Inspection Procedure

NOTE: When replacing the skid control ECU, perform zero point calibration and store system information (See CALIBRATION ).

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

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

ABS/VSC/TRAC

TESTER DISPLAY REFERENCE CHART

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FR Speed Open	FR speed sensor open detection/ERROR or NORMAL	ERROR: Momentary interruption NORMAL: Normal	-
FL Speed Open	FL speed sensor open detection/ERROR or NORMAL	ERROR: Momentary interruption NORMAL: Normal	-

Result

RESULT REFERENCE

Result	Proceed to
There are momentary interruptions	A
There are no momentary interruptions	B
There is a constant open circuit (for 2WD)	C
There is a constant open circuit (for 4WD)	D

HINT:

Perform the above inspection before removing the sensor and connector.

B : Go to step 4

C : Go to step 7

D : Go to step 14

A : Go to next step

REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)
1. Turn the engine switch off.
2. Repair or replace the harness or connector.
3. Check for any momentary interruption between the skid control ECU and the front speed sensor (See CHECK FOR INTERMITTENT PROBLEMS ).
4. Check that there is no momentary interruption.

RECONFIRM DTC

Turn the engine switch off.
Clear the DTCs (See DTC CHECK/CLEAR ).
Start the engine.
Drive the vehicle at the speed of 32 km/h (20 mph) or more for at least 60 seconds.

Check if the same DTC is recorded (See DTC CHECK/CLEAR ).

Result

RESULT REFERENCE

Result	Proceed to
DTCs (C0200/31 and/or 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

READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

Turn the engine switch off.
Connect the Techstream to the DLC3.
Start the engine.

Select the Data List mode on the Techstream (See DATA LIST/ACTIVE TEST ).

ABS/VSC/TRAC

TESTER DISPLAY REFERENCE CHART

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FR Wheel Speed	FR wheel speed sensor reading/min.: 0 km/h (0 mph), max.: 326.4 km/h (202 mph)	Actual wheel speed	Similar speed as indicated on speedometer
FL Wheel Speed	FL wheel speed sensor reading/min.: 0 km/h (0 mph), max.: 326.4 km/h (202 mph)	Actual wheel speed	Similar speed as indicated on speedometer

Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.

HINT:

Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart (See ON-VEHICLE INSPECTION ).

OK:

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

ABS/VSC/TRAC

TESTER DISPLAY REFERENCE CHART

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FR Wheel Direction	FR wheel direction/FORWARD or BACK	FORWARD: Forward BACK: Backward	-
FL Wheel Direction	FL wheel direction/FORWARD or BACK	FORWARD: Forward BACK: Backward	-

Check that the sensor signal conforms to the wheel rotation direction.

OK:

The correct wheel rotation direction is displayed.

Result

RESULT REFERENCE

Result	Proceed to
OK	A
NG (for 2WD)	B
NG (for 4WD)	C

B : Go to step 7

C : Go to step 14

A : Go to next step

PERFORM TEST MODE (SIGNAL CHECK)

Turn the engine switch off.

Perform sensor check in Test Mode Procedure (See TEST MODE PROCEDURE ).

OK:

All Test Mode DTCs are cleared.

Result

RESULT REFERENCE

Result	Proceed to
OK	A
NG (for 2WD)	B
N6 (for 4WD)	C

B : Go to step 7

C : Go to step 14

A : Go to next step

RECONFIRM DTC

Turn the engine switch off.
Clear the DTCs (See DTC CHECK/CLEAR ).
Start the engine.
Drive the vehicle at the speed of 32 km/h (20 mph) or more for at least 60 seconds.

Check if the same DTC is recorded (See DTC CHECK/CLEAR ).

Result

RESULT REFERENCE

Result	Proceed to
DTCs (C0200/31 and C0205/32) are not output	A
DTCs (C0200/31 and/or C0205/32) are output (for 2WD)	B
DTCs (C0200/31 and/or C0205/32) are output (for 4WD)	C

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 12

C : Go to step 20

A : CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (See DIAGNOSIS SYSTEM )

CHECK FRONT SPEED SENSOR INSTALLATION
1. Turn the engine switch off.
2. Check the speed sensor installation.
  OK:
  
  There is no clearance between the sensor and the front steering knuckle.
  
  NOTE: Check the speed sensor signal after the installation (See TEST MODE PROCEDURE ).
NG : INSTALL FRONT SPEED SENSOR CORRECTLY (See INSTALLATION )

Fig 1: Checking Front Speed Sensor Installation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to next step

CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)

Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the skid control sensor wire.

