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

Speeds signals are sent from the combination meter assembly to the tire pressure warning ECU and receiver.

DTC C2191/91 is stored only during the signal check.

DTC No. Detection Item DTC Detection Condition Trouble Area
C2174/74 Vehicle Speed Signal Malfunction

All conditions below are met:


  • DTC C2121/21, C2122/22, C2123/23, C2124/24 and/or C2125/25 is output

  • 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 Vehicle Speed Signal Error (Test Mode DTC) Test mode procedure is performed.

  • Meter / gauge system (speed signal)

  • Vehicle speed signal circuit

  • Wire harness or connector

  • Tire pressure warning ECU and receiver

WIRING DIAGRAM

B003LWRE02

CAUTION / NOTICE / HINT

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 after registration Click here of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

Tech Tips

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

Click here

PROCEDURE


  1. READ VALUE USING DATA LIST (VEHICLE SPEED)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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


      Chassis > Tire Pressure Monitor > Data List
      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

      Chassis > Tire Pressure Monitor > Data List
      Tester Display
      Vehicle Speed

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

      OK
      Vehicle speed indicated on the GTS indicates the actual speed.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - COMBINATION METER ASSEMBLY) Click here

    OK

  2. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Chassis > Tire Pressure Monitor > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON.

    4. Perform a driving test.

    5. Check for DTCs.

      Click here


      Chassis > Tire Pressure Monitor > Trouble Codes

      Tech Tips

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

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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO STEP 6 Click here

  3. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - COMBINATION METER ASSEMBLY)


    1. Turn the ignition switch off.

    2. Disconnect the N54 tire pressure warning ECU and receiver connector.

    3. Disconnect the G8 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N54-2 (SPD) - G8-19 (+S) Always Below 1 Ω
      N54-2 (SPD) or G8-19 (+S) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY OR SPEEDOMETER SENSOR)


    1. w/o VSC:

      Disconnect the A68 skid control ECU (brake actuator assembly) connector.

      w/ VSC:

      Disconnect the A4 skid control ECU (brake actuator assembly) connector.

    2. Disconnect the G8 combination meter assembly connector.

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

      Standard Resistance
      w/o VSC:
      Tester Connection Condition Specified Condition
      A68-22 (SP1) - G8-18 (SI) Always Below 1 Ω
      A68-22 (SP1) or G8-18 (SI) - Body ground Always 10 kΩ or higher
      w/ VSC:
      Tester Connection Condition Specified Condition
      A4-14 (SP1) - G8-18 (SI) Always Below 1 Ω
      A4-14 (SP1) or G8-18 (SI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK DTC OUTPUT (ENGINE CONTROL SYSTEM)


    1. Clear the DTCs.



      Powertrain > Engine and ECT > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON.

    4. Check for DTCs.



      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC P0500 is not output A
      DTC P0500 is output B

    B

    GO TO METER / GAUGE SYSTEM Click here

    A

  6. REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER


    1. Replace the tire pressure warning ECU and receiver.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. REGISTRATION OF TRANSMITTER ID


    1. Perform registration.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. PERFORM INITIALIZATION


    1. Set the tire pressure to the specified value.

      Click here

    2. Perform initialization.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK TEST MODE DTC (C2191/91)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Tire Pressure Monitor / Utility / Signal Check.


      Chassis > Tire Pressure Monitor > Utility
      Tester Display
      Signal Check

    6. Drive the vehicle at 20 km/h (12 mph) or more for 3 seconds or more to check the vehicle speed signal (C2191/91).

      Result
      Result Proceed to
      DTC C2191 is not cleared A
      DTC C2191 is cleared B

    A

    GO TO DTC C2121/21 TO C2125/25 Click here

    B

    END