Toyota 4Runner: ECU Power Source Circuit

Toyota 4Runner Service Manual / Suspension / Tire Pressure Monitoring / Tire Pressure Warning System / 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 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 ).

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (ECU - BATTERY)

(a) Disconnect the F7 ECU connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F7-7 (IG) - Body ground	Ignition switch ON	11 to 14 V
F7-7 (IG) - Body ground	Ignition switch off	Below 1 V

Text in Illustration

*a	Front view of wire harness connector (to Tire Pressure Warning ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (ECU - BODY GROUND)

(a) Disconnect the F7 ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F7-9 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Tire Pressure Warning ECU)

REPLACE TIRE PRESSURE WARNING ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

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 ...

TC and CG Terminal Circuit

DESCRIPTION DTC output mode is set by connecting terminals 13 (TC) and 4 (CG) of the DLC3. The DTCs are output by the blinking of the tire pressure warning light. WIRING DIAGRAM HINT: When eac ...

Other materials about Toyota 4Runner:

Vehicle Lift And Support Locations
VEHICLE LIFT AND SUPPORT LOCATIONS 1. NOTICE ABOUT VEHICLE CONDITION WHEN RAISING VEHICLE (a) The vehicle must be unloaded before jacking up or raising the vehicle. Never jack up or raise a heavily loaded vehicle. (b) When removing any heavy components li ...

Steering Angle Sensor
Components COMPONENTS ILLUSTRATION Removal REMOVAL PROCEDURE 1. PLACE FRONT WHEELS FACING STRAIGHT AHEAD 2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) b ...