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

Standard resistance:

for RH

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
t1 ("A"-2) - t1 ("B"-1)	Always	Below 1 Ω
t1 ("A"-2) - t1 ("B"-2)	Always	10 kΩ or higher
t1 ("A"-2) - Body ground	Always	10 kΩ or higher
t1 ("A"-1) - t1 ("B"-2)	Always	Below 1 Ω
t1 ("A"-1) - t1 ("B"-1)	Always	10 kΩ or higher
t1 ("A"-1) - Body ground	Always	10 kΩ or higher

for LH

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
m1 ("A"-2) - m1 ("B"-1)	Always	Below 1 Ω
ml ("A"-2) - ml ("B"-2)	Always	10 kΩ or higher
ml ("A"-2) - Body ground	Always	10 kΩ or higher
m1 ("A"-1) - m1 ("B"-2)	Always	Below 1 Ω
m1 ("A"-1) - m1 ("B"-1)	Always	10 kΩ or higher
ml ("A"-1) - Body ground	Always	10 kΩ or higher

Fig 2: Checking Harness And Connector (Skid Control Sensor Wire)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NG : REPLACE SKID CONTROL SENSOR WIRE

OK : Go to next step

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

Reconnect the skid control sensor wire.
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the skid control ECU connector and the front speed sensor connector.

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

Standard resistance:

for RH

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
A58-8 (FR+) - t1-2 (FR+)	Always	Below 1 Ω
A58-8 (FR+) - Body ground	Always	10 kΩ or higher
A58-7 (FR-) - t1-1 (FR-)	Always	Below 1 Ω
A58-7 (FR-) - Body ground	Always	10 kΩ or higher

for LH

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
A58-9 (FL+) - m1-2 (FL+)	Always	Below 1 Ω
A58-9 (FL+) - Body ground	Always	10 kΩ or higher
A58-10 (FL-) - m1-1 (FL-)	Always	Below 1 Ω
A58-10 (FL-) - Body ground	Always	10 kΩ or higher

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Checking Harness And Connector (Skid Control ECU - Front Speed Sensor)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to next step

INSPECT SKID CONTROL ECU (SENSOR INPUT)

Reconnect the skid control ECU connector.
Turn the engine switch on (IG).

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

Standard voltage:

for RH

STANDARD VOLTAGE

Tester Connection	Switch Condition	Specified Condition
t1-2 (FR+) - Body ground	Engine switch on (IG)	7.5 to 14 V

for LH

STANDARD VOLTAGE

Tester Connection	Switch Condition	Specified Condition
m1-2 (FL+) - Body ground	Engine switch on (IG)	7.5 to 14 V

NG : REPLACE SKID CONTROL ECU (See REMOVAL )

Fig 4: Inspecting Skid Control ECU (Sensor Input)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to next step

RECONFIRM DTC

Turn the engine switch off.
Reconnect the front speed sensor connector.
Clear the DTCs (See DTC CHECK/CLEAR ).
Start the engine.
Drive the vehicle at the speed of 32 km/h (20 mph) or more for at least 60 seconds.

Check if the same DTC is recorded (See DTC CHECK/CLEAR ).

Result

RESULT REFERENCE

Result	Proceed to
DTCs (C0200/31 and/or 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 : CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (See DIAGNOSIS SYSTEM )

A : Go to next step

REPLACE FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR
1. Turn the engine switch off.
2. Replace the front speed sensor (See REMOVAL ).
3. Replace the front axle hub sub-assembly (front speed sensor rotor) (See REMOVAL ).
  HINT:
  
  The front speed sensor rotor is incorporated into the front axle hub sub-assembly.
  
  If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly with front speed sensor.
  
  NOTE: Check the speed sensor signal after replacement (See TEST MODE PROCEDURE ).

RECONFIRM DTC

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

Check if the same DTC is recorded (See DTC CHECK/CLEAR ).

Result

RESULT REFERENCE

Result	Proceed to
DTCs (C0200/31 and/or 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 )

CHECK FRONT SPEED SENSOR INSTALLATION
1. Turn the engine switch off.
2. Check the speed sensor installation.
  OK:
  
  There is no clearance between the sensor and the front steering knuckle.
  
  The installation nut is tightened properly.
  
  Torque:
  
  8.5 N*m (87 kgf*cm, 75 in.*lbf)
  
  NOTE: Check the speed sensor signal after the installation (See TEST MODE PROCEDURE ).
NG : INSTALL FRONT SPEED SENSOR CORRECTLY (See INSTALLATION )

Fig 5: Checking Front Speed Sensor Installation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to next step
CHECK FRONT SPEED SENSOR TIP
1. Remove the front speed sensor (See REMOVAL ).
2. Check the speed sensor tip.
  OK:
  
  No scratches, oil, or foreign matter on the sensor tip.
  
