Dtc C1745/45 Exhaust Solenoid


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (EXHAUST SOLENOID)

CHECK HARNESS AND CONNECTOR (EXHAUST SOLENOID VALVE - SUSPENSION CONTROL ECU)

INSPECT HEIGHT CONTROL COMPRESSOR (EXHAUST SOLENOID VALVE)

DTC C1745/45 Exhaust Solenoid


DESCRIPTION

The suspension control ECU operates the exhaust solenoid valve (height control compressor), releases the air from the height control cylinder assembly (pneumatic cylinder) and lowers the vehicle height.
When the vehicle height is lowered, the suspension control ECU opens the height control valve and then operates the exhaust solenoid valve to release compressed air to the outside.
The exhaust solenoid valve is on the compressor unit and has only one valve.

DTC Code
DTC Detection Condition
Trouble Area
C1745/45
Either condition is met:
  1. With the exhaust solenoid valve not activated, an open signal of the exhaust solenoid valve is detected for 1 second or more.
  2. With the exhaust solenoid valve activated, a short signal of the exhaust solenoid valve is detected 8 times successively.
  1. Harness or connector
  2. Exhaust solenoid valve (Height control compressor)
  3. Suspension control ECU
HINT:
  1. Once the suspension control ECU stores DTC C1745/45 in memory, vehicle height control is suspended until a normal signal is input to the suspension control ECU from the exhaust solenoid valve. However, control is resumed if the ignition switch is turned off and then to ON again.
  2. Malfunction in the exhaust solenoid valve:
    Height control indicator N comes on or blinks and HI and LO do not come on by operating the height control switch "up" or "down".

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1745/45 Exhaust Solenoid


INSPECTION PROCEDURE

NOTICE:
When replacing the suspension control ECU, perform registration (LandCruiser RM000003X4500TX.html).
HINT:
If DTC C1782/82 is output at the same time as C1745/45, perform the inspection necessary for DTC C1782/82 first (LandCruiser RM000001N9301JX.html).
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (EXHAUST SOLENOID)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / Air suspension / Active Test.

    Air Suspension
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Exhaust Solenoid
    		Exhaust solenoid valve
    		ON or OFF
    1. The operating sound of the solenoid (clicking sound) can be heard.
    2. When the Active Test is performed, Exhaust Solenoid in the Data List changes between ON and OFF accordingly.
    OK:
    Operation of solenoid (clicking sound) can be heard.
    Result
    Result
    		Proceed to
    NG
    		A
    OK (When troubleshooting according to problem symptoms table)
    		B
    OK (When troubleshooting according to DTC chart)
    		C


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000001SGQ021X.html)

C
USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)
A


2.CHECK HARNESS AND CONNECTOR (EXHAUST SOLENOID VALVE - SUSPENSION CONTROL ECU)

  1. Disconnect the S10 exhaust solenoid valve connector.

  1. Disconnect the R19 suspension control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    S10-2 (L) - R19-9 (SLEX)
    		 Always
    		Below 1 Ω
    S10-2 (L) - Body ground
    		 Always
    		 10 kΩ or higher
    S10-1 (B) - Body ground
    		 Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT HEIGHT CONTROL COMPRESSOR (EXHAUST SOLENOID VALVE)

  1. Turn the ignition switch off.

  1. Remove the height control compressor (LandCruiser RM000002BGX00QX.html).



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1745/45 Exhaust Solenoid

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2 (L) - 1 (B)
    		20°C (68°F)
    		10 to 14 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (Exhaust Valve)

  1. Connect the positive (+) lead of the battery to terminal 2 (L) and the negative (-) lead to terminal 1 (B) of the solenoid valve connector. Then check that the valve makes an operating sound.

    OK:
    Operation of solenoid (clicking sound) can be heard.


NG
REPLACE HEIGHT CONTROL COMPRESSOR ASSEMBLY (LandCruiser RM000002BGX00QX.html)
OK

REPLACE SUSPENSION CONTROL ECU (LandCruiser RM000002BGR01UX.html)