Last Modified: 11-29-2007 1.6 C
Service Category: Brake Section: Brake Control/Dynamic Control System
Model Year: 2008 Model: Sequoia Doc ID: RM0000028KR007X
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

C0273/13

Open in ABS Motor Relay Circuit

DTC

C1251/51

Open in Pump Motor Circuit

DESCRIPTION

The ABS motor relay (skid control ECU interior circuit) supplies the power to the ABS pump motor. While the ABS is activated, the ECU turns the motor relay ON and operates the ABS pump motor.

DTC Code

DTC Detection Condition

Trouble Area

C0273/13

When one of following conditions is met:

  1. Pump motor voltage is 2.0 V or more for 1 sec. or more at motor relay OFF.
  2. Pump motor voltage is (IG - 4.0 V) or less for 0.1 sec. or more at motor relay ON.
  3. After the end of the actuation of the motor relay, slow down condition of motor does not meet the specification.
  • ABS1 fuse
  • Harness or connector (+BM circuit)
  • VSC actuator (skid control ECU)

C1251/51

When any of following conditions detected with normal battery voltage (10 V or more):

  1. Open in pump motor power supply circuit or open in motor power supply circuit ground
  2. Motor stuck mechanically and does not operate
  3. Motor coil shorted and overcurrent flows
  • ABS1 fuse
  • VSC actuator (skid control ECU)

HINT:

C0273/13: The skid control ECU begins to detect these DTCs when the vehicle speed exceeds 15 km/h (9 mph).

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the VSC actuator assembly, perform zero point calibration BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION (2008 Sequoia) .

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (MOTOR RELAY)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream ON.

(d) Clear the DTC BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(e) Select the Active Test mode on the Techstream.

ABS/VSC/TRAC

Tester Display

Test Part

Control Range

Diagnostic Note

Motor Relay

ABS motor relay

Relay ON/OFF

Operating sound of motor can be heard

(f) Check the operation sound of the ABS motor when operating it with the Techstream.

OK:

The operation sound of the ABS motor can be heard.

OK

2.

RECONFIRM DTC

(a) Clear the DTC BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(b) Start the engine.

(c) Check if the same DTC is output BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

Result

Result

Proceed to

DTC is output

A

DTC is not output

B
A

3.

INSPECT FUSE (ABS1)

(a) Remove the ABS1 fuse from the engine room relay block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

ABS1 fuse

Always

Below 1 Ω
OK

4.

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

(a) Disconnect the A19 ECU connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A19-16 (+BM) - Body ground

Always

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A19-1 (GND1) - Body ground

Always

Below 1 Ω
OK