Speedometer Malfunction

METER: METER / GAUGE SYSTEM: Speedometer Malfunction

Speedometer Malfunction

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT COMBINATION METER ASSEMBLY
(a) Check the input signal waveform.





(1) Remove the combination meter assembly.
(2) Connect the oscilloscope to terminal C11-15 and body ground.
(3) Start the engine.





(4) Check the signal waveform according to the condition(s) in the table below.





HINT: As vehicle speed increases, the cycle of the signal waveform narrows.

NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER - SKID CONTROL ECU)
OK -- REPLACE COMBINATION METER ASSEMBLY
2. CHECK HARNESS AND CONNECTOR (COMBINATION METER - SKID CONTROL ECU)





(a) Disconnect the S37 and C11 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SKID CONTROL ECU ASSEMBLY