TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2174/74, C2191/91

DTC Code DTC Name
C2174/74 Vehicle Speed Signal Malfunction
C2191/91 Vehicle Speed Signal Error (Test Mode DTC)

DESCRIPTION

Speed signals are input into the tire pressure warning ECU and receiver from the combination meter assembly. At the same time, the acceleration sensor in the tire pressure warning valve and transmitter detects driving conditions, and sends signals to the tire pressure warning ECU and receiver. If the speed signal from the combination meter assembly stops and the acceleration sensor signal in the tire pressure warning valve and transmitter indicates that the vehicle is being driven, DTC C2174/74 is stored.

DTC C2191/91 is stored only during the test mode.

DTC Code Detection Condition Trouble Area
C2174/74 Vehicle speed signal malfunction

  • Combination meter assembly

  • Vehicle speed signal circuit

  • Wire harness or connector

  • Tire pressure warning ECU and receiver

  • Tire pressure warning valve and transmitter
C2191/91 Test mode procedure is performed

  • Combination meter assembly

  • Vehicle speed signal circuit

  • Wire harness or connector

  • Tire pressure warning ECU and receiver

  • Tire pressure warning valve and transmitter

WIRING DIAGRAM

A0042LRE01

INSPECTION PROCEDURE

Note


  • When replacing the tire pressure warning ECU and receiver, read the transmitter IDs stored in the old ECU using the GTS and write them down before removal.

  • It is necessary to perform initialization Click here after registration Click here of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU and/or one of the valve and transmitters has been replaced.

Tech Tips

When the speedometer is not moving, first troubleshoot the meter / gauge system Click here.

PROCEDURE


  1. READ VALUE USING DATA LIST (VEHICLE SPEED)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

    6. Check that the values indicated on the GTS and on the combination meter are the same.

      Tire Pressure Monitor
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Vehicle Speed

      Vehicle speed reading/

      min.: 0 km/h (0 mph)

      max.: 255 km/h (158 mph)

      		 Actual vehicle speed Speed indicated on the combination meter assembly
      OK
      Vehicle speed indicated on the GTS indicates the actual speed.

    NG

    CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - JUNCTION BLOCK) Click here

    OK

  2. CHECK DTC OUTPUT (C2174/74)


    1. Perform a driving test.

    2. Check for DTCs Click here.

      Tech Tips

      The time required for DTC C2174/74 to be stored is 20 minutes.

      Result
      Result Proceed to
      DTC C2174/74 is not output A
      DTC C2174/74 is output B

    B

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - JUNCTION BLOCK)


    1. Disconnect the R30 tire pressure warning ECU and receiver connector.

    2. for LHD:

      Disconnect the 3B No. 3 junction block connector.

      A0043JDE01

    3. for LHD:

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      R30-2 (SPD) - 3B-1 Always Below 1 Ω
      R30-2 (SPD) or 3B-1 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *A for LHD
      *a

      Front view of wire harness connector

      (to No. 3 Junction Block)

    4. for RHD:

      Disconnect the 4A No. 4 junction block connector.

      A00441GE08

    5. for RHD:

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      R30-2 (SPD) - 4A-34 Always Below 1 Ω
      R30-2 (SPD) or 4A-34 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *A for RHD
      *a

      Front view of wire harness connector

      (to No. 4 Junction Block)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    GO TO SPEED SIGNAL CIRCUIT IN METER / GAUGE SYSTEM Click here

  4. REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER


    1. Replace the tire pressure warning ECU and receiver Click here.


    NEXT

  5. REGISTRATION OF TRANSMITTER ID


    1. Perform registration Click here.


    NEXT

  6. PERFORM INITIALIZATION


    1. Perform initialization Click here.


    NEXT

  7. CHECK DTC OUTPUT (C2174/74)


    1. Perform a driving test.

    2. Check for DTCs Click here.

      Tech Tips

      The time required for DTC C2174/74 to be stored is 20 minutes.

      Result
      Result Proceed to
      DTC C2174/74 is output A
      DTC C2174/74 is not output B

    B

    END

    A

    REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER Click here