Toyota 4Runner: Low Pressure Malfunction in Upside of KDSS System (C1851/51,C1853/53)

Toyota 4Runner Service Manual / Suspension / Suspension Control / Kinetic Dynamic Suspension System / Low Pressure Malfunction in Upside of KDSS System (C1851/51,C1853/53)

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
C1851/51	The sensor output is 0.9 MPa (9.2 kgf/cm2, 130 psi) or less for 5 min. continuously with the ignition switch ON.	Hydraulic circuit Harness or connector Accumulator pressure sensor or stabilizer control solenoid valve (Stabilizer control with accumulator housing assembly) Stabilizer control ECU
C1853/53	The sensor output is 8.8 MPa (89.7 kgf/cm2, 1276 psi) or more for 20 sec. continuously with the ignition switch ON.

CAUTION / NOTICE / HINT

HINT:

When these DTCs are output, perform the hydraulic circuit inspection first (See page ).

If the DTCs cannot be cleared even after the hydraulic circuit inspection, perform the electrical circuit inspection by following the procedures below.

PROCEDURE

1.	INSPECT FOR FLUID LEAK

(a) Inspect for fluid leaks (See page ).

OK:

No fluid leaks.

REPAIR FLUID LEAK OR REPLACE PARTS AS NECESSARY

2.	CHECK ANY OTHER DTCS OUTPUT (DTC C1812/12, C1831/31 AND/OR C1832/32)

(a) Check if DTC C1812/12, C1831/31 and/or C1832/32 is output (See page ).

Result

Result	Proceed to
No DTC is output	A
DTC C1812/12, C1831/31 and/or C1832/32 is output	B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

3.	INSPECT STABILIZER CONTROL SOLENOID VALVE (CHECK IF VALVE STUCK)

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

(b) Check for an operating sound of the stabilizer control solenoid valve.

(1) for Upper Chamber:

Connect terminal 5 (SLAL) to the positive (+) battery terminal, and terminal 4 (AUG) to the negative (-) battery terminal.

OK:

An operating sound (click sound) can be heard.

Text in Illustration

*a	Component without harness connected (Stabilizer Control with Accumulator Housing Assembly)

(2) for Lower Chamber:

Connect terminal 6 (SLAU) to the positive (+) battery terminal, and terminal 4 (AUG) to the negative (-) battery terminal.

OK:

An operating sound (click sound) can be heard.

Text in Illustration

*a	Component without harness connected (Stabilizer Control with Accumulator Housing Assembly)

REPLACE STABILIZER CONTROL WITH ACCUMULATOR HOUSING ASSEMBLY

4.	INSPECT FOR CLOGS IN HYDRAULIC CIRCUIT

(a) Bleed air and check that the hydraulic circuit is not clogged (See page ).

OK:

Hydraulic circuit is not clogged.

REPAIR HYDRAULIC CIRCUIT MALFUNCTIONS OR REPLACE PARTS AS NECESSARY

5.	RECONFIRM DTC

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

Result

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

USE SIMULATION METHOD TO CHECK

REPLACE STABILIZER CONTROL ECU

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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). ...

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