C2173

TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: C2173/73: Vehicle Speed or Engine Speed Signal Malfunction
C2173/73 - Vehicle Speed or Engine Speed Signal Malfunction

DESCRIPTION

The tire pressure warning ECU receives a vehicle speed signal from the combination meter and an engine speed signal from the ECM. The tire pressure warning ECU uses these signals to detect DTCs C2121/21 to C2125/25 (No Signal from Transmitter in Main Mode) or DTCs C2131/31 to C2135/35 (No Signal from Transmitter in 2nd Mode) and C2177/77 (Initialization not Completed).





NOTICE:
When DTCs C2121/21 to C2125/25 (or DTCs C2131/31 to C2135/35) are stored in the tire pressure warning ECU, DTC C2173/73 may be stored simultaneously. In such cases, troubleshoot C2173/73 first, then troubleshoot DTCs C2121/21 to C2125/25 (or DTCs C2131/31 to C2135/35) C2121.

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 the initialization Initialization after the registration Registration of the transmitter IDs into the tire pressure warning ECU after the ECU has been replaced.
PROCEDURE

1. PERFORM SIGNAL CHECK (VEHICLE SPEED SIGNAL AND ENGINE SPEED SIGNAL)

(a) Enter the signal check mode in TEST MODE PROCEDURE Test Mode Procedure.

(b) Drive the vehicle at 20 km/h (12 mph) or more for 10 seconds to erase DTCs C2191/91 and C2194/94.

(c) Check for test mode DTCs.

Result:





HINT
DTCs C2181/81 to C2185/85 (Transmitter ID not Received) are output at this time, but they are not related to this check.

C -- GO TO DTC C2194/94 C2194

B -- GO TO DTC C2191/91 C2191

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting