Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Linear Solenoid Circuit (C1298)

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Drivetrain / Mf1a (transfer / 4wd / Awd) / Dynamic Torque Control Awd System / Linear Solenoid Circuit (C1298)

DESCRIPTION

The 4WD ECU assembly receives signals from each sensor. The signals are used to control the clutch fluid pressure to vary the distribution of torque in accordance with 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:

  • The voltage at terminal IG1 is 9.5 V or more.
  • The target current for the 4WD linear solenoid (electro magnetic control coupling sub-assembly) is either 0 A or 0.8 A or more.
  • An open or short is detected in the linear solenoid circuit.
  • Wire harness and connector
  • 4WD linear solenoid (Electro magnetic control coupling sub-assembly)
  • 4WD ECU assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When the 4WD ECU assembly is replaced with a known good one from another vehicle, it is necessary to perform calibration.

Click here

HINT:

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (4WD ECU ASSEMBLY - ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY)

(a) Disconnect the R10 4WD ECU assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R10-2 (SLC+) - R10-1 (SLC-)

20°C (68°F)

1.75 to 2.15 Ω

R10-2 (SLC+) - Body ground

Always

10 kΩ or higher

R10-1 (SLC-) - Body ground

Always

10 kΩ or higher
OK

REPLACE 4WD ECU ASSEMBLY

NG

2.

INSPECT ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY

(a) Disconnect the T4 4WD linear solenoid (electro magnetic control coupling sub-assembly) connector.

*a

Component without harness connected

(4WD Linear Solenoid (Electro Magnetic Control Coupling Sub-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)

1.75 to 2.15 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 ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY

    Steering Angle Sensor (C1297)
    DESCRIPTION The 4WD ECU assembly determines that the vehicle is turning based on the signals sent from the steering sensor. The steering sensor signal is sent to the 4WD ECU assembly via CAN communica ...

    Cancellation of 4WD Control (C1299)
    DESCRIPTION This DTC is stored if the heat generated by the transmission coupling assembly exceeds a certain amount or the estimated oil temperature of the transfer exceeds a certain amount while driv ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Noise Filter (w/ Rear No. 2 Seat): Installation
    INSTALLATION PROCEDURE 1. INSTALL RADIO SETTING CONDENSER (a) Engage the claw to install a new terminal cover to the wire harness. NOTICE: Make sure to hold the crimping side of the terminal when installing the wire harness to the terminal cover. Make sure not to bend the exposed wire when ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Owners Manual > Driving procedures: EV drive mode
    In EV drive mode, electric power is supplied by the hybrid battery (traction battery), and only the electric motor (traction motor) is used to drive the vehicle. This mode allows you to drive in residential areas early in the morning and late at night, or in indoor parking lots, etc., witho ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2026 Copyright www.lexusrx.net
    0.0102