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Home >> Toyota >> 2023 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Meter / Gauge System (Except HEV) - Diagnostic Codes (2 Of 2), Symptom Tests & Circuit Tests) >> METER / GAUGE SYSTEM (for Gasoline Model) >> Speed Signal Circuit [06/2018 - 01/2019] >> Procedure

Speed Signal Circuit [06/2018 - 01/2019]: Procedure

WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, 2020 Toyota Corolla, and 2019 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT COMBINATION METER ASSEMBLY (INPUT WAVEFORM) 
    GTY870211Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    *b Waveform
    1. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Tester connection I4-20 (SI) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Condition Engine switch on (IG), wheel being rotated

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

      Result

      Result  Proceed to
      The measured waveform is similar to that in the illustration A
      The measured waveform is not similar to that in the illustration
      (Stuck low)      		 B
      The measured waveform is not similar to that in the illustration
      (Stuck high)      		 C

    Result: 

    B 

    See step  6

    Result: 

    C 

    See step  9

    Result: 

    A 

    See step  2

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) 
    GTY984951Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    *b Waveform
    1. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Tester connection I4-36 (+S) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Condition Engine switch on (IG), wheel being rotated

      HINT: 

      • When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.
      • The waveform (B) changes depending on the connected ECUs.

      Result

      Result  Proceed to
      The measured waveform is similar to that in the illustration A
      The measured waveform is not similar to that in the illustration
      (Stuck low)      		 B
      The measured waveform is not similar to that in the illustration
      (Stuck high)      		 C

    Result: 

    B 

    See step  4

    Result: 

    C 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [06/2018 - 01/2019]

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY) 
    1. Disconnect the I4 combination meter assembly connector.
    2. Disconnect the A47 ECM connector.
    3. Disconnect the I68 stereo component amplifier assembly*1 connector.
    4. Disconnect the I55 radio and display receiver assembly connector.
    5. Disconnect the I69 navigation ECU*2 connector.
    6. Disconnect the C80 TCM*3 connector.
    7. Disconnect the I72 DCM (telematics transceiver)*4 connector.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A47-42 (SPD) - I4-36 (+S) Always Below 1 Ω
      I68-11 (SPD) - I4-36 (+S)*1 Always Below 1 Ω
      I55-27 (SPD) - I4-36 (+S) Always Below 1 Ω
      I69-9 (SPD) - I4-36 (+S)*2 Always Below 1 Ω
      C80-42 (SPD) - I4-36 (+S)*3 Always Below 1 Ω
      I72-10 (SPDP) - I4-36 (+S)*4 Always Below 1 Ω
      1. *1: for 8 Speakers
      2. *2: w/ Navigation System
      3. *3: for CVT
      4. *4: w/ Manual (SOS) Switch

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK THE VOLTAGE AT TERMINAL SPD OR SPDP OF EACH ECU 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. INSPECT EACH ECU (INTERNAL SHORT) 
    GTY985494Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    1. Disconnect one of the connectors below.
      NOTE:

      After disconnecting a connector, perform all steps with all other ECUs connected.

      Terminal No. (Symbol) ECU
      A47 ECM
      I68*1 Stereo component amplifier assembly
      I55 Radio and display receiver assembly
      I69*2 Navigation ECU
      C80*3 TCM
      I72*4 DCM (telematics transceiver
      1. *1: for 8 Speakers
      2. *2: w/ Navigation System
      3. *3: for CVT
      4. *4: w/ Manual (SOS) Switch
    2. Measure the voltage according to the value(s) in the table below.
      NOTE:

      Make sure to perform this inspection with the wheels stopped.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I4-36 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V
    3. Repeat steps (a) and (b) for each connected ECU.

      HINT: 

      If the voltage changed to the specified voltage after disconnecting a connector, an internal short in the disconnected ECU is suspected.

