Dtc C1791 Absorber Control Switch Circuit (Test Mode Dtc)

Suspension. Land Cruiser. Urj200, 202 Grj200 Vdj200
Suspension Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (SPORT SWITCH, COMFORT SWITCH)

TEST MODE INSPECTION

INSPECT SUSPENSION CONTROL SWITCH (DAMPING FORCE CONTROL SWITCH)

CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - SWITCH AND BODY GROUND)

DTC C1791 Absorber Control Switch Circuit (Test Mode DTC)


DESCRIPTION

This circuit is used for sending the signal to the suspension control ECU to switch to the damping mode selected by the damping force control switch.

DTC Code
Detection Condition
Trouble Area
C1791
The test mode procedure is performed.
  1. Harness or connector
  2. Suspension control switch (Damping forcer control switch)
  3. Suspension control ECU

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1791 Absorber Control Switch Circuit (Test Mode Dtc)


INSPECTION PROCEDURE

NOTICE:
  1. Before performing troubleshooting, inspect the connectors of related circuits.
  2. If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed (Click here).
1.READ VALUE USING INTELLIGENT TESTER (SPORT SWITCH, COMFORT SWITCH)

  1. Turn the engine switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and the tester on.

  1. Enter the following menus: Chassis / AHC / Data List.

  1. According to the display on the tester, read the Data List.

    AHC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    SPORT Switch
    		Damping force control switch (SPORT) /
    ON or OFF
    		ON: SPORT
    OFF: NORMAL or COMFORT
    		-
    COMFORT Switch
    		Damping force control switch (COMFORT) /
    ON or OFF
    		ON: COMFORT
    OFF: NORMAL or SPORT
    		-
OK:
On the tester screen, item changes between ON and OFF according to switch operation.


NG
Go to step 3
OK


2.TEST MODE INSPECTION

  1. Refer to the Test Mode Procedure and perform the signal check. Check that test mode DTC C1791 is cleared (Click here).

    Result
    Result
    		Proceed to
    DTC C1791 is not cleared
    		A
    DTC C1791 is cleared
    		B


B
USE SIMULATION METHOD TO CHECK (Click here)
A

REPLACE SUSPENSION CONTROL ECU (Click here)

3.INSPECT SUSPENSION CONTROL SWITCH (DAMPING FORCE CONTROL SWITCH)

  1. Remove the suspension control switch (Click here).



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1791 Absorber Control Switch Circuit (Test Mode Dtc)

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    5 (ECU2) - 16 (E)
    		COMF
    		Below 1 Ω
    Except COMF
    		10 kΩ or higher
    6 (ECU1) - 16 (E)
    		SPORT
    		Below 1 Ω
    Except SPORT
    		10 kΩ or higher


NG
REPLACE SUSPENSION CONTROL SWITCH (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - SWITCH AND BODY GROUND)

Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1791 Absorber Control Switch Circuit (Test Mode Dtc)

  1. Disconnect the K34 ECU connector.

  1. Disconnect the V4 switch connector.

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

    Standard Resistance:
    Tester Connection
    		 Condition
    		Specified Condition
    K34-2 (TSW1) - V4-6 (ECU1)
    		Always
    		Below 1 Ω
    K34-2 (TSW1) - Body ground
    		Always
    		10 kΩ or higher
    K34-9 (TSW2) - V4-5 (ECU2)
    		Always
    		Below 1 Ω
    K34-9 (TSW2) - Body ground
    		Always
    		10 kΩ or higher
    V4-16 (E) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SUSPENSION CONTROL ECU (Click here)