Dtc P2431 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1GR-FE ENGINE CONTROL

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (EMISSION CONTROL VALVE SET - ECM)

CHECK TERMINAL VOLTAGE (VC OF EMISSION CONTROL VALVE SET)

REPLACE EMISSION CONTROL VALVE SET

CHECK WHETHER DTC OUTPUT RECURS

DTC P2431 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1

DTC P2432 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Low Bank1

DTC P2433 Secondary Air Injection System Air Flow / Pressure Sensor Circuit High Bank1

DTC P2436 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank 2

DTC P2437 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Low Bank 2

DTC P2438 Secondary Air Injection System Air Flow / Pressure Sensor Circuit High Bank 2

DESCRIPTION

Refer to DTC P0412 ().


Refer to DTC P0416 ().

DTC No.DTC Detection ConditionTrouble Area
P2431
P2436		Pressure sensor indicates a value below 45.6 kPa (342 mmHg), or higher than 135 kPa (1013 mmHg) (2 trip detection logic).
Emission control valve set
Open or short in pressure sensor circuit
ECM
P2432
P2437		While the engine is running, the voltage output of the pressure sensor is below 0.5 V (1 trip detection logic).
Emission control valve set
Open or short in pressure sensor circuit
ECM
P2433
P2438		While the engine is running, the voltage output of the pressure sensor is higher than 4.5 V (1 trip detection logic).
Emission control valve set
Open or short in pressure sensor circuit
ECM

MONITOR DESCRIPTION

Dtc P2431 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1. 1GR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

The ECM monitors the pressure in the secondary air passage using the pressure sensor located on the emission control valve set in the secondary air injection system. Using this pressure value, the ECM determines whether the secondary air injection system is malfunctioning or not.


If there is a defect in the sensor or the sensor circuit, the voltage level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the pressure sensor or circuit and stores a DTC.


WIRING DIAGRAM

Dtc P2431 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1. 1GR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • HINT:
Refer to "Data List / Active Test" [Air Pump Pressure (Absolute) and Air Pump2 Pressure (Absolute)] ().
Read freeze frame data using the GTS. 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
Bank 2 refers to the bank that does not include the No. 1 cylinder.
1.CHECK HARNESS AND CONNECTOR (EMISSION CONTROL VALVE SET - ECM)

Disconnect the emission control valve set connector.

Disconnect the ECM connectors.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    C137-3 (AIP) - A38-54 (AIP)AlwaysBelow 1 Ω
    C137-2 (VC) - C45-66 (VCV2)AlwaysBelow 1 Ω
    C137-4 (E2) - C45-98 (ETHA)AlwaysBelow 1 Ω
    C138-3 (AIP2) - A38-53 (AIP2)AlwaysBelow 1 Ω
    C138-2 (VC2) - C45-66 (VCV2)AlwaysBelow 1 Ω
    C138-4 (E22) - C45-98 (ETHA)AlwaysBelow 1 Ω
    C137-3 (AIP) or A38-54 (AIP) - Body groundAlways10 kΩ or higher
    C137-2 (VC) or C45-66 (VCV2) - Body groundAlways10 kΩ or higher
    C138-3 (AIP2) or A38-53 (AIP2) - Body groundAlways10 kΩ or higher
    C138-2 (VC2) or C45-66 (VCV2) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
2.CHECK TERMINAL VOLTAGE (VC OF EMISSION CONTROL VALVE SET)
Dtc P2431 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1. 1GR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the emission control valve set connector.

Turn the ignition switch to ON.

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    C137-2 (VC) - C137-4 (E2)Ignition switch ON4.5 to 5.5 V
    C138-2 (VC2) - C138-4 (E22)Ignition switch ON4.5 to 5.5 V
Text in Illustration
*Afor Bank 1
*Bfor Bank 2
*aFront view of wire harness connector
(to Emission Control Valve Set)
NG
REPLACE ECM ()
OK
3.REPLACE EMISSION CONTROL VALVE SET

Replace the emission control valve set.

  • HINT:
Replace the No. 1 emission control valve set ().
Replace the No. 2 emission control valve set ().
NEXT
4.CHECK WHETHER DTC OUTPUT RECURS

Start the engine and warm it up.

Turn the ignition switch off.

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Clear the DTCs (if stored) ().

Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Automatic Mode.

Start the engine after the GTS initialization is finished.

Perform the System Check operation by pressing ENTER (Next).

Perform the following to confirm the secondary air injection system pending codes: Press the Exit button.

Check for pending DTCs.

  • OK:
  • No pending DTC is output.

Turn the ignition switch off.

  • NOTICE:
When performing the Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
Turn the ignition switch off when the Secondary Air Injection Check operation finishes.
NG
REPLACE ECM ()
OK
END