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

The tire pressure warning ECU receives a 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 after 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.

PROCEDURE

1. READ VALUE USING DATA LIST (VEHICLE SPEED)
(a) Turn the ignition switch OFF.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch ON and 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 Techstream indicates the actual speed.

Result





B -- USE SIMULATION METHOD TO CHECK
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (ECU - COMBINATION METER)
(a) Disconnect the T15 ECU connector.





(b) Disconnect the C10 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 -- GO TO METER / GAUGE SYSTEM