Tachometer Malfunction

METER: METER / GAUGE SYSTEM: Tachometer Malfunction

Tachometer Malfunction

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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






OK:
Engine speed display on the tester is almost the same as the actual engine speed.
NG -- GO TO ENGINE 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.
NG -- CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - ECM)
OK -- REPLACE COMBINATION METER ASSEMBLY
3. CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - ECM)





(a) Disconnect the C6 meter connector.
(b) Disconnect the E5 ECM connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE ECM