Lexus ES manuals

Lexus ES: Linear Solenoid Circuit (C1298)

DESCRIPTION

The 4WD ECU assembly receives signals from each sensor to control clutch fluid pressure for limiting the center differential operation, which distributes torque according to the driving conditions.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1298

Linear Solenoid Circuit

When all of the following continue for 1 second or more:

  • IG1 voltage is 9.5 V or more.
  • The current requested by the 4WD linear solenoid (transmission coupling assembly) is either 0 A or greater than 0.8 A.
  • Open or short occurs in the 4WD linear solenoid circuit.
  • Wire harness or connector
  • 4WD linear solenoid (Transmission coupling assembly)
  • 4WD ECU assembly
DTC Detection Conditions: C1298
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

IG1 voltage is 9.5 V or more, the current requested by the 4WD linear solenoid (transmission coupling assembly) is 0 A.

-

IG1 voltage is 9.5 V or more, the current requested by the 4WD linear solenoid (transmission coupling assembly) is greater than 0.8 A.

-

Malfunction Status

Short occurs in the 4WD linear solenoid circuit.

-

Open occurs in the 4WD linear solenoid circuit.

-

Detection Time

1 second or more

1 second or more

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above is met.

WIRING DIAGRAM

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (4WD ECU ASSEMBLY - TRANSMISSION COUPLING ASSEMBLY)

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

*a

Front view of wire harness connector

(to 4WD ECU Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G131-2 (SLC+) - G131-1 (SLC-)

20°C (68°F)

2.2 to 2.6 Ω

G131-2 (SLC+) - Body ground

Always

10 kΩ or higher

G131-1 (SLC-) - Body ground

Always

10 kΩ or higher

OK

REPLACE 4WD ECU ASSEMBLY

NG

2.

INSPECT TRANSMISSION COUPLING ASSEMBLY

(a) Disconnect the c1 4WD linear solenoid (transmission coupling assembly) connector.

*a

Component without harness connected

(4WD Linear Solenoid (Transmission Coupling Assembly))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (BSF) - 2 (SLC)

20°C (68°F)

2.2 to 2.6 Ω

1 (BSF) - Body ground

Always

10 kΩ or higher

2 (SLC) - Body ground

Always

10 kΩ or higher

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

NG

REPLACE TRANSMISSION COUPLING ASSEMBLY

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