Dtc P0135/21 Oxygen Sensor Heater Circuit (Bank 1 Sensor 1)


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT HEATED OXYGEN SENSOR

CHECK HARNESS AND CONNECTOR (+B VOLTAGE)

INSPECT INTEGRATION NO.1 RELAY (MAIN RELAY)

CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM, INTEGRATION RELAY (MAIN RELAY))

CHECK IF DTC OUTPUT RECURS

DTC P0135/21 Oxygen Sensor Heater Circuit (Bank 1 Sensor 1)


DESCRIPTION

Refer to DTC P0130/21 (Toyota Fortuner RM000000ZQ9007X_01.html).

DTC No.
DTC Detection Condition
Trouble Area
P0135/21
Open or short in heater circuit of oxygen sensor for 0.5 seconds or more
  1. Open or short in heater circuit of oxygen sensor
  2. Heated oxygen sensor
  3. ECM
HINT:
Sensor 1 refers to the sensor closer to the engine assembly.

WIRING DIAGRAM

Refer to DTC P0130/21 (Toyota Fortuner RM000000ZQ9007X_02.html).

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.INSPECT HEATED OXYGEN SENSOR
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0135/21 Oxygen Sensor Heater Circuit (Bank 1 Sensor 1)

  1. Disconnect the H9 sensor connector.

  1. Measure the resistance of the sensor.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (HT1A) - 2 (+B)
    		20°C (68°F)
    		5 to 10 Ω
    1 (HT1A) - 4 (E2)
    		-
    		10 kΩ or higher


NG
REPLACE HEATED OXYGEN SENSOR
OK


2.CHECK HARNESS AND CONNECTOR (+B VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0135/21 Oxygen Sensor Heater Circuit (Bank 1 Sensor 1)

  1. Disconnect the H9 heated oxygen sensor connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    H9-2 (+B) - Body ground
    		9 to 14 V


OK
Go to step 4
NG


3.INSPECT INTEGRATION NO.1 RELAY (MAIN RELAY)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0135/21 Oxygen Sensor Heater Circuit (Bank 1 Sensor 1)

  1. Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).

  1. Measure the voltage of the MAIN relay.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    1J-5 - Body ground
    		Ignition switch ON
    		10 to 14 V


NG
REPLACE INTEGRATION NO.1 RELAY
OK


4.CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM, INTEGRATION RELAY (MAIN RELAY))
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0135/21 Oxygen Sensor Heater Circuit (Bank 1 Sensor 1)

  1. Disconnect the H9 sensor connector.

  1. Disconnect the E11 ECM connector.

  1. Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).

  1. Disconnect the 1J integration relay connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    H9-1 (HT1A) - E11-1 (HT1A)
    		Below 1 Ω
    H9-2 (+B) - 1J-5
    		Below 1 Ω
    H9-1 (HT1A) or E11-1 (HT1A) - Body ground
    		10 kΩ or higher
    H9-2 (+B) or 1J-5 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK IF DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the tester ON.

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

  1. Read the DTCs.

    Result:
    Display (DTC output)
    		Proceed to
    No output
    		A
    Heated oxygen sensor circuit DTCs
    		B


B
REPLACE ECM
A

CHECK FOR INTERMITTENT PROBLEMS