C2191

TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: C2174/74: Vehicle Speed Signal Malfunction

DTC C2174/74 - Vehicle Speed Signal Malfunction

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

DESCRIPTION

Speed signals are input into the tire pressure warning ECU from the combination meter. At the same time, the G-SW in the tire pressure warning valve and transmitter detects driving conditions, and sends signals to the tire pressure warning ECU. If the speed signal from the combination meter stops and the G-SW 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 signal check.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using the 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 after the ECU and/or tire pressure warning valve and transmitter has been replaced.

HINT: When the speedometer needle is not moving, first troubleshoot the meter/gauge system (How To Proceed With Troubleshooting).

PROCEDURE

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

Tire Pressure Monitor





OK:
Vehicle speed indicated on the Techstream indicates the actual speed.
NG -- CHECK HARNESS AND CONNECTOR (ECU - COMBINATION METER)
OK -- Continue to next step.
2. CHECK DTC
(a) Perform a driving test.
(b) Check for DTCs.

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

Result





B -- REPLACE TIRE PRESSURE WARNING ECU
A -- USE SIMULATION METHOD TO CHECK
3. CHECK HARNESS AND CONNECTOR (ECU - COMBINATION METER)
(a) Disconnect the J31 tire pressure warning ECU connector.





(b) Disconnect the J28 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 -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - SKID CONTROL ECU)





(a) Disconnect the A17 skid control ECU connector.
(b) Disconnect the J28 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 -- Continue to next step.
5. CHECK DTC (SFI SYSTEM)
(a) Check for DTCs.

HINT:
- for 1GR-FE (DTC Check / Clear).
- for 2UZ-FE (DTC Check / Clear).
- for 3UR-FE (DTC Check / Clear).

Result





B -- REPLACE COMBINATION METER
A -- Continue to next step.
6. REPLACE TIRE PRESSURE WARNING ECU
(a) Replace the tire pressure warning ECU (Removal).
NEXT -- Continue to next step.
7. PERFORM REGISTRATION OF TRANSMITTER ID
(a) Perform registration (Registration).
NEXT -- Continue to next step.
8. PERFORM INITIALIZATION
(a) Perform initialization (Initialization).
NEXT -- Continue to next step.
9. CHECK DTC
(a) Perform a driving test.
(b) Check for DTCs.

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

Result





B -- END
A -- REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER