Meter / Gauge System Tachometer Malfunction

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK COMBINATION METER ASSEMBLY

CHECK WIRE HARNESS (METER - ECM)

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Disconnect the C10 meter connector.
   

2. Using an oscilloscope, check the signal waveform of the meter.
   

   Tester Connection	Tool Setting	Vehicle Condition
   C10-7 - Body ground	5 V/DIV., 10 msec./DIV.	Engine idling

   OK:

   Refer to the illustration.
   

   HINT:

   As the engine speed increases, the wavelength shortens.

1. Disconnect the C10 meter connector.
   

2. Disconnect the E13*1 or E4*2 ECM connector.
   

   HINT:

   *1: 1GR-FE

   *2: 1KD-FTV

3. Measure the resistance of the wire harness side connectors.
   

   Standard resistance:

   1GR-FE

   Tester Connection	Specified Condition
   C10-7 - E13-1 (TACH)	Below 1 Ω

   1KD-FTV:

   Tester Connection	Specified Condition
   C10-7 - E4-4 (TACH)	Below 1 Ω