Dtc C1812/12 Pressure Sensor Malfunction / Upside


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (OIL PRESSURE SENSOR)

RECONFIRM DTC

INSPECT STABILIZER CONTROL ECU (SBP1 VOLTAGE)

CHECK HARNESS AND CONNECTOR (STABILIZER CONTROL ECU - ACCUMULATOR PRESSURE SENSOR)

INSPECT ACCUMULATOR PRESSURE SENSOR (OUTPUT VOLTAGE)

READ VALUE USING INTELLIGENT TESTER (OIL PRESSURE SENSOR)

CHECK HARNESS AND CONNECTOR (STABILIZER CONTROL ECU - ACCUMULATOR PRESSURE SENSOR)

DTC C1812/12 Pressure Sensor Malfunction / Upside


DESCRIPTION

In the KDSS hydraulic circuit, the fluid is contained under pressure. If the fluid temperature is 20°C (68°F), the pressure is approximately 3.0 MPa (30.6 kgf/cm2, 435 psi).

DTC Code
DTC Detection Condition
Trouble Area
C1812/12
One of the following conditions continues is met:
  1. The sensor power source voltage (SBP1 terminal) is 4.3 V or less for 0.5 seconds with the ignition switch ON.
  2. The sensor power source voltage (SBP1 terminal) is 5.5 V or higher for 0.5 seconds with the ignition switch ON.
  3. The sensor output (SOP1 terminal) is 0.3 V or less for a second with the ignition switch ON.
  4. The sensor output (SOP1 terminal) is 4.7 V or higher for a second with the ignition switch ON.
  1. Harness or connector
  2. Accumulator pressure sensor (Stabilizer control with accumulator housing assembly)
  3. Stabilizer control ECU

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1812/12 Pressure Sensor Malfunction / Upside


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (OIL PRESSURE SENSOR)
NOTICE:
  1. Perform the inspection on a level surface.
  2. Perform the inspection with the vehicle empty.
  3. Make sure that the wheels are on the ground and facing straight ahead.
  4. Perform the inspection with the vehicle load completely on the suspension.

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / KDSS / Data List.

  1. Select the item below in the Data List, and read the value displayed on the intelligent tester.

    KDSS
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Oil Pressure Sensor
    		Oil pressure sensor/
    Min.: -784.79 MPa (-8002.66 kgf/cm2, -113794.55 psi)
    Max.: 784.76 MPa (8002.35 kgf/cm2, 113790.20 psi)
    		2.6 MPa (26.5 kgf/cm2, 377 psi) to 3.0 MPa (30.6 kgf/cm2, 435 psi): When vehicle stopped and fluid temperature 20°C (68°F)
    		-

  1. Check the fluid pressure.

    OK:
    2.6 MPa (26.5 kgf/cm2, 377 psi) to 3.0 MPa (30.6 kgf/cm2, 435 psi)


NG
Go to step 3
OK


2.RECONFIRM DTC

  1. Clear the DTCs (LandCruiser RM000001N9I01KX.html).

  1. Check for DTCs (LandCruiser RM000001N9I01KX.html).

    Result
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B


B
USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)
A

REPLACE STABILIZER CONTROL ECU (LandCruiser RM000002KLG00RX.html)

3.INSPECT STABILIZER CONTROL ECU (SBP1 VOLTAGE)

  1. Connect the stabilizer control ECU connector.

  1. Disconnect the Stabilizer control with accumulator housing connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1812/12 Pressure Sensor Malfunction / Upside

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    R20-3 (SBP1) - Body ground
    		Ignition switch ON
    		4.75 to 5.25 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stabilizer Control with Accumulator Housing Assembly)


NG
Go to step 7
OK


4.CHECK HARNESS AND CONNECTOR (STABILIZER CONTROL ECU - ACCUMULATOR PRESSURE SENSOR)

  1. Disconnect the Stabilizer control ECU connector.

  1. Disconnect the Stabilizer control with accumulator housing connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G123-17 (SOP1) - R20-2 (SOP1)
    		Always
    		Below 1 Ω
    G123-17 (SOP1) - Body ground
    		Always
    		10 kΩ or higher
    G123-6 (SGP1) - R20-1 (SGP1)
    		Always
    		Below 1 Ω
    G123-6 (SGP1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT ACCUMULATOR PRESSURE SENSOR (OUTPUT VOLTAGE)

  1. Connect the stabilizer control ECU connector.

  1. Connect the Stabilizer control with accumulator housing connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1812/12 Pressure Sensor Malfunction / Upside

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G123-17 (SOP1) - Body ground
    		Ignition switch ON
    		0.4 to 4.6 V
    Text in Illustration
    *a
    		Component with harness connected
    (Stabilizer Control ECU)


NG
Go to step 6
OK

REPLACE STABILIZER CONTROL ECU (LandCruiser RM000002KLG00RX.html)

6.READ VALUE USING INTELLIGENT TESTER (OIL PRESSURE SENSOR)

  1. Disconnect the Stabilizer control with accumulator housing connector.

  1. Connect the stabilizer control ECU connector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / KDSS / Data List.

  1. Select the item below in the Data List, and read the value displayed on the intelligent tester.

    KDSS
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Oil Pressure Sensor
    		Oil pressure sensor/
    Min.: -784.79 MPa (-8002.66 kgf/cm2, -113794.55 psi)
    Max.: 784.76 MPa (8002.35 kgf/cm2, 113790.20 psi)
    		2.6 MPa (26.5 kgf/cm2, 377 psi) to 3.0 MPa (30.6 kgf/cm2, 435 psi): When vehicle stopped and fluid temperature 20°C (68°F)
    		-


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1812/12 Pressure Sensor Malfunction / Upside

  1. Using a 1.5 V dry cell battery, connect the positive (+) lead to terminal 2 (SOP1) of the stabilizer control with accumulator housing connector and the negative (-) lead to terminal 1 (SGP1), and check that the Data List display changes.

    OK:
    Data List display changes.
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stabilizer Control with Accumulator Housing Assembly)


NG
REPLACE STABILIZER CONTROL ECU (LandCruiser RM000002KLG00RX.html)
OK

REPLACE STABILIZER CONTROL WITH ACCUMULATOR HOUSING ASSEMBLY (LandCruiser RM000002KK0011X.html)

7.CHECK HARNESS AND CONNECTOR (STABILIZER CONTROL ECU - ACCUMULATOR PRESSURE SENSOR)

  1. Disconnect the Stabilizer control ECU connector.

  1. Disconnect the Stabilizer control with accumulator housing connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G123-15 (SBP1) - R20-3 (SBP1)
    		Always
    		Below 1 Ω
    G123-15 (SBP1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE STABILIZER CONTROL ECU (LandCruiser RM000002KLG00RX.html)