Inspection Procedure

READ VALUE OF HAND-HELD TESTER (VEHICLE SPEED SIGNAL)

Operate the hand-held tester according to the steps on the display and select "DATA LIST".

ABS:

DATA LIST SPECIFICATION TABLE - ABS

Item	Measurement Item/ Range (Display)	Normal Condition	Diagnostic Note
(FR/FL/RR/RL) Wheel Speed	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)	Almost same as actual speed (When driving)	-

OK: Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.

NG: GO TO BRAKE CONTROL SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING (w/ VSC), HOW TO PROCEED WITH TROUBLESHOOTING (w/ ABS (TMMK MADE), HOW TO PROCEED WITH TROUBLESHOOTING (w/ ABS (TMC MADE))

OK: Go to Next Step

INSPECT COMBINATION METER ASSY

INSPECTION USING OSCILLOSCOPE

Remove the combination meter assy with the connectors still connected.
Connect the oscilloscope to terminal C7-35 and body ground.
Start the engine.
Check the signal wave form according to the condition(s) in the table below.

Fig 1: Identifying Combination Meter Assy Terminal C7-35

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

COMBINATION METER ASSY - REFERENCE TABLE

Item	Condition
Tool setting	5 V/DIV, 20 ms/DIV
Vehicle condition	Driving at approx. 20 km/h (12 mph)

OK:

As shown in the illustration

HINT:

As the vehicle speed increases, the cycle of the signal wave form narrows.

Fig 2: Identifying Signal Wave Graph

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Result:

COMBINATION METER ASSY - RESULT TABLE

OK	A
NG (w/ VSC)	B
NG (w/ ABS only)	C

B: Go to step 3

C: Go to step 5

A: REPLACE COMBINATION METER ASSY (SEE OVERHAUL )

CHECK HARNESS OR CONNECTOR (BETWEEN ABS & TRACTION ACTUATOR ASSY (VSC) AND COMBINATION METER ASSY)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step
INSPECT ABS & TRACTION ACTUATOR ASSY (VSC)
1. Shift the shift lever to neutral.
2. Jack up either of the front wheels.
3. Turn the ignition switch to ON.
4. Measure the voltage between terminal S1-12 of the VSC & traction actuator assy and body ground when the front wheel is turned slowly.
  
  Fig 3: Identifying VSC & Traction Actuator Assy Terminal S1-12
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  
  OK:
  
  Voltage is generated intermittently.
Fig 4: Identifying Voltage Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE ABS & TRACTION ACTUATOR ASSY (VSC) (See HOW TO PROCEED WITH TROUBLESHOOTING )

OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL )
CHECK HARNESS OR CONNECTOR (BETWEEN BRAKE ACTUATOR ASSY (ABS) AND COMBINATION METER ASSY)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step
INSPECT BRAKE ACTUATOR ASSY (ABS)
1. Shift the shift lever to neutral.
2. Jack up either of the front wheels.
3. Turn the ignition switch to ON.
4. TMMK Made:
  Measure voltage between terminal S1-23 of the brake actuator assy (ABS) and body ground with the front wheel turned slowly.
  
  Fig 5: Identifying Brake Actuator Assy (TMMK Made) Terminal S1-23
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5. TMC Made:
  Measure the voltage between terminal S1-26 of the brake actuator assy (ABS) and body ground with the front wheel is turned slowly.
  
  Fig 6: Identifying Brake Actuator Assy (TMC Made) Terminal S1-26
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  
  OK:
  
  Voltage is generated intermittently.
Fig 7: Identifying Voltage Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE BRAKE ACTUATOR ASSY (ABS) (See HOW TO PROCEED WITH TROUBLESHOOTING (w/ ABS (TMMK MADE), HOW TO PROCEED WITH TROUBLESHOOTING (w/ ABS (TMC MADE))

OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL )