TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2191/91

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

DESCRIPTION

The tire pressure warning ECU and receiver receives vehicle speed signals from the combination meter assembly via CAN communication. This DTC is stored upon entering test mode (signal check mode), and cleared when a vehicle speed signal of 20 km/h (12 mph) is detected for 3 seconds or more. This DTC is output only in test mode (signal check mode).

DTC No. DTC Detection Condition Trouble Area
C2191/91 Vehicle speed signal circuit malfunction

  • CAN communication system

  • Vehicle speed signal circuit

  • Combination meter assembly

  • Tire pressure warning ECU and receiver

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 has been replaced.

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check if CAN communication system DTCs are output Click here.

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

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK VEHICLE SPEED SIGNAL (DATA LIST)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG) and turn the GTS on.

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

    5. Check that the values indicated on the GTS and on the combination meter assembly 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
      The vehicle speed displayed on the GTS changes depending on the actual vehicle speed.

    NG

    GO TO METER / GAUGE SYSTEM Click here

    OK

  3. CHECK TEST MODE DTC (C2191/91)


    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 / Utility / Signal Check.

    6. Perform the test mode inspection Click here.

      Result
      Result Proceed to
      DTC C2191/91 is cleared A
      DTC C2191/91 is not cleared B

    B

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    A

    USE SIMULATION METHOD TO CHECK Click here