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, E9*2, E4*3 or E22*4 ECM connector.
   

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

   Standard resistance:

   for 1GR-FE

   Tester Connection	Specified Condition
   C10-7 - E13-1 (TACH)	Below 1 Ω
   C10-7 - Body ground	10 kΩ or higher

   for 2TR-FE:

   Tester Connection	Specified Condition
   C10-7 - E9-1 (TACH)	Below 1 Ω
   C10-7 - Body ground	10 kΩ or higher

   for 1KD-FTV:

   Tester Connection	Specified Condition
   C10-7 - E4-4 (TACH)	Below 1 Ω
   C10-7 - Body ground	10 kΩ or higher

   for 5L-E:

   Tester Connection	Specified Condition
   C10-7 - E22-7 (TACH)	Below 1 Ω
   C10-7 - Body ground	10 kΩ or higher

   Result

   Result	Proceed to
   OK (1GR-FE, 2TR-FE)	A
   OK (1KD-FTV, 5L-E)	B
   NG	C