Suspension Control. Dtc C1831/31 Accumulator Solenoid Malfunction / Upside

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (ACCUMULATOR VALVE)

RECONFIRM DTC

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

INSPECT STABILIZER CONTROL SOLENOID VALVE

DTC C1831/31 Accumulator Solenoid Malfunction / Upside

DTC C1832/32 Accumulator Solenoid Malfunction / Downside

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 a second continuously when current is not applied to the solenoid valve. A short circuit signal is detected 8 seconds 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

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System.
Dtc
C1831/31 Accumulator Solenoid Malfunction / Upside

INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (ACCUMULATOR VALVE)

Turn the ignition switch off.

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON.

Turn the intelligent tester on.

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

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
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	-

Perform the Active Test of the stabilizer control ECU using the intelligent tester.

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.

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

OK

2.RECONFIRM DTC

Clear the DTCs (LandCruiser RM000001N9I01KX.html)

Check for DTCs (LandCruiser RM000001N9I01KX.html).
Result
Result
Proceed to
DTC is output
A
DTC is not output
B

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

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

REPLACE STABILIZER CONTROL ECU (LandCruiser RM000002KLG00RX.html)

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

Disconnect the stabilizer control ECU connector.

Disconnect the Stabilizer control with accumulator housing assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G123-3 (SLAU) - R20-6 (SLAU)	Always	Below 1 Ω
G123-3 (SLAU) - Body ground	Always	10 kΩ or higher
G123-1 (SLAL) - R20-5 (SLAL)	Always	Below 1 Ω
G123-1 (SLAL) - Body ground	Always	10 kΩ or higher
R20-4 (AUG) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.INSPECT STABILIZER CONTROL SOLENOID VALVE

Disconnect the Stabilizer control with accumulator housing assembly connector.

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

Standard Resistance:
C1831/31 (for Upper Chamber)
Tester Connection
Condition
Specified Condition
5 (SLAL) - 4 (AUG)
25°C (77°F)
24.3 to 25.7 Ω
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)

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 (LandCruiser RM000002KK0011X.html)

REPLACE STABILIZER CONTROL ECU (LandCruiser RM000002KLG00RX.html)