METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

In this circuit, the combination meter assembly receives engine speed signals from the ECM via the CAN communication system. The combination meter assembly displays the engine speed calculated based on the data received from the ECM.

WIRING DIAGRAM

*1	Combination Meter Assembly
*2	CAN Communication Line

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if CAN communication DTCs are output.

      for LHD: Click here

      for RHD: Click here

      Result
      Result Proceed to CAN communication DTCs are not output. A CAN communication DTCs are output.(for LHD) B CAN communication DTCs are 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. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

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

   5. Check the operation by referring to the table below.

      
      Body Electrical > Combination Meter > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      TachoMeter Operation	Tachometer	OFF, 0, 1000, 2000, 3000, 4000, 5000, 6000, 7000	-

      
      Body Electrical > Combination Meter > Active Test

      Tester Display
      TachoMeter Operation

      OK
      Tachometer indication is normal.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

3. READ VALUE USING GTS (ENGINE RPM)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

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

   5. Check the values by referring to the table below.

      
      Body Electrical > Combination Meter > Data List

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

      
      Body Electrical > Combination Meter > Data List

      Tester Display
      Engine Rpm

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

      Tech Tips

      
      

      • When the Data List values and tachometer values match, a signal output error of the ECM or an internal malfunction of the combination meter assembly is suspected.

      • When the Data List values and tachometer values do not match, an internal malfunction of the combination meter assembly is suspected.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

4. CHECK FOR DTC

   
   

   1. Check if SFI system DTCs are output.

      for 2GR-FE: Click here

      for 2AR-FE: Click here

      
      Powertrain > Engine > Trouble Codes

      Result
      Result Proceed to SFI system DTCs are not output. A SFI system DTCs are output. (for 2GR-FE) B SFI system DTCs are output. (for 2AR-FE) C

   
   

   B

   GO TO SFI SYSTEM Click here

   C

   GO TO SFI SYSTEM Click here

   A

5. READ VALUE USING GTS (ENGINE SPEED, ENGINE RPM)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

   4. Enter the following menus:

      
      

      1. for Engine: Powertrain / Engine / Data List.

      2. for Combination Meter: Body Electrical / Combination Meter / Data List.

   5. Check the values by referring to the table below.

      
      

      1. Engine

         
         Powertrain > Engine > Data List

         Tester Display	Measurement Item	Range	Normal Condition	Reference Value	Diagnostic Note
         Engine Speed	Engine speed	Min.: 0 rpm, Max.: 16383 rpm	for 2AR-FE: 700 to 800 rpm: Idling with warm engine, shift lever in N, A/C off for 2GR-FE: 600 to 700 rpm: Idling with warm engine (A/C off, shift lever in N)	for 2AR-FE: Idling (engine warmed up and A/C off): 750 rpm for 2GR-FE: Idling (engine warmed up and A/C off): 667 rpm	When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed.

         
         Powertrain > Engine > Data List

         Tester Display
         Engine Speed

      2. Combination Meter

         
         Body Electrical > Combination Meter > Data List

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

         
         Body Electrical > Combination Meter > Data List

         Tester Display
         Engine Rpm

      Result
      Result Proceed to The data list values of the ECUs do not match. A The data list values of the ECUs match. (for 2GR-FE) B The data list values of the ECUs match. (for 2AR-FE) C

      Tech Tips

      
      

      • When the Data List values of the ECUs match, an internal malfunction of the ECM is suspected.

      • When the Data List values of the ECUs do not match, a signal output error of the ECM or an internal malfunction of the combination meter assembly is suspected.

   
   

   B

   REPLACE ECM Click here

   C

   REPLACE ECM Click here

   A

6. REPLACE COMBINATION METER ASSEMBLY

   
   

   1. Replace the combination meter assembly with a new or known good one.

      Click here

      OK
      The operation of the tachometer returns to normal.

      Result
      Result Proceed to OK A NG (for 2GR-FE) B NG (for 2AR-FE) C

   
   

   A

   END

   B

   REPLACE ECM Click here

   C

   REPLACE ECM Click here