Toyota 4Runner: VFC Solenoid Circuit (C15F0)

Toyota 4Runner Service Manual / Steering / Power Assist Systems / Power Steering System / VFC Solenoid Circuit (C15F0)

DESCRIPTION

This circuit supplies electric power to the power steering solenoid valve.

The power steering ECU assembly controls the output current to the power steering solenoid valve in accordance with the steering angle signal, steering zero point memory, vehicle speed signal and engine speed signal, adjusting the amount of power steering assist.

DTC Code	DTC Detection Condition	Trouble area
C15F0	A short or open in the solenoid valve circuit.	Harness or connector Vane pump assembly Power steering ECU assembly

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM (SOLENOID CURRENT)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / PPS / Data List.

PPS

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Solenoid Current	Solenoid Current/ Min.: 0 mA Max.: 1000 mA	200 to 950 mA	The engine is running and the steering wheel is being turned.

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Solenoid Current

Solenoid Current/

Min.: 0 mA

Max.: 1000 mA

200 to 950 mA

The engine is running and the steering wheel is being turned.

OK:

The normal condition value is displayed on the Techstream.

REPLACE POWER STEERING ECU ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - POWER STEERING SOLENOID VALVE)

(a) Disconnect the F41 power steering ECU assembly connector.

(b) Disconnect the B40 power steering solenoid valve connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F41-7 (SOF+) - B40-2	Always	Below 1 Ω
F41-8 (SOF-) - B40-1	Always	Below 1 Ω
F41-7 (SOF+) or B40-2 - Body ground	Always	10 kΩ or higher
F41-8 (SOF-) or B40-1 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT POWER STEERING SOLENOID VALVE ASSEMBLY

(a) Disconnect the B40 power steering solenoid valve connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	6.7 to 7.3 Ω

(c) Connect the positive (+) lead of the battery with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.

OK:

Valve moves and makes an operating noise.

Text in Illustration

*a	Component without harness connected (Power Steering Solenoid Valve)

REPLACE POWER STEERING ECU ASSEMBLY

REPLACE VANE PUMP ASSEMBLY

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