYGEN SENSOR INSPECTION

18th December 2003

Taken from 4AG-E 20Valve Engine Repair Manual page FI-68 & 69 and summarised

A) Measure O2 sensors pin +B and HT (should get between 11 to 16 ohms at 20 celcius)

If OK then

B) Inspect Feedback Voltage - use analog multi meter to measure voltage between VF1 and E1

  1. Warm up the oxygen sensor with the engine at 2,500 rpm for approx. 120 seconds.
  2. Connect TE1 and E1 and maintain 2,500 rpm
  3. Check the number of times the voltmeter needle fluctuates in 10 seconds.

Scenario 1 - If 8 times or more means OK good O2 sensor.

 

Scenario 2 - If less than 8 times repeat 1, 2 and 3 above then: -

If still less than 8 times, disconnect TE1 and E1 and measure voltage between VF1 and E1. If more than 0V - then replace the oxygen sensor.

 

Scenario 3 - If the needle never fluctuates, i.e. zero times then read and record diagnostic trouble codes.

Repair diagnostic error accordingly

 

Scenario 4 - If codes are 21 or 25 then proceed below: -

Measure voltage between VF1 and E1. If 0V - disconnect the PCV hose. Wonder what is this?

After disconnecting the PCV (which I don't know what it is), then measure voltage between VF1 and E1 again. If more than 0V = Over rich (repair) - [but repair what???]

 

Scenario 5 - If the needle never fluctuates, i.e. zero times then read and record diagnostic trouble codes.

Measure voltage between VF1 and E1. If 5V then

  1. Disconnect water temp. sensor and connect resistor 4-8 k ohms as simulation to fool ECU.
  2. Short TE1 and E1.
  3. Warm up the oxygen sensor with the engine at 2,500 rpm for approx. 120 seconds and maintain 2,500 rpm.
  4. Measure voltage between VF1 and E1.

If 0V - then replace the oxygen sensor

If 5V = over lean (repair) [but repair what???]

 

 

eeeeerrrrrrrrr do you still follow me??? the question is do I still follow the manual???) hehehehehh ahahhahaahh

By the way a new O2 sensor from UMW Toyota cost Ringgit Malaysia (RM) 602.25 - so forget about the new one :( 

In case you still want it, start looking from vehicle identity number VIN AE101-ACMZF (Toyota Corolla Levin GT-Apex 2 door) Sensor, OXYGEN part number 89465-19495

 

  1. Diagnosis System
  2. Diagnostic by DCN Pro
  3. Diagnostic for a friend
  4. Different Diagnosis
  5. Results 1
  6. Results 2
  7. Results 3
  8. Results 4
  9. References
  10. OXYGEN SENSOR INSPECTION

 

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