Lexus ES manuals

Lexus ES: Linear Solenoid Power Supply System Malfunction (C120C)

Lexus ES (XZ10) Service Manual / Drivetrain / Gf1a (transfer / 4wd / Awd) / Dynamic Torque Control Awd System / Linear Solenoid Power Supply System Malfunction (C120C)

DESCRIPTION

This DTC is output by the 4WD ECU assembly if a malfunction occurs in the linear solenoid power supply system.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C120C

Linear Solenoid Power Supply System Malfunction

  • When the 4WD relay is on, the 4WD relay monitor remains off for 1 second or more while the voltage at the IG1 terminal is 9.5 V or more
  • When the 4WD relay is on, the 4WD relay monitor remains off for 1 second or more while the voltage at the IG1 terminal is less than 9.5 V
  • While the 4WD relay is off, the 4WD relay monitor remains on for 1 second or more immediately after the engine switch is turned on (IG)
  • Wire harness or connector
  • 4WD ECU assembly
DTC Detection Conditions: C120C
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

When the 4WD relay is on and the voltage at the IG1 terminal is 9.5 V or more

-

-

When the 4WD relay is on and the voltage at the IG1 terminal is less than 9.5 V

-

-

While the 4WD relay is off

-

-

Malfunction Status

The 4WD relay monitor remains off

-

The 4WD relay monitor remains on immediately after the engine switch is turned on (IG)

-

-

Detection Time

1 second or more

1 second or more

1 second or more

Number of Trips

1 trip

1 trip

1 trip

HINT:

DTC will be output when conditions for any of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

(a) Disconnect the G131 4WD ECU assembly connector.

*a

Front view of wire harness connector

(to 4WD ECU Assembly)

(b) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G131-3 (IG1) - Body ground

Engine switch on (IG)

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the engine switch off.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G131-4 (GND) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

RECONFIRM DTC

(a) Clear the DTC.

Chassis > Four Wheel Drive > Clear DTCs

(b) Turn the engine switch on (IG).

(c) Check that no DTCs other than DTC C120C have been output.

Chassis > Four Wheel Drive > Trouble Codes

Result

Proceed to

DTCs other than DTC C120C are not output

A

DTCs other than DTC C120C are output

B

A

REPLACE 4WD ECU ASSEMBLY

B

REPAIR CIRCUIT INDICATED BY OUTPUT CODE

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