METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

In this circuit, the combination meter assembly receives engine speed signals from the hybrid vehicle control ECU assembly using the CAN communication system. The combination meter assembly displays the engine speed calculated based on the data received from the hybrid vehicle control ECU assembly.

PROCEDURE

1. Click here

   CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if CAN communication DTCs are output (See page w/ Central Gateway ECU,Click herew/o Central Gateway ECU).

      Result
      Result Proceed to CAN communication DTCs are not output. A CAN communication DTCs are output (w/ Central Gateway ECU). B CAN communication DTCs are output (w/o Central Gateway ECU). C

   
   
   • AClick here
   • B

     GO TO CAN COMMUNICATION SYSTEM (Click here)

   • C

     GO TO CAN COMMUNICATION SYSTEM (Click here)

2. Click here

   PERFORM ACTIVE TEST USING GTS (TACHO METER OPERATION)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

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

   5. Perform the Active Test according to the display on the GTS.

      Table 2. Combination Meter

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

      OK
      Tachometer indication is normal.

   
   
   • OKClick here
   • NG

     REPLACE COMBINATION METER ASSEMBLY (Click here)

3. Click here

   READ VALUE USING GTS (ENGINE RPM)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

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

   5. Read the Data List according to the display on the GTS.

      Table 3. Combination Meter

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Engine Rpm	Engine speed/Min.: 0 rpm, Max.: 12750 rpm	Approximately 900 rpm: Idling	-

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

      Tip:
      

      • When the Data List values and tachometer values match, a signal output error of the hybrid vehicle control ECU assembly 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.

   
   
   • OKClick here
   • NG

     REPLACE COMBINATION METER ASSEMBLY (Click here)

4. Click here

   CHECK HYBRID CONTROL SYSTEM

   
   

   1. Check if hybrid control system DTCs are output (Click here).

      Result
      Result Proceed to DTCs are not output. A DTCs are output. B

   
   
   • AClick here
   • B

     GO TO HYBRID CONTROL SYSTEM (Click here)

5. Click here

   READ VALUE USING GTS (ENGINE REVOLUTION, ENGINE RPM)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

   4. Enter the following menus:

      
      

      1. for Hybrid Control: Powertrain / Hybrid Control / Data List.

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

   5. Read the Data List according to the display on the GTS.

      Table 4. Hybrid Control

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Engine Revolution	Engine speed/ Min.: 0 rpm, Max.: 16383 rpm	While idling after the engine is warmed up and in inspection mode: Approximately 900 rpm While driving at a constant speed: No significant fluctuation	-

      Table 5. Combination Meter

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Engine Rpm	Engine speed/Min.: 0 rpm, Max.: 12750 rpm	Almost the same as actual engine speed	-

      Result
      Result Proceed to The data list values of the ECUs do not match. A The data list values of the ECUs match. B

      Tip:
      

      • When the Data List values of the ECUs match, an internal malfunction of the hybrid vehicle control ECU assembly is suspected.

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

   
   
   • AClick here
   • B

     REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY (Click here)

6. Click here

   REPLACE COMBINATION METER ASSEMBLY

   
   

   1. Replace the combination meter assembly with a new one (Click here).

      OK
      The operation of the tachometer returns to normal.

   
   
   • OK

     END

   • NG

     REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY (Click here)