Inspection Procedure

PERFORM ACTIVE TEST BY HAND-HELD TESTER

Operate the hand-held tester according to the steps on the display and select the "ACTIVE TEST".

METER:

SPEED METER ACTIVE TEST REFERENCE

Item	Test Details	Diagnostic Note
SPEED METER	0 / 40(24) / 80(48) / 120(72) / 1 60(96) / 180(108) / 200(120) km/h(mph)	-

OK:

Needle indication is normal.

NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL )

OK: GO TO NEXT STEP

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

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

METER:

SPEED METER DATA LIST REFERENCE

Item	Measurement Item/ Range (Display)	Normal Condition	Diagnostic Note
SPEED METER	Vehicle speed / Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)	Almost same as actual vehicle speed (When driving)	-

OK:

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

NG: Go to step 3

OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL )

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

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

ABS:

ABS DATA LIST REFERENCE

Item	Measurement Item/ Range (Display)	Normal Condition	Diagnostic Note
(FR/FL/RR/RL) SPD	Vehicle speed / Min.: 0 km/h (0 mph), Max.: 326 km/h (202 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 )

OK: GO TO NEXT STEP

INSPECT COMBINATION METER ASSY

INSPECTION USING OSCILLOSCOPE

Check the input signal waveform.
Remove the combination meter assy.
Connect the oscilloscope to the terminals C12-18 and body ground.
Start the engine.

Fig 1: Identifying Terminals C12-18
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check the signal waveform according to the condition (s) in the table below.

Fig 2: Identifying Signal Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SIGNAL WAVEFORM CONDITIONS

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 vehicle speed increases, the cycle of the signal waveform narrows.

NG: Go to step 5

OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL )

CHECK HARNESS AND CONNECTOR (ABS & TRACTION ACTUATOR ASSY (VSC) -COMBINATION METER ASSY) (SEE HOW TO PROCEED WITH TROUBLESHOOTING )

Disconnect the C12 and S42 connectors.
Measure the resistance according to the value (s) in the table below.

Standard

C12 AND S42 CONNECTORS RESISTANCE SPECIFICATIONS

Tester Connection	Condition	Specified Condition
C12-18 - S42-12	Always	Below 1 Ω
C12-18 - Body ground	Always	10 kΩ or higher

Fig 3: Identifying C12 And S42 Connectors

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: GO TO NEXT STEP

INSPECT ABS & TRACTION ACTUATOR ASSY (VSC)

Disconnect the S42 connector.
Measure the voltage according to the value (s) in the table below.

Standard

S42 connector VOLTAGE SPECIFICATIONS

Tester Connection	Condition	Specified Condition
S42-12 - Body ground	Ignition switch ON	10 to 14 V

NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL )

Fig 4: Identifying S42 Connector Terminals

OK: GO TO BRAKE CONTROL SYSTEM (SEE HOW TO PROCEED WITH TROUBLESHOOTING )