  NOTE: Check the speed sensor signal after cleaning or replacement (See TEST MODE PROCEDURE ).
NG : CLEAN OR REPLACE FRONT SPEED SENSOR

OK : Go to next step

CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)

Install the front speed sensor.
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the skid control sensor wire.

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

Standard resistance:

for RH

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
t1 ("A"-2) - t1 ("B"-1)	Always	Below 1 Ω
t1 ("A"-2) - t1 ("B"-2)	Always	10 kΩ or higher
t1 ("A"-2) - Body ground	Always	10 kΩ or higher
t1 ("A"-1) - t1 ("B"-2)	Always	Below 1 Ω
t1 ("A"-1) - t1 ("B"-1)	Always	10 kΩ or higher
t1 ("A"-1) - Body ground	Always	10 kΩ or higher

for LH

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
m1 ("A"-2) - m1 ("B"-1)	Always	Below 1 Ω
m1 ("A"-2) - m1 ("B"-2)	Always	10 kΩ or higher
m1 ("A"-2) - Body ground	Always	10 kΩ or higher
m1 ("A"-1) - m1 ("B"-2)	Always	Below 1 Ω
m1 ("A"-1) - m1 ("B"-1)	Always	10 kΩ or higher
m1 ("A"-1) - Body ground	Always	10 kΩ or higher

Fig 6: Checking Harness And Connector (Skid Control Sensor Wire)

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

NG : REPLACE SKID CONTROL SENSOR WIRE

OK : Go to next step

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

Reconnect the skid control sensor wire.
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the skid control ECU connector and the front speed sensor connector.

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

Standard resistance:

for RH

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
A58-8 (FR+) - t1-2 (FR+)	Always	Below 1 Ω
A58-8 (FR+) - Body ground	Always	10 kΩ or higher
A58-7 (FR-) - t1-1 (FR-)	Always	Below 1 Ω
A58-7 (FR-) - Body ground	Always	10 kΩ or higher

for LH

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
A58-9 (FL+) - m1-2 (FL+)	Always	Below 1 Ω
A58-9 (FL+) - Body ground	Always	10 kΩ or higher
A58-10 (FL-) - m1-1 (FL-)	Always	Below 1 Ω
A58-10 (FL-) - Body ground	Always	10 kΩ or higher

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 7: Checking Harness And Connector (Skid Control ECU - Front Speed Sensor)

OK : Go to next step

INSPECT SKID CONTROL ECU (SENSOR INPUT)

Reconnect the skid control ECU connector.
Turn the engine switch on (IG).

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

Standard voltage:

for RH

STANDARD VOLTAGE

Tester Connection	Switch Condition	Specified Condition
t1-2 (FR+) - Body ground	Engine switch on (IG)	7.5 to 14 V

for LH

STANDARD VOLTAGE

Tester Connection	Switch Condition	Specified Condition
m1-2 (FL+) - Body ground	Engine switch on (IG)	7.5 to 14 V

NG : REPLACE SKID CONTROL ECU (See REMOVAL )

Fig 8: Inspecting Skid Control ECU (Sensor Input)

OK : Go to next step

RECONFIRM DTC

Turn the engine switch off.
Reconnect the front speed sensor connector.
Clear the DTCs (See DTC CHECK/CLEAR ).
Start the engine.
Drive the vehicle at the speed of 32 km/h (20 mph) or more for at least 60 seconds.

Check if the same DTC is recorded (See DTC CHECK/CLEAR ).

Result

RESULT REFERENCE

Result	Proceed to
DTCs (C0200/31 and/or 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 : CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (See DIAGNOSIS SYSTEM )

A : Go to next step

REPLACE FRONT SPEED SENSOR
1. Turn the engine switch off.
2. Replace the front speed sensor (See REMOVAL ).
  NOTE: Check the speed sensor signal after replacement (See TEST MODE PROCEDURE ).

RECONFIRM DTC

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

Check if the same DTC is recorded (See DTC CHECK/CLEAR ).

Result

RESULT REFERENCE

Result	Proceed to
DTCs (C0200/31 and/or 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 ROTOR
1. Turn the engine switch off.
2. Replace the front axle hub sub-assembly (front speed sensor rotor) (See REMOVAL ).
  HINT:
  
  The front speed sensor rotor is incorporated into the front axle hub sub-assembly.
  
  If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.
  
  NOTE: Check the speed sensor signal after replacement (See TEST MODE PROCEDURE ).

RECONFIRM DTC

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

Check if the same DTC is recorded (See DTC CHECK/CLEAR ).

Result

RESULT REFERENCE

Result	Proceed to
DTCs (C0200/31 and/or 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 )