Dtc C1782 Power Source Voltage Malfunction

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (IG VOLTAGE)

RECONFIRM DTC OUTPUT

READ VALUE USING GTS (+B POWER SOURCE VOLTAGE, +B2 POWER SOURCE VOLTAGE)

INSPECT FUSE (AHC-B, AHC-B NO. 2)

CHECK HARNESS AND CONNECTOR (BATTERY - SUSPENSION CONTROL ECU)

CHECK HARNESS AND CONNECTOR (BATTERY - ECU AND BODY GROUND)

DTC C1782 Power Source Voltage Malfunction


DESCRIPTION


DTC Code
Detection Condition
Trouble Area
C1782
While the engine switch is on (IG), voltage at terminal IG, BAT and/or BAT2 is 10 V or less, or 16 V or more for 0.5 seconds.
  1. Battery
  2. Charging system
  3. Harness or connector
  4. AHC-B fuse
  5. AHC-B No. 2 fuse
  6. Suspension control ECU

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1782 Power Source Voltage Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. Even if DTC C1781 is stored at the same time, perform the inspection for DTC C1782 first.
  2. Before performing troubleshooting, inspect the connectors of related circuits.
  3. 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 GTS (IG VOLTAGE)

  1. Connect the GTS to the DLC3.

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

  1. Read the "IG Power Source Voltage" item in the Data List.

    AHC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    IG Power Source Voltage
    		Power supply voltage /
    min.: 0 V
    max.: 255 V
    		Engine switch on (IG): 11 to 14 V
    		-
    OK:
    11 to 14 V


NG
Go to step 6
OK


2.RECONFIRM DTC OUTPUT

  1. Clear the DTCs (Click here).

  1. Check for DTCs.

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


B
USE SIMULATION METHOD TO CHECK (Click here)
A


3.READ VALUE USING GTS (+B POWER SOURCE VOLTAGE, +B2 POWER SOURCE VOLTAGE)

  1. Connect the GTS to the DLC3.

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

  1. Read the "+B Power Source Voltage" and "+B2 Power Source Voltage" items in the Data List.

    AHC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    +B Power Source Voltage
    		Power supply for absorber control actuator /
    min.: 0 V
    max.: 255 V
    		Engine switch on (IG): 11 to 14 V
    		-
    +B2 Power Source Voltage
    		Power supply for No. 1 height control valve and front suspension control valve /
    min.: 0 V
    max.: 255 V
    		Engine switch on (IG): 11 to 14 V
    		-
    OK:
    11 to 14 V


NG
Go to step 4
OK

REPLACE SUSPENSION CONTROL ECU (Click here)

4.INSPECT FUSE (AHC-B, AHC-B NO. 2)

  1. Remove the AHC-B and AHC-B No. 2 fuses from the cowl side junction block RH.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    AHC-B fuse
    		Always
    		Below 1 Ω
    AHC-B No. 2 fuse
    		Always
    		Below 1 Ω


NG
CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK


5.CHECK HARNESS AND CONNECTOR (BATTERY - SUSPENSION CONTROL ECU)

  1. Disconnect the K34 and K35 ECU connectors.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1782 Power Source Voltage Malfunction

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    K34-3 (BAT2) - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    K35-1 (BAT) - Body ground
    		Engine switch on (IG)
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SUSPENSION CONTROL ECU (Click here)

6.CHECK HARNESS AND CONNECTOR (BATTERY - ECU AND BODY GROUND)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1782 Power Source Voltage Malfunction

  1. Disconnect the K34 ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    K34-5 (IG) - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    Result
    Result
    		Proceed to
    OK
    		A
    NG (1UR-FE)
    		B
    NG (1VD-FTV)
    		C
    NG (3UR-FE)
    		D


B
BATTERY VOLTAGE IS LOW OR CHARGING SYSTEM HAS MALFUNCTION

C
BATTERY VOLTAGE IS LOW OR CHARGING SYSTEM HAS MALFUNCTION

D
BATTERY VOLTAGE IS LOW OR CHARGING SYSTEM HAS MALFUNCTION
A

REPLACE SUSPENSION CONTROL ECU (Click here)