Dtc Always On Malfunction In Abs

*: ABS warning light

When reading DTCs by SST (CHECK WIRE), if the ABS warning light remains ON, troubleshoot by following the inspection flow.

description DTC CHART

DTC No.

DTC Detecting Condition

Trouble Area

Always ON

When any of the following conditions are detected:

1. Malfunction in ECU internal circuit is identified.

2. ECU power source voltage is too high.

• Charging system

• Power source circuit

• ABS warning light circuit

• Skid control ECU

HINT:

HINT:

There is a possibility that the intelligent tester cannot be used when the ECU is abnormal. wiring diagram

2006 BRAKES Brake Control - Sequoia

2006 Sequoia Ecu
Fig. 33: DTC Always On Malfunction In ABS ECU Wiring Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

inspection procedure

1. CHECK DTC

2006 BRAKES Brake Control - Sequoia

RESULT:

RESULT PROCEED

Result

Proceed to

DTC is not output

A

DTC is output

B

B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS A: GO TO NEXT STEP.

2. CHECK SKID CONTROL ECU CONNECTOR SECURELY CONNECTED NG: CONNECT CONNECTOR CORRECTLY

OK: GO TO NEXT STEP.

3. CHECK TERMINAL VOLTAGE (SKID CONTROL ECU)

a. Disconnect the skid control ECU connector.

b. Turn the ignition switch to the ON position.

c. Measure the voltage between terminals IG1 and GND of the skid control ECU harness side connector.

OK: Voltage: 10 to 14 V NG: CHECK HARNESS OR CONNECTOR (ECU-IG FUSE - SKID CONTROL ECU)

2006 BRAKES Brake Control - Sequoia

Malfunction Ecu
Fig. 34: Disconnecting Skid Control ECU Connector Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: GO TO NEXT STEP.

4. CHECK BATTERY VOLTAGE

a. Check the battery positive voltage.

OK: Voltage: 10 to 14 V NG: CHECK CHARGING SYSTEM OK: GO TO NEXT STEP.

5. CHECK TC TERMINAL CIRCUIT OK: TC terminal circuit is normal

NG: REPAIR TC TERMINAL CIRCUIT OK: GO TO NEXT STEP.

6. CHECK ABS WARNING LIGHT

a. When using the intelligent tester:

2006 BRAKES Brake Control - Sequoia

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch to the ON position and push the intelligent tester main switch ON.

3. Select ACTIVE TEST mode on the intelligent tester.

4. Check that "ON" and "OFF" of the ABS warning light can be shown on the combination meter by the intelligent tester.

TEM REFERENCE

Item

Vehicle Condition / Test Details

Diagnostic Note

ABS WARN LIGHT

Turns ABS warning light ON / OFF

Observe combination meter

OK: ABS warning light operates.

b. When not using the intelligent tester:

1. Turn the ignition switch OFF.

2. Disconnect the connector from the skid control ECU.

3. Turn the ignition switch to the ON position.

4. Check the ABS warning light comes on.

OK: ABS warning light comes on. OK: REPLACE SKID CONTROL ECU NG: GO TO NEXT STEP.

7. CHECK COMBINATION METER

a. Perform combination meter troubleshooting (See HOW TO PROCEED WITH TROUBLESHOOTING ).

NG: REPAIR COMBINATION METER

OK: CHECK HARNESS CONNECTOR (COMBINATION METER - SKID CONTROL ECU)

DTC C0200/31: RIGHT FRONT WHEEL SPEED SENSOR SIGNAL; DTC C0205/32: LEFT FRONT WHEEL SPEED SENSOR SIGNAL; DTC C0210/33: RIGHT REAR WHEEL SPEED SENSOR SIGNAL; DTC C0215/34 :LEFT REAR WHEEL SPEED SENSOR SIGNAL

description

2006 BRAKES Brake Control - Sequoia

C0215 Sensor Signal
Fig. 35: Right Front Wheel Speed Sensor Description Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the ABS control system. The front and rear rotors have 48 serrations each. When the rotors rotate, the magnetic field emitted by the permanent magnet in the speed sensor generates AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.

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