Toyota 4Runner: Pressure Sensor Malfunction / Upside (C1812/12)

Toyota 4Runner Service Manual / Suspension / Suspension Control / Kinetic Dynamic Suspension System / Pressure Sensor Malfunction / Upside (C1812/12)

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 is met: The sensor power source voltage (SBP1 terminal) is 4.3 V or less for 0.5 seconds with the ignition switch ON. The sensor power source voltage (SBP1 terminal) is 5.5 V or higher for 0.5 seconds with the ignition switch ON. The sensor output (SOP1 terminal) is 0.3 V or less for 1 second with the ignition switch ON. The sensor output (SOP1 terminal) is 4.7 V or higher for a second with the ignition switch ON.	Harness or connector Accumulator pressure sensor (Stabilizer control with accumulator housing assembly) Stabilizer control ECU

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM (OIL PRESSURE SENSOR)

NOTICE:

Perform the inspection on a level surface.
Perform the inspection with the vehicle empty.
Make sure that the wheels are on the ground and facing straight ahead.
Perform the inspection with the vehicle load completely on the suspension.

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / KDSS / Data List.

(f) Select the item below in the Data List, and read the value displayed on the Techstream.

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)	-

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)

(g) Check the fluid pressure.

OK:

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

GO TO STEP 3

2.	RECONFIRM DTC

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

Result

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

REPLACE STABILIZER CONTROL ECU

USE SIMULATION METHOD TO CHECK

3.	INSPECT STABILIZER CONTROL ECU (SBP1 VOLTAGE)

(a) Connect the stabilizer control ECU connector.

(b) Disconnect the stabilizer control with accumulator housing connector.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
O23-3 (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)

GO TO STEP 7

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

(a) Disconnect the stabilizer control ECU connector.

(b) Disconnect the stabilizer control with accumulator housing connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F70-17 (SOP1) - O23-2 (SOP1)	Always	Below 1 Ω
F70-17 (SOP1) - Body ground	Always	10 kΩ or higher
F70-6 (SGP1) - O23-1 (SGP1)	Always	Below 1 Ω
F70-6 (SGP1) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT ACCUMULATOR PRESSURE SENSOR (OUTPUT VOLTAGE)

(a) Connect the stabilizer control ECU connector.

(b) Connect the stabilizer control with accumulator housing connector.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F70-17 (SOP1) - Body ground	Ignition switch ON	0.4 to 4.6 V

Text in Illustration

*a	Component with harness connected (Stabilizer Control ECU)

REPLACE STABILIZER CONTROL ECU

6.	READ VALUE USING TECHSTREAM (OIL PRESSURE SENSOR)

(a) Disconnect the stabilizer control with accumulator housing connector.

(b) Connect the stabilizer control ECU connector.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Chassis / KDSS / Data List.

(g) Select the item below in the Data List, and read the value displayed on the Techstream.

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)	-

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)

(h) 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)

REPLACE STABILIZER CONTROLWITH ACCUMULATORHOUSING ASSEMBLY

REPLACE STABILIZER CONTROL ECU

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

(a) Disconnect the stabilizer control ECU connector.

(b) Disconnect the stabilizer control with accumulator housing connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F70-15 (SBP1) - O23-3 (SBP1)	Always	Below 1 Ω
F70-15 (SBP1) - Body ground	Always	10 kΩ or higher

REPLACE STABILIZER CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

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