      Result

      Result  Proceed to
      After performing the inspection procedure for all connectors, the voltage did not change to the specified voltage A
      When disconnecting the connector of the ECM, the voltage changed to the specified voltage B
      When disconnecting the connector of the stereo component amplifier assembly, the voltage changed to the specified voltage
      (except 6 Speakers)      		 C
      When disconnecting the connector of the radio and display receiver assembly, the voltage changed to the specified voltage D
      When disconnecting the connector of the navigation ECU, the voltage changed to the specified voltage
      (w/ Navigation System)      		 E
      When disconnecting the connector of the TCM, the voltage changed to the specified voltage
      (for CVT)      		 F
      When disconnecting the connector of the DCM (telematics transceiver, the voltage changed to the specified voltage
      (w/ Manual (SOS) Switch)      		 G

    Result: 

    B 

    REPLACE ECM 

    Refer to REMOVAL [06/2018 - 01/2019]

    Result: 

    C 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [06/2018 - 01/2019]

    Result: 

    D 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

    Refer to REMOVAL [06/2018 - 01/2019]

    Result: 

    E 

    REPLACE NAVIGATION ECU 

    Refer to REMOVAL [06/2018 - 03/2019]

    Result: 

    F 

    REPLACE TCM 

    Refer to REMOVAL [06/2018 - 01/2019]

    Result: 

    G 

    REPLACE DCM (TELEMATICS TRANSCEIVER) 

    Refer to REMOVAL [06/2018 - 01/2019]

    Result: 

    A 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A47 ECM connector.
    2. Disconnect the I68 stereo component amplifier assembly*1 connector.
    3. Disconnect the I55 radio and display receiver assembly connector.
    4. Disconnect the I69 navigation ECU*2 connector.
    5. Disconnect the C80 TCM*3 connector.
    6. Disconnect the I72 DCM (telematics transceiver)*4 connector.
    7. Disconnect the I4 combination meter assembly connector.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A47-42 (SPD), I68-11 (SPD)*1, I55-27 (SPD), I69-9 (SPD)*2, C80-42 (SPD)*3 or I72-10 (SPDP)*4 - I4-36 (+S) Always Below 1 Ω
      A47-42 (SPD), I68-11 (SPD)*1, I55-27 (SPD), I69-9 (SPD)*2, C80-42 (SPD)*3, I72-10 (SPDP)*4 or I4-36 (+S) - Body ground Always 10 kΩ or higher
      1. *1: for 8 Speakers
      2. *2: w/ Navigation System
      3. *3: for CVT
      4. *4: w/ Manual (SOS) Switch

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [06/2018 - 01/2019]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK FOR DTC (SMART KEY SYSTEM (FOR START FUNCTION)) 
    1. Check for smart key system (for start function) DTCs are output.

      Body Electrical > Power Source Control > Trouble Codes 

      Result

      Result Proceed to
      DTC B2282 is not output A
      DTC B2282 is output B

    Result: 

    B 

    GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [06/2018 - 01/2019]

    Result: 

    A 

    See step  7

  7. INSPECT COMBINATION METER ASSEMBLY 

    HINT: 

    This procedure is performed to check the diode inside the combination meter assembly.

    1. Remove the combination meter assembly.

      Refer to REMOVAL [06/2018 - 01/2019]

    2. Measure the internal resistance of the combination meter assembly.

      Standard Resistance

      Tester Connection Tester Connection Condition Measured Value
      I4-38 (IG+) - I4-20 (SI)
      • Positive (+) tester probe → I4-38 (IG+)
      • Negative (-) tester probe → I4-20 (SI)
      		 Always A
      I4-38 (IG+) - I4-20 (SI)
      • Positive (+) tester probe → I4-20 (SI)
      • Negative (-) tester probe → I4-38 (IG+)
      		 Always B

      OK

      There is a large difference between the measured value (A) and the measured value (B).

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [06/2018 - 01/2019]

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the I1 certification ECU (smart key ECU assembly) connector.
    2. Disconnect the I4 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I1-21 (SPDO) or I4-20 (SI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK FOR DTC (SMART KEY SYSTEM (FOR START FUNCTION)) 
    1. Check for smart key system (for start function) DTCs are output.

      Body Electrical > Power Source Control > Trouble Codes 

      Result

      Result Proceed to
      DTC B2282 is not output A
      DTC B2282 is output B

    Result: 

    B 

    GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [06/2018 - 01/2019]

    Result: 

    A 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the I1 certification ECU (smart key ECU assembly) connector.
    2. Disconnect the I4 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I1-21 (SPDO) - I4-20 (SI) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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