Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIQB
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: MF1A (TRANSFER / 4WD / AWD): ACTIVE TORQUE CONTROL 4WD SYSTEM: C1298; Linear Solenoid Circuit; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

C1298

Linear Solenoid Circuit

DESCRIPTION

The 4WD control ECU receives signals from each sensor to control clutch pressure to distribute torque according to the driving conditions.

DTC No.

DTC Detection Condition

Trouble Area

C1298

When the following continues for 1 second or more:

- With the current of 0.8 A or more, an open or short in the electromagnetic solenoid circuit occurs.

  • 4WD fuse
  • Wire harness and connector
  • Electromagnetic control coupling
  • 4WD control ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

HINT:

Check the condition of each related circuit connector before troubleshooting (See page 2016 - 2020 MY Sienna [12/2015 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - BATTERY)

(a) Disconnect the ECU connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

K1-9 (BSLC) - Body Ground

Always

11 to 14 V

Text in Illustration

*a

Rear view of wire harness connector

(to 4WD Control ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT ELECTRO MAGNETIC CONTROL COUPLING (ELECTROMAGNETIC SOLENOID)

(a) Disconnect the coupling connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (BSF) - 2 (SLC)

Always

2.2 to 2.6 Ω

1 (BSF) - Body ground

Always

10 kΩ or higher

2 (SLC) - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Electromagnetic Solenoid

NG

REPLACE ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (ELECTROMAGNETIC CONTROL COUPLING - 4WD CONTROL ECU)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K1-13 (SLC+) - 1 (BSF)

Always

Below 1 Ω

K1-32 (SLC-) - 2 (SLC)

Always

Below 1 Ω

K1-13 (SLC+) - Body ground

Always

10 kΩ or higher

K1-32 (SLC-) - Body ground

Always

10 kΩ or higher

OK

REPLACE 4WD CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR