Speedometer Malfunction

METER: METER / GAUGE SYSTEM: Speedometer Malfunction

Speedometer Malfunction

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF INTELLIGENT TESTER (VEHICLE SPEED SIGNAL)
(a) Operate the intelligent tester according to the step on the display and select "DATA LIST".
ABS / TRAC / VSC:

OK:
Vehicle speed display on the tester is almost the same as the actual vehicle speed.
NG -- GO TO BRAKE CONTROL SYSTEM
OK -- Continue to next step.
2. CHECK COMBINATION METER ASSEMBLY

(a) Disconnect the C6 meter connector.
(b) Using an oscilloscope, check the signal waveform of the meter.

OK:
As shown in the illustration.
HINT: As vehicle speed increases, the cycle of the signal waveform narrows.

NG -- CHECK WIRE HARNESS (COMBINATION METER - BRAKE ACTUATOR)
OK -- REPLACE COMBINATION METER ASSEMBLY
3. CHECK WIRE HARNESS (COMBINATION METER - BRAKE ACTUATOR)

(a) Disconnect the C6 meter connector.
(b) Disconnect the S1 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
4. INSPECT BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU WITH ACTUATOR)

(a) Disconnect the S1 ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:

NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY