DIAGNOSTIC TROUBLE CODE

DTC P0134 OXYGEN SENSOR NO ACTIVITY

 

 

  

Circuit Know-how

 

  • A voltage of about 0.45 volts between terminals M12 and M29 approximately is provided by the Engine Control Module (ECM).It is to be noted also that in case it is measured with a 10 mega ohm digital voltmeter the reading may be 0.32 volts. 
  • When the exhaust is rich the voltage gets altered between 1 volt and down through about 0.10 volts when the exhaust is lean.
  • This task is executed by the Oxygen Sensor (O2S).
  • If the voltage dips lesser than 315°C then the sensor which is like an open circuit, does not generate any voltage.
  • Open Loop operation is initiated by an open sensor circuit or cold sensor.
  • You need to get a complete new O2S assembly in case the O2S pigtail wiring, connector, or terminal is tampered.
  • It is advised that no attempt to mend the wiring, connector, or terminals is taken instead of complete replacement.
  • A constant and clean air reference which is got from the O2S wire(s) must be supplied so that the sensor functions smoothly.
  • The air reference may be partly or fully blocked and the O2S performance may be lowered considerably if any attempt to mend the wires, connector or terminals is made.
  • You may read up ‘oxygen sensor’ for more details.

 

  

 

When will DTC set?

 

 

Task boosted after DTC sets

 

 When will DTC clear?

 

DTC will set when:

1) O2S voltage dwells round 300 and 600 mV.

 

 

1) The Malfunction Indicator Lamp (MIL) will be seen to glow.

 

 

1) A history DTC will unset after 40 flawless and repetitive warm-up cycles.

 

 

2) Engine Coolant Temperature (ECT) > 60°C (140°F).

 

 

2) The ECM will begin storing conditions from the time the DTC had failed.

 

2) De-linking the ECM battery feed for more than 10 seconds will also help.

 

 

 

3) System voltage > 10 volts.

 

 

3) The obtained data will be recorded as Freeze Frame data boosting Failure Records simultaneously.

 

 

3) DTC(s) can be unset by using the scan tool.

 

 

 

 

4) Engine run time > 1 minute.

 

4) A history DTC will be recorded.

 

 

4) The MIL will be seen to switch off after four successive ignition cycles where the diagnostic runs perfectly.

 

 

5) 3 second delay conditions are met.

 

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6) Airflow > 9 g/sec.

 

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7) The vehicle will operate in Open Loop.

 

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8) DTCs P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0300, P0336, P0337, P0351, P0352, P0402, P0404, P0405, P0406, P0506, P0507, P1404, and P0443 are not set.

 

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Diagnostic Assistance

  1. In Closed Loop normal scan tool voltage revolves round 150 mV to 850 mV.
  2. Consulting any text on intermittent will help in case DTC P0134 is intermittent.

 

 

HOW TO REMOVE A DTC

DTC P0134 - Oxygen Sensor No Activity (2.0L DOHC)

 

 

Step

Task to be taken

Positive

Negative

1

 

Carry out the EOBD System Check.

 

Task accomplished?

 

Read

 Step 2

Read  "On-Board Diagnostic System Check"

2

  1. Link up a scan tool to the Data Link Connector (DLC).
  2. Let the engine star.
  3. Allow it to idle at normal operating temperature.
  4. Control the engine above the specified rpm for 120 seconds.

Do you notice that the scan tool shows that there is Closed Loop and the values are as given: 80?°C (176?°F) and 1200 rpm?

 

 

Read 

Step 3

Read

 Step 4

3

  1. Read and note the Freeze Frame data.
  2. Observe the parameters.
  3. Regulate the vehicle within the Freeze frame conditions and Conditions For Setting the DTC as noted.

Do you see that the scan tool shows Closed Loop?

 

Read

 Step 12

Read 

Step 4

4

  1. Switch OFF the ignition.
  2. De-link O2S connector.
  3. Jumper the terminal 2 of O2S connector and ground.
  4. Now switch ON the ignition.

Do you see that the scan tool shows that the O2S voltage revolves round 400-500 mV?

 

Read

 Step 5

Read 

Step 8

5

1)       Examine the O2S harness connector and see if there is any malfunction or improper connection.

2)       Mend as needed.

 

Task complete?

Read 

Step 12

Read 

Step 6

6

  1. Let the engine idle.
  2. Take out the jumper wire.
  3. Read and note the voltage between terminal 1 of O2S and ground with the help of a voltmeter.

Do you see that the voltage reads > 600 mV?

 

Read

 Step 7

Read

 Step 11

7

  1. Switch OFF the ignition.
  2. Read and note the voltage between terminal 1 of O2S and ground with the help of a voltmeter.

Do you see that the voltage reads < 300 mV?

 

Read

 Step 9

Read

 Step 11

8

1)       Examine the O2S low circuit and see if you can see any open or short to ground between terminal 2 of the O2S and terminal M29 of the ECM.

2)       Make all necessary changes.

 

Did you finish making the change?

 

Read 

Step 12

Read

 Step 10

9

1)       Look up the O2S signal circuit to note if there is any open or short to ground between terminal 1 of the O2S and terminal M12 of the ECM.

2)        Make all necessary changes if there is any flaw.

 

Job over?

 

Read 

Step 12

Read

 Step 10

10

  1. Switch OFF the ignition.
  2. Get a new ECM.

Work done?

 

Read  

Step 12

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11

 

Fix a new O2S.

 

Task accomplished?

 

Read 

Step 12

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12

  1. Unset all the DTCs taking a Scan Tool.
  2. Allow the engine to start.
  3. Let it idle at normal operating temperature.
  4. Regulate the vehicle within the Conditions for setting this DTC as specified in the supporting text.

Do you see that the scan tool says that the diagnostic has been run and passed?

 

Read

 Step 13

Read 

Step 2

13

 

Examine whether there are any more DTCs are set.

 

Do you see any undiagnosed DTCs still being seen?

 

Read  Applicable DTC Table

The system of the vehicle is good