Tachometer Malfunction [09/2014 - ]: Procedure

1. Check if CAN communication DTCs are output.

   Refer to DIAGNOSIS SYSTEM [09/2014 - 08/2016] , or refer to DIAGNOSIS SYSTEM [08/2016 - 11/2017] , or refer to DIAGNOSIS SYSTEM [11/2017 - 03/2019] , or refer to DIAGNOSIS SYSTEM [03/2019 - 09/2020] , or refer to DIAGNOSIS SYSTEM [09/2020 - 01/2023] , or refer to DIAGNOSIS SYSTEM [01/2023 - 10/2023] , or refer to DIAGNOSIS SYSTEM [10/2023 - ]

   Result

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

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 03/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2019 - 01/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [01/2023 - ] 

Result: 

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Combination Meter / Data List.
5. Read the Data List according to the display on the Techstream.

   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	Almost the same as actual tachometer	-

   Body Electrical > Combination Meter > Data List 

   Tester Display
   Engine Rpm

   OK

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

   HINT: 

   • When the Data List values and tachometer values match, a signal output malfunction 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

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  3

1. Check if SFI system DTCs are output.

   Refer to DTC CHECK / CLEAR [09/2014 - ]

   Powertrain > Engine > Trouble Codes 

   Result

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

Result: 

B 

GO TO SFI SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - ] 

Result: 

A 

See step  4

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus:
   1. for Engine: Powertrain / Engine / Data List.
   2. for Combination Meter: Body Electrical / Combination Meter / Data List.
5. Read the Data List according to the display on the Techstream.
   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	700 to 800 rpm: Idling with warm engine	Idling (engine warmed up and A/C off): 763 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	Almost the same as actual tachometer	-

      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.	B

   HINT: 

   • 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 malfunction of the ECM or an internal malfunction of the combination meter assembly is suspected.

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [09/2014 - ] 

Result: 

A 

See step  5

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

   Refer to REMOVAL [09/2014 - ]

   OK

   The operation of the tachometer returns to normal.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

REPLACE ECM. Refer to  REMOVAL [09/2014 - ]