Dtc C1851/51 Low Pressure Malfunction In Upside Of Kdss System


DESCRIPTION

INSPECTION PROCEDURE

INSPECT FOR FLUID LEAK

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

INSPECT STABILIZER CONTROL SOLENOID VALVE (CHECK IF VALVE STUCK)

INSPECT FOR CLOGS IN HYDRAULIC CIRCUIT

RECONFIRM DTC

DTC C1851/51 Low Pressure Malfunction in Upside of KDSS System

DTC C1853/53 High Pressure Malfunction in Upside of KDSS System


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.
  1. Hydraulic circuit
  2. Harness or connector
  3. Accumulator pressure sensor or stabilizer control solenoid valve (Stabilizer control with accumulator housing assembly)
  4. 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.

INSPECTION PROCEDURE

HINT:
  1. When these DTCs are output, perform the hydraulic circuit inspection first (LandCruiser RM0000038UA01EX_01_0004.html).
  2. If the DTCs cannot be cleared even after the hydraulic circuit inspection, perform the electrical circuit inspection by following the procedures below.
1.INSPECT FOR FLUID LEAK

  1. Inspect for fluid leaks (LandCruiser RM0000038UA01EX_01_0004.html).

    OK:
    No fluid leaks.


NG
REPAIR FLUID LEAK OR REPLACE PARTS AS NECESSARY
OK


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

  1. Check if DTC C1812/12, C1831/31 and/or C1832/32 is output (LandCruiser RM000001N9I01KX.html).

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


B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (LandCruiser RM000001N8Y01VX.html)
A


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

  1. Disconnect the Stabilizer control with accumulator housing assembly connector.



  1. Check for an operating sound of the Stabilizer control solenoid valve.



      Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1851/51 Low Pressure Malfunction In Upside Of Kdss System

    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. Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1851/51 Low Pressure Malfunction In Upside Of Kdss System

    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)


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


4.INSPECT FOR CLOGS IN HYDRAULIC CIRCUIT

  1. Bleed air and check that the hydraulic circuit is not clogged (LandCruiser RM0000038U7010X.html).

    OK:
    Hydraulic circuit is not clogged.


NG
REPAIR HYDRAULIC CIRCUIT MALFUNCTIONS OR REPLACE PARTS AS NECESSARY
OK


5.RECONFIRM DTC

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

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

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


B
REPLACE STABILIZER CONTROL ECU (LandCruiser RM000002KLG00RX.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)