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Home >> Toyota >> 2022 >> Corolla Cross L, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Symptom Tests (2 Of 2) & Circuit Tests >> Meter / Gauge System >> Speed Signal Circuit [11/2023 - ] >> Procedure

Speed Signal Circuit [11/2023 - ]: Procedure

  1. CHECK COMBINATION METER ASSEMBLY (INPUT WAVEFORM) 
    1. Connect the combination meter assembly connector.
    2. Check the signal waveform according to the condition(s) in the table below.
      GTY1113439Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Combination Meter Assembly)
      *b Waveform
      Item Condition
      Tester connection I4-25 (SI) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Condition Ignition switch ON, wheel being rotated

      OK

      The waveform is similar to that shown in the illustration.

      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  12

    Result: 

    A 

    See step  2

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) 
    1. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Tester connection I4-8 (+S) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Condition Ignition switch ON, wheel being rotated
      NOTE:

      Perform the inspection from the back of the connector with the connector connected.

      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.
      GTY1179207Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Combination Meter Assembly)
      *b Waveform

      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 [11/2023 - ]

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A199 ECM connector.*1
      1. *1: for Gasoline Model
    2. Disconnect the I55 radio and display receiver assembly connector.
    3. Disconnect the I234 stereo component amplifier assembly connector.*1
      1. *1: w/ Stereo Component Amplifier
    4. Disconnect the I4 combination meter assembly connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I55-8 (SPD) - I4-8 (+S) Always Below 1 Ω
      A199-93 (SPD) - I4-8 (+S)*1 Always Below 1 Ω
      I234-11 (SPD) - I4-8 (+S)*2 Always Below 1 Ω
      A199-93 (SPD)*1, I55-8 (SPD), I234-11 (SPD)*2 or I4-8 (+S) - Body ground Always 10 kΩ or higher
      1. *1: for Gasoline Model
      2. *2: w/ Stereo Component Amplifier

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK THE VOLTAGE AT TERMINAL SPD OF EACH ECU 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. INSPECT EACH ECU (INTERNAL SHORT) 
    1. Disconnect one of the connectors below.
      NOTE:

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

      Connector ECU
      I55 Radio and display receiver assembly
      A199*1 ECM
      I234*2 Stereo component amplifier assembly
      1. *1: for Gasoline Model
      2. *2: w/ Stereo Component Amplifier
    2. Measure the voltage according to the value(s) in the table below.
      GTY1180392Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Combination Meter Assembly)
      NOTE:
      • Make sure to perform this inspection with the wheels stopped.
      • Perform the inspection from the back of the connector with the connector connected.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      I4-8 (+S) - Body ground Ignition switch ON 4.5 to 14 V
    3. Repeat steps (a) and (b) for each connected ECU.

      HINT: 

      If the waveform changes to the waveform shown in the illustration 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 radio and display receiver assembly, the voltage changed to the specified voltage B
      When disconnecting the connector of the ECM, the voltage changed to the specified voltage C
      When disconnecting the connector of the stereo component amplifier assembly, the voltage changed to the specified voltage D

    Result: 

    B 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    C 

    REPLACE ECM 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    D 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    A 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY) 
    1. Disconnect the I4 combination meter assembly connector.
    2. Disconnect the I55 radio and display receiver assembly connector.
    3. Disconnect the A199*1 ECM connector.
      1. *1: for Gasoline Model
    4. Disconnect the I234 stereo component amplifier assembly connector.*1
      1. *1: w/ Stereo Component Amplifier
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I55-8 (SPD) - I4-8 (+S) Always Below 1 Ω
      A199-93 (SPD)*1 - I4-8 (+S) Always Below 1 Ω
      I234-11 (SPD)*2 - I4-8 (+S) Always Below 1 Ω
      A199-93 (SPD)*1, I55-8 (SPD), I234-11 (SPD)*2 or I4-8 (+S) - Body ground Always 10 kΩ or higher
      1. *1: for Gasoline Model
      2. *2: w/ Stereo Component Amplifier

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Result

      Result Proceed to
      w/ Smart Key System A
      w/o Smart Key System B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  7

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

      Body Electrical > Power Source Control > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output (for Gasoline Model) A
      DTCs are not output (for HEV Model) B
      DTCs are output C

    Result: 

    B 

    GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2022 - ]

    Result: 

    C 

    GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

    Result: 

    A 

    See step  8

  8. INSPECT COMBINATION METER ASSEMBLY 

    HINT: 

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

    1. Remove the combination meter assembly.

      Refer to REMOVAL [11/2023 - ]

    2. Check the internal resistance of the combination meter.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Check Terminal Tester Connection Condition Specified Condition
        I4-6 (IG+) - I4-25 (SI)
        • Tester (+) → I4-6 (IG+)
        • Tester (-) → I4-25 (SI)
        		 Always A
        I4-6 (IG+) - I4-25 (SI)
        • Tester (+) → I4-25 (SI)
        • Tester (-) → I4-6 (IG+)
        		 Always B

        OK

        The values of measured value A and measurement B diverge significantly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the I4 combination meter assembly connector.
    2. Disconnect the I222 certification ECU (smart key ECU assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I222-28 (SPDO) or I4-25 (SI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) (SHORT TO GROUND) 
    GTY1118508Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Skid Control ECU (Brake Actuator Assembly))
    1. Disconnect the skid control ECU (brake actuator assembly) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A151-33 (SP1) - Body ground Ignition switch off 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    NG 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the I4 combination meter assembly connector.
    2. Disconnect the A151 skid control ECU (brake actuator assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A151-33 (SP1) or I4-25 (SI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Result

      Result Proceed to
      w/ Smart Key System A
      w/o Smart Key System B

    Result: 

    B 

    See step  15

    Result: 

    A 

    See step  13

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

      Body Electrical > Power Source Control > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output (for Gasoline Model) A
      DTCs are not output (for HEV Model) B
      DTCs are output C

    Result: 

    B 

    GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2022 - ]

    Result: 

    C 

    GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

    Result: 

    A 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the I222 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
      I222-28 (SPDO) - I4-25 (SI) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A151 skid control ECU (brake actuator 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
      A151-33 (SP1) - I4-25 (SI) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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