Inspection Procedure

NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (see INITIALIZATION ).

HINT:

Start the inspection from "CHECK HARNESS AND CONNECTOR" when using the Techstream and start from "PERFORM TEST MODE" when not using the Techstream.

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC (see CHECK FOR INTERMITTENT PROBLEMS ).

ABS/VSC/TRAC

ABS/VSC/TRAC REFERENCE CHART

Tester Display	Measurement Item/Range	Normal Condition
FR Speed Open	Front speed sensor RH open detection / ERROR or NORMAL	ERROR: Momentary interruption NORMAL: Normal
FL Speed Open	Front speed sensor LH open detection / ERROR or NORMAL	ERROR: Momentary interruption NORMAL: Normal

OK: There are no momentary interruptions.

HINT:

Perform the above inspection before removing the sensor and connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SPEED SENSOR CIRCUIT)

OK: Go to next step

READ VALUE OF TECHSTREAM (FRONT SPEED SENSOR)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).

Select the Data List mode on the Techstream.

ABS/VSC/TRAC

ABS/VSC/TRAC REFERENCE CHART

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FR Wheel Speed	Front wheel speed sensor RH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Actual wheel speed	Similar speed as indicated on speedometer
FL Wheel Speed	Front wheel speed sensor LH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Actual wheel speed	Similar speed as indicated on speedometer

Check that the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer are almost the same when driving the vehicle.

OK: The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed.

ABS/VSC/TRAC

ABS/VSC/TRAC REFERENCE CHART

Tester Display	Measurement Item/Range	Normal Condition
FR Wheel Direction	Front wheel direction RH / FORWARD or BACK	FORWARD: Forward BACK: Back
FL Wheel Direction	Front wheel direction LH / FORWARD or BACK	FORWARD: Forward BACK: Back

Check that the sensor signal conforms to the wheel direction.
OK: The wheel direction is displayed.

NG: Go to step 5

OK: Go to next step

PERFORM TEST MODE (SIGNAL CHECK)
1. Clear the DTC (see DTC CHECK / CLEAR ).
2. Perform sensor signal check in "TEST MODE PROCEDURE " .
  OK: All Test Mode DTCs are erased.
NG: Go to step 5

OK: Go to next step

RECONFIRM DTC

Clear the DTC (see DTC CHECK / CLEAR ).
Turn the engine switch on (IG).
Drive the vehicle at the speed of 32 km/h (20 mph) or more for 60 seconds or more.

Check if the same DTCs are recorded (see DTC CHECK / CLEAR ).

Result

RESULT CHART

Result	Proceed To
DTCs (C0200/31 and C0205/32) are not output	A
DTCs (C0200/31 and C0205/32) are output	B

HINT:

If troubleshooting has been carried out according to the "PROBLEM SYMPTOMS TABLE", refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE ).

B: Go to step 10

A: END

INSPECT FRONT SPEED SENSOR INSTALLATION
1. Check the sensor installation.
  OK: There is no clearance between the sensor and the front steering knuckle.
  
  NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE ).
  
  Fig 1: Inspecting Front Speed Sensor Installation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: SECURELY REINSTALL FRONT SPEED SENSOR (See INSTALLATION )

OK: Go to next step

CHECK FRONT SPEED SENSOR WIRE

Disconnect the front speed sensor wire RH.
Disconnect the front speed sensor wire LH.

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

Standard Resistance:

for RH

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
"A"-2 (FR+) - "B"-2	Always	Below 1 Ω
"A"-2 (FR+) - "B"-1	Always	10 kΩ or higher
"A"-2 (FR+) - Body ground	Always	10 kΩ or higher
"A"-1 (FR-) - "B"-1	Always	Below 1 Ω
"A"-1 (FR-) - "B"-2	Always	10 kΩ or higher
"A"-1 (FR-) - Body ground	Always	10 kΩ or higher

for LH

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
"A"-1 (FL+) - "B"-1	Always	Below 1 Ω
"A"-1 (FL+) - "B"-2	Always	10 kΩ or higher
"A"-1 (FL+) - Body ground	Always	10 kΩ or higher
"A"-2 (FL-) - "B"-2	Always	Below 1 Ω
"A"-2 (FL-) - "B"-1	Always	10 kΩ or higher
"A"-2 (FL-) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying Front Speed Sensor RH And LH Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE ).

NG: REPLACE FRONT SPEED SENSOR WIRE

OK: Go to next step

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

Disconnect the A19 and A21 ECU connectors.
Disconnect the A55 sensor connector.
Disconnect the A5 sensor connector.

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

Standard Resistance:

for RH

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
A19-16 (FR+) - A55-2 (FR+)	Always	Below 1 Ω
A19-15 (FR-) - A55-1 (FR-)	Always	Below 1 Ω
A19-16 (FR+) - Body ground	Always	10 kΩ or higher
A19-15 (FR-) - Body ground	Always	10 kΩ or higher

for LH

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
A21-16 (FL+) - A5-2 (FL+)	Always	Below 1 Ω
A21-15 (FL-) - A5-1 (FL-)	Always	Below 1 Ω
A21-16 (FL+) - Body ground	Always	10 kΩ or higher
A21-15 (FL-) - Body ground	Always	10 kΩ or higher

Fig 3: Identifying A19, A21, A55 And A5 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK SKID CONTROL ECU (SENSOR INPUT VOLTAGE)

Reconnect the A19 and A21 ECU connectors.
Disconnect the A55 sensor connector.
Disconnect the A5 sensor connector.
Turn the engine switch on (IG).

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Condition	Specified Condition
A55-2 (FR+) - Body ground	Engine switch on (IG)	6.7 to 14 V
A5-2 (FL+) - Body ground	Engine switch on (IG)	6.7 to 14 V

Fig 4: Identifying A55 And A5 Sensor Connector Terminals

NG: REPLACE SKID CONTROL ECU (See REMOVAL )

OK: Go to next step

RECONFIRM DTC

Clear the DTC (see DTC CHECK / CLEAR ).
Start the engine.
Drive the vehicle at the speed of 32 km/h (20 mph) or more for 60 seconds or more.

Check if the same DTCs are recorded (see DTC CHECK / CLEAR ).

HINT:

Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result

RESULT CHART

Result	Proceed To
DTCs (C0200/31 and C0205/32) are output	A
DTCs (C0200/31 and C0205/32) are not output	B

HINT:

If troubleshooting has been carried out according to the "PROBLEM SYMPTOMS TABLE", refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE ).

B: END

A: Go to next step

REPLACE FRONT SPEED SENSOR
1. Replace the front speed sensor (see INSTALLATION ).
  NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE ).
  
  HINT:
  
  The front speed sensor is a component of the front axle hub sub-assembly. If the sensor is replaced, replace the hub and bearing assembly.

RECONFIRM DTC

Clear the DTC (see DTC CHECK / CLEAR ).
Start the engine.
Drive the vehicle at the speed of 32 km/h (20 mph) or more for 60 seconds or more.

Check if the same DTCs are recorded (see DTC CHECK / CLEAR ).

HINT:

Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result

RESULT CHART

Result	Proceed To
DTCs (C0200/31 and C0205/32) are output	A
DTCs (C0200/31 and C0205/32) are not output	B

HINT:

If troubleshooting has been carried out according to the "PROBLEM SYMPTOMS TABLE", refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE ).

B: END

A: REPLACE SKID CONTROL ECU (See REMOVAL )