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 calculated based on the data received from the ECM.

WIRING DIAGRAM

*1	CAN Communication Line
*2	Combination Meter Assembly

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if a CAN communication system DTC is output.

      
      

      • w/o Toyota Safety Sense Click here

      • w/ Toyota Safety Sense Click here

      Result

      Result	Proceed to
      CAN communication DTC is not output	A
      DTC is output (w/o Toyota Safety Sense)	B
      DTC is output (w/ Toyota Safety Sense)	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. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body / Combination Meter / Active Test.

   5. According to the display on the GTS, perform the Active Test.

      Combination Meter

      Tester Display	Test Part	Control Range	Diagnostic Note
      TachoMeter Operation	Tachometer	0/1000/2000/3000/4000/5000/6000/7000 rpm	Perform the test with the vehicle stopped and the engine idling.

      OK
      Tachometer indication is normal.

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

3. READ VALUE USING GTS (ENGINE RPM)

   
   

   1. Connect the GTS to the DLC3.

   2. Start the engine.

   3. Turn the GTS on.

   4. Enter the following menus: Body / Combination Meter / Data List.

   5. According to the display on the GTS, read the Data List.

      Combination Meter

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Engine Rpm	Engine speed/ Min.: 0 Max.: 12750	Approximately same as actual engine speed (when engine is running)	Unit: rpm

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

      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. CHECK ENGINE CONTROL SYSTEM

   
   

   1. Check if an engine control DTC is output.

      
      

      • for 2NR-FKE Click here

      • for 1KR-FE Click here

      • for 1ND-TV with DPF Click here

      • for 1ND-TV without DPF Click here

      Result

      Result	Proceed to
      Engine control DTC is not output	A
      Engine control DTC is output (for 2NR-FKE)	B
      Engine control DTC is output (for 1KR-FE)	C
      Engine control DTC is output (for 1ND-TV with DPF)	D
      Engine control DTC is output (for 1ND-TV without DPF)	E

   
   

   A

   REPLACE COMBINATION METER ASSEMBLY Click here

   B

   GO TO SFI SYSTEM Click here

   C

   GO TO SFI SYSTEM Click here

   D

   GO TO ECD SYSTEM Click here

   E

   GO TO ECD SYSTEM Click here