DTC    P0131    Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 1)

DTC    P0132    Oxygen Sensor Circuit High Voltage Bank1 Sensor1

DTC    P0134    Heated Oxygen (A/F) Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

for Preparation Click here


DESCRIPTION

In order to obtain high purification rates for the carbon monoxide (CO) and hydrocarbon (HC) and a high collection/oxidization rate for particulate matter (PM) in the exhaust gas, a CCo + DPF catalytic converter is used. The air fuel ratio sensor is used to compensate for variation in the EGR rate to reduce PM accumulation of the DPF catalytic converter.
The A/F sensor provides an output voltage that is proportional to the air-fuel ratio that it is measuring. The A/F sensor output voltage is used as feedback to allow the ECM to control the A/F mixture. The inner surface of the air fuel ratio sensor element is exposed to outside air. The outer surface of the sensor element is exposed to exhaust gases. The sensor element is made of platinum coated zirconia and includes an integrated heating element. The zirconia element generates a small voltage when there is a large difference in the oxygen concentrations of the exhaust and the outside air. The platinum coating amplifies the voltage generation. When heated, the sensor becomes very efficient. If the temperature of the exhaust is low, the sensor will not generate useful voltage signals without supplemental heating. The ECM regulates the supplemental heating by using a duty-cycle approach to regulate the average current in the heater element.

HINT:
Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.


P0131 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Vehicle driving with warm engine
Short in air fuel ratio sensor circuit
(1 trip detection logic)
  1. Short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM

P0132 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Vehicle driving with warm engine
Short in air fuel ratio sensor circuit
(1 trip detection logic)
  1. Short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM

P0134 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Idling with warm engine
Open in wire harness of air fuel ratio sensor circuit
(1 trip detection logic)
  1. Open in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM

WIRING DIAGRAM


A198993E02


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the ECM and/or air fuel ratio sensor, the ECM needs Registration and Initialization (Click here).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:
  1. When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

1.CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

  1. Disconnect the air fuel ratio sensor connector.



    A200332E02

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    B35-4 (AF1+) - A19-69 (AF1+)
    		Always
    		Below 1 Ω
    B35-6 (TR) - A19-68 (TR)
    		Always
    		Below 1 Ω
    B35-1 (AF1-) - A19-70 (AF1-)
    		Always
    		Below 1 Ω
    B35-3 (RE) - A19-71 (RE)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    B35-4 (AF1+) or A19-69 (AF1+) - Body ground
    		Always
    		10 kΩ or higher
    B35-6 (TR) or A19-68 (TR) - Body ground
    		Always
    		10 kΩ or higher
    B35-1 (AF1-) or A19-70 (AF1-) - Body ground
    		Always
    		10 kΩ or higher
    B35-3 (RE) or A19-71 (RE) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Air Fuel Ratio Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the air fuel ratio sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 4
OK


2.REPLACE AIR FUEL RATIO SENSOR

  1. Replace the air fuel ratio sensor (Click here).

  1. Perform the A/F Sensor Compensation Reset (Click here).


NEXT


3.CHECK WHETHER DTC OUTPUT RECURS (DTC P0131, P0132 OR P0134)

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (Click here).

  1. Start the engine and warm it up until the engine coolant temperature reaches at 70°C (158°F) or more.

  1. Allow the engine to idle for 5 minutes or more.

  1. Drive the vehicle with a stop-and-go city drive pattern for more than 15 minutes.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.
    Result 
    Result
    		Proceed to
    DTC P0131, P0132 or P0134
    		A
    No DTC output
    		B



A
Go to step 5

B
END

4.REPAIR OR REPLACE HARNESS OR CONNECTOR


NEXT
Go to step 6

5.REPLACE ECM

  1. Replace the ECM (Click here).


NEXT


6.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (Click here).

  1. Start the engine and warm it up until the engine coolant temperature reaches at 70°C (158°F) or more.

  1. Allow the engine to idle for 5 minutes or more.

  1. Drive the vehicle with a stop-and-go city drive pattern for more than 15 minutes.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Confirm that the DTC is not output again.


NEXT

END