Toyota 4Runner: Accumulator Solenoid Malfunction / Upside (C1831/31,C1832/32)

Toyota 4Runner Service Manual / Suspension / Suspension Control / Kinetic Dynamic Suspension System / Accumulator Solenoid Malfunction / Upside (C1831/31,C1832/32)

DESCRIPTION

The stabilizer control ECU receives information from the steering angle sensor, skid control ECU (speed signal) and yaw rate and acceleration sensor via CAN communication. Based on this information, the stabilizer control ECU turns the stabilizer control solenoid valve (built into the stabilizer control with accumulator housing assembly) on or off.

DTC Code	DTC Detection Condition	Trouble Area
C1831/31 C1832/32	Either condition is met: An open circuit signal is detected for 1 second continuously when current is not applied to the solenoid valve. A short circuit signal is detected 8 times continuously when current is applied to the solenoid valve.	Harness or connector Stabilizer control solenoid valve (Stabilizer control with accumulator housing assembly) Stabilizer control ECU

DTC Code

DTC Detection Condition

Trouble Area

C1831/31

C1832/32

Either condition is met:

An open circuit signal is detected for 1 second continuously when current is not applied to the solenoid valve.
A short circuit signal is detected 8 times continuously when current is applied to the solenoid valve.

Harness or connector
Stabilizer control solenoid valve (Stabilizer control with accumulator housing assembly)
Stabilizer control ECU

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM (ACCUMULATOR VALVE)

(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
Accumulator Valve (Downside)	Stabilizer control solenoid valve (for Lower Chamber)/ ON or OFF	ON: Stabilizer control solenoid valve closed OFF: Stabilizer control solenoid valve open	-
Accumulator Valve (Upside)	Stabilizer control solenoid valve (for Upper Chamber)/ ON or OFF	ON: Stabilizer control solenoid valve open OFF: Stabilizer control solenoid valve closed	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Accumulator Valve (Downside)

Stabilizer control solenoid valve (for Lower Chamber)/

ON or OFF

ON: Stabilizer control solenoid valve closed

OFF: Stabilizer control solenoid valve open

Accumulator Valve (Upside)

Stabilizer control solenoid valve (for Upper Chamber)/

ON or OFF

ON: Stabilizer control solenoid valve open

OFF: Stabilizer control solenoid valve closed

(g) Perform the Active Test of the stabilizer control ECU using the Techstream.

KDSS

Tester Display	Test Part	Control Range	Diagnostic Note
Accumulator Valve (Upside)	Stabilizer control solenoid valve (for Upper Chamber)	Valve ON / OFF	The operating sound of the solenoid (clicking sound) can be heard. ON: Data List ON OFF: Data List OFF When the Active Test is performed, the solenoid turns on for 3 seconds.
Accumulator Valve (Downside)	Stabilizer control solenoid valve (for Lower Chamber)	Valve ON / OFF	The operating sound of the solenoid (clicking sound) can be heard. ON: Data List ON OFF: Data List OFF When the Active Test is performed, the solenoid turns on for 3 seconds.

Tester Display

Test Part

Control Range

Diagnostic Note

Accumulator Valve (Upside)

Stabilizer control solenoid valve (for Upper Chamber)

Valve ON / OFF

The operating sound of the solenoid (clicking sound) can be heard.

ON: Data List ON

OFF: Data List OFF

When the Active Test is performed, the solenoid turns on for 3 seconds.

Accumulator Valve (Downside)

Stabilizer control solenoid valve (for Lower Chamber)

Valve ON / OFF

The operating sound of the solenoid (clicking sound) can be heard.

ON: Data List ON

OFF: Data List OFF

When the Active Test is performed, the solenoid turns on for 3 seconds.

(h) Check that the solenoid operating sound can be heard, and that the Data List display changes between ON and OFF in response to the Active Test.

OK:

Solenoid operating sound can be heard and display changes between ON and OFF in response to Active Test.

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.	CHECK HARNESS AND CONNECTOR (STABILIZER CONTROL ECU - STABILIZER CONTROL SOLENOID VALVE)

(a) Disconnect the stabilizer control ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F70-3 (SLAU) - O23-6 (SLAU)	Always	Below 1 Ω
F70-3 (SLAU) - Body ground	Always	10 kΩ or higher
F70-1 (SLAL) - O23-5 (SLAL)	Always	Below 1 Ω
F70-1 (SLAL) - Body ground	Always	10 kΩ or higher
O23-4 (AUG) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT STABILIZER CONTROL SOLENOID VALVE

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

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

Standard Resistance:

for DTC C1831/31 (for Upper Chamber)

Tester Connection	Condition	Specified Condition
5 (SLAL) - 4 (AUG)	25°C (77°F)	24.3 to 25.7 Ω

for DTC C1832/32 (for Lower Chamber)

Tester Connection	Condition	Specified Condition
6 (SLAU) - 4 (AUG)	25°C (77°F)	24.3 to 25.7 Ω

Text in Illustration

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

(1) for DTC C1831/31 (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 DTC C1832/32 (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 ECU

REPLACE STABILIZER CONTROL WITH ACCUMULATOR HOUSING ASSEMBLY

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