Toyota 4Runner: Tire Pressure Warning Light Circuit

Toyota 4Runner Service Manual / Suspension / Tire Pressure Monitoring / Tire Pressure Warning System / Tire Pressure Warning Light Circuit

DESCRIPTION

If the tire pressure warning ECU detects a disconnected connector or an open circuit between the tire pressure warning ECU and combination meter, the tire pressure warning light turns off 10 seconds after the ignition switch is turned to ON, blinks for 1 minute, and then remains on.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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 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.	CHECK HARNESS AND CONNECTOR (COMBINATION METER - TIRE PRESSURE WARNING ECU)

(a) Disconnect the F14 meter connector.

(b) Disconnect the F7 ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F7-5 (IND) - F14-9 (TIRE)	Always	Below 1 Ω
F7-5 (IND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK COMBINATION METER

(a) Disconnect the F7 ECU connector.

(b) Turn the ignition switch to ON and check the condition of the tire pressure warning light illumination.

Result

Result	Proceed to
Turns on after blinking for 1 minute	A
Does not turn on after blinking for 1 minute	B

REPLACE TIRE PRESSURE WARNING ECU

REPLACE COMBINATION METER ASSEMBLY

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

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 ...

ECU Power Source Circuit

DESCRIPTION This is the power source for the tire pressure warning ECU. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: When replacing the tire pressure warning ECU, read the IDs stored ...

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