C2191

TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: C2191/91: Vehicle Speed Signal Error (Test Mode DTC)

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.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using Techstream and write them down before removal.
- It is necessary to perform initialization (Initialization) after registration (Registration) of the transmitter IDs into the tire pressure warning ECU if the ECU and/or any of the valve and transmitters have been replaced.

PROCEDURE

1. READ VALUE USING TECHSTREAM (VEHICLE SPEED)
(a) Turn the ignition switch to the LOCK position.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch to the ON position and turn the tester on.
(d) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(e) Check that the values indicated on the tester and on the combination meter are the same.

Tire Pressure Monitor





OK:
Vehicle speed indicated on the tester and on the combination meter are the same.
NG -- INSPECT TIRE PRESSURE WARNING ECU (SPD SIGNAL)
OK -- USE SIMULATION METHOD TO CHECK
2. INSPECT TIRE PRESSURE WARNING ECU (SPD SIGNAL)





(a) Disconnect the T11 ECU connector.
(b) Jack up the vehicle.
(c) Shift the lever to the neutral position.
(d) Turn the ignition switch to the ON position.
(e) Check the waveform of the ECU connector using an oscilloscope while turning the wheel slowly.
OK:





Tool Setting





HINT: The wavelength becomes shorter as the vehicle speed increases.

NG -- CHECK HARNESS AND CONNECTOR (ECU - COMBINATION METER)
OK -- REPLACE TIRE PRESSURE WARNING ECU
3. CHECK HARNESS AND CONNECTOR (ECU - COMBINATION METER)





(a) Disconnect the T11 ECU connector.
(b) Disconnect the C11 meter connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE COMBINATION METER