METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

The No. 1 meter ECU receives engine revolution signals from the hybrid vehicle control ECU via the CAN line. The No. 1 meter ECU displays engine revolution data that is calculated based on the data received from the hybrid vehicle control ECU.

WIRING DIAGRAM

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check for DTC (See page [for LHD], Click here [for RHD]).

      Result

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

   
   

   B

   Go to CAN COMMUNICATION SYSTEM Click here

   C

   Go to CAN COMMUNICATION SYSTEM Click here

   A

2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (TACHOMETER OPERATION)

   
   

   1. Operate the intelligent tester according to the display and select "Active Test".

      Combination Meter

      Tester Display	Test Part	Control Range
      Tachometer operation	Tachometer	0, 1000, 2000, 3000, 4000, 5000, 6000 or 7000

      OK
      Needle indication is normal.

   
   

   NG

   REPLACE NO. 1 METER ECU Click here

   OK

3. READ VALUE USING INTELLIGENT TESTER (ENGINE RPM)

   
   

   1. Operate the intelligent tester according to the display and select "Data List".

      Combination Meter

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Engine Rpm	Engine speed / Min.: 0, Max.: 12750	Idling: 700 to 800 rpm	Unit: rpm

      OK
      Engine speed displayed on tester is almost the same as actual engine speed.

   
   

   OK

   REPLACE NO. 1 METER ECU Click here

   NG

4. READ VALUE USING INTELLIGENT TESTER (ENGINE REVOLUTION)

   
   

   1. Operate the intelligent tester according to the display and select "Data List".

      Hybrid Control

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Engine Revolution	Engine speed / Min.: 0, Max.: 16383.75	Idling: 700 to 800 rpm	Unit: rpm

      OK
      Engine speed displayed on the tester is almost the same as the actual engine speed.

   
   

   NG

   Go to HYBRID CONTROL SYSTEM Click here

   OK

5. REPLACE NO. 1 METER ECU

   
   

   1. Temporarily replace the No. 1 meter ECU with a new one Click here.

   
   

   NEXT

6. CHECK COMBINATION METER ASSEMBLY (TACHOMETER)

   
   

   1. Check the operation of the tachometer returns to normal Click here.

      OK
      Operation of tachometer returns to normal.

   
   

   OK

   END (NO. 1 METER ECU IS DEFECTIVE)

   NG

   REPLACE HYBRID VEHICLE CONTROL ECU Click here