Toyota 4Runner: Vehicle Speed or Engine Speed Signal Malfunction (C2173/73)

Toyota 4Runner Service Manual / Suspension / Tire Pressure Monitoring / Tire Pressure Warning System / Vehicle Speed or Engine Speed Signal Malfunction (C2173/73)

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 store DTCs C2121/21 to C2124/24 or C2125/25*.

*: w/ Spare Tire Pressure Warning Valve and Transmitter

DTC Code	Detection Condition	Trouble Area
C2173/73	Either condition is met for a total of 15 minutes: (a) No engine speed signal while the vehicle speed is 8 km/h (5 mph) or more. (b) No vehicle speed signal while the engine speed is a specified value.	Combination meter assembly ECM Harness or connector Tire pressure warning ECU

DTC Code

Detection Condition

Trouble Area

C2173/73

Either condition is met for a total of 15 minutes:

(a) No engine speed signal while the vehicle speed is 8 km/h (5 mph) or more.

(b) No vehicle speed signal while the engine speed is a specified value.

Combination meter assembly
ECM
Harness or connector
Tire pressure warning ECU

HINT:

This DTC is stored at the same time DTCs C2121/21 to C2124/24 or C2125/25* are stored.

*: w/ Spare Tire Pressure Warning Valve and Transmitter

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using the Techstream and write them down before removal.
It is necessary to perform registration of the transmitter IDs into the tire pressure warning ECU after the ECU and/or the tire pressure warning valve and transmitter has been replaced (See page ).

PROCEDURE

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

(a) Enter signal check mode in the Test Mode Procedure (See page ).

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

Result

Result	Proceed to
DTCs C2191/91 and C2194/94 are cleared	A
DTC C2191/91 is output	B
DTC C2194/94 is output	C

HINT:

DTCs C2181/81 to C2184/84 or C2185/85* (Transmitter ID not Received) are output at this time, but they are not related to this check.

*: w/ Spare Tire Pressure Warning Valve and Transmitter

USE SIMULATION METHOD TO CHECK

GO TO DTC C2191/91

GO TO DTC C2194/94

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DESCRIPTION After all IDs are registered, DTC C2126/26 is stored in the tire pressure warning ECU and the tire pressure warning light blinks for 1 minute and then comes on. When the tire pressure ...

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