Dtc C2191/91 Vehicle Speed Signal Error (Test Mode Dtc)

Suspension. Corolla. Zre142 Aze141
Tire Pressure Monitoring. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (VEHICLE SPEED)

INSPECT TIRE PRESSURE WARNING ECU (SPD SIGNAL)

CHECK HARNESS AND CONNECTOR (ECU - COMBINATION METER)

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


DESCRIPTION

The tire pressure warning ECU receives a vehicle speed signal from the combination meter. This DTC is stored upon entering test 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.

DTC No.
DTC Detection Condition
Trouble Area
C2191/91
Test mode procedure is performed
  1. Combination meter
  2. Vehicle speed sensor
  3. Wire harness or connector
  4. Tire pressure warning ECU

WIRING DIAGRAM


Corolla. Zre142 Aze141.Tire Pressure Monitoring.Tire Pressure Warning System. Dtc C2191/91 Vehicle Speed Signal Error (Test Mode Dtc)


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using Techstream and write them down before removal.
  2. It is necessary to perform initialization (COROLLA_ZRE142 RM000000XMZ07PX.html) after registration (COROLLA_ZRE142 RM000000XN108OX.html) of the transmitter IDs into the tire pressure warning ECU if the ECU has been replaced.
1.READ VALUE USING TECHSTREAM (VEHICLE SPEED)

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

  1. Check that the values indicated on the Techstream and on the combination meter are the same.

    Tire Pressure Monitor
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Vehicle Speed
    		Vehicle speed/
    min.: 0 km/h (0 mph)
    max.: 255 km/h (158 mph)
    		Almost same as actual vehicle speed
    		Speed indicated on combination meter
    OK:
    Vehicle speed indicated on the Techstream and on the combination meter are the same.


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (COROLLA_ZRE142 RM000000UZ108OX.html)

2.INSPECT TIRE PRESSURE WARNING ECU (SPD SIGNAL)


    Corolla. Zre142 Aze141.Tire Pressure Monitoring.Tire Pressure Warning System. Dtc C2191/91 Vehicle Speed Signal Error (Test Mode Dtc)

  1. Disconnect the E94 ECU connector.

  1. Jack up the vehicle.

  1. Shift the lever to the neutral position.

  1. Turn the ignition switch to ON.

  1. Check the waveform of the ECU connector using an oscilloscope while turning the wheel slowly.

    OK:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E94-2 (SPD) - E94-9 (GND)
    		Ignition switch ON
    		Correct waveform appears as shown
    Tool Setting
    Item
    		Contents
    Tool Setting
    		5 V/DIV., 20 ms/DIV.
    Vehicle Condition
    		Driving wheels rotating slowly
    HINT:
    The wavelength becomes shorter as the vehicle speed increases.


NG
Go to step 3
OK

REPLACE TIRE PRESSURE WARNING ECU (COROLLA_ZRE142 RM0000024T8027X.html)

3.CHECK HARNESS AND CONNECTOR (ECU - COMBINATION METER)


    Corolla. Zre142 Aze141.Tire Pressure Monitoring.Tire Pressure Warning System. Dtc C2191/91 Vehicle Speed Signal Error (Test Mode Dtc)

  1. Disconnect the E94 ECU connector.

  1. Disconnect the E46 meter connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E94-2 (SPD) - E46-36 (+S)
    		Always
    		Below 1 Ω
    E94-2 (SPD) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMBINATION METER (COROLLA_ZRE142 RM0000024D7032X.html)