Speedometer Malfunction

METER: METER / GAUGE SYSTEM: Speedometer Malfunction

Speedometer Malfunction

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (FR/FL/RR/RL WHEEL SPEED)
(a) Check the Data List for proper functioning of the vehicle speed signal.
ABS/VSC/TRAC:






OK:
Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.
NG -- GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM
OK -- Continue to next step.

2. CHECK COMBINATION METER ASSEMBLY




(a) Using an oscilloscope, check the signal waveform of the meter.






OK:
Refer to the illumination.
HINT: As the vehicle speed increases, the wavelength shortens.

OK -- REPLACE COMBINATION METER
NG -- Continue to next step.

3. CHECK WIRE HARNESS (ECU - METER)




(a) Disconnect the S8 ECU connector.
(b) Disconnect the C10 meter connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM