METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

In this circuit, the meter CPU receives engine speed signals from the ECM using the CAN communication system. The meter CPU displays the engine speed, which is calculated based on the data received from the ECM.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if a CAN communication DTC is output.

      
      

      1. for LHD Click here.

      2. for RHD Click here.

         Result

         Result	Proceed to
         CAN communication DTC is not output	A
         CAN communication DTC is output (for LHD)	B
         CAN communication DTC is output (for RHD)	C

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   C

   GO TO CAN COMMUNICATION SYSTEM Click here

   A

2. PERFORM ACTIVE TEST USING GTS (TACHOMETER OPERATION)

   
   

   1. Use the Active Test to check the operation of the tachometer Click here.

      Combination Meter

      Tester Display	Test Part	Control Range	Diagnostic Note
      Tacho Meter Operation	Tachometer	OFF, 0, 1000, 2000, 3000, 4000, 5000, 6000 or 7000 (rpm)	-

      OK
      Tachometer indication is normal.

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

3. READ VALUE USING GTS (ENGINE RPM)

   
   

   1. Use the Data List to check the engine speed Click here.

      Combination Meter

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Engine Rpm	Engine speed / Min.: 0 rpm, Max.: 12750 rpm	Actual engine speed	-

      OK
      Engine speed displayed on the GTS is almost the same as the tachometer indication.

   2. Record the engine speed displayed on the GTS.

      Tech Tips

      Check the engine speed when the engine is fully warmed up and the air conditioning and all electrical accessories are off.

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

4. READ VALUE USING GTS (ENGINE SPEED)

   
   

   1. Use the Data List to check the engine speed Click here.

      Engine and ECT

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Engine Speed	Engine speed / Min.: 0 rpm, Max.: 16383 rpm	600 to 700 rpm: When idling	-

      OK
      Engine speed displayed on the GTS is almost the same as the previously recorded value displayed on the GTS (Body Electrical / Combination Meter / Data List / Engine Rpm).

   
   

   NG

   GO TO SFI SYSTEM Click here

   OK

5. CHECK COMBINATION METER ASSEMBLY

   
   

   1. Replace the combination meter assembly with a new or normally functioning one Click here.

   2. Check the tachometer operation.

      OK
      The operation of the tachometer returns to normal.

   
   

   NG

   REPLACE ECM Click here

   OK

   END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)