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Home >> Lexus >> 2024 >> TX 350 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes & Symptom Tests (1 Of 2) >> Meter / Gauge System >> Tachometer Malfunction [09/2023 - 12/2023] >> Procedure

Tachometer Malfunction [09/2023 - 12/2023]: Procedure

  1. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      except Gasoline Model A
      for Gasoline Model B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if CAN communication DTCs are output.

      Refer to DIAGNOSIS SYSTEM [09/2023 - ]

      Result

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

    Result: 

    B 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

    Result: 

    A 

    See step  3

  3. CHECK FOR DTC (HYBRID CONTROL SYSTEM) 
    1. Check if hybrid control system DTCs are output.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

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

    Result: 

    B 

    GO TO HYBRID CONTROL SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ] 

    Result: 

    A 

    See step  4

  4. READ VALUE USING GTS 
    1. Read the Data List according to the display on the GTS.

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Engine RPM Engine speed input Min.: 0 rpm, Max.: 12701 rpm or Unset Almost the same as actual tachometer The value displayed on the tachometer may deviate.*
      1. *: For the tolerance of tachometer, refer to Operation Check.

        Refer to OPERATION CHECK [09/2023 - ]

      Body Electrical > Combination Meter > Data List 

      Tester Display
      Engine RPM

      Result

      Result Proceed to
      The value displayed in the Data List and on the tachometer approximately match A
      The value displayed in the Data List and on the tachometer do not match B

    Result: 

    A 

    GO TO HYBRID CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

  5. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if CAN communication DTCs are output.

      Refer to DIAGNOSIS SYSTEM [09/2023 - ]

      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 [09/2023 - ] 

    Result: 

    A 

    See step  6

  6. CHECK FOR DTC (SFI SYSTEM) 
    1. Check if SFI system DTCs are output.

      Powertrain > Engine > Trouble Codes 

      Result

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

    Result: 

    B 

    GO TO SFI SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ] 

    Result: 

    A 

    See step  7

  7. READ VALUE USING GTS 
    1. Read the Data List according to the display on the GTS.

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Engine RPM Engine speed input Min.: 0 rpm, Max.: 12701 rpm or Unset Almost the same as actual tachometer The value displayed on the tachometer may deviate.*
      1. *: For the tolerance of tachometer, refer to Operation Check.

        Refer to OPERATION CHECK [09/2023 - ]

      Body Electrical > Combination Meter > Data List 

      Tester Display
      Engine RPM

      Result

      Result Proceed to
      The value displayed in the Data List and on the tachometer approximately match A
      The value displayed in the Data List and on the tachometer do not match B

    Result: 

    A 

    GO TO SFI SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2023 - ]