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. |
|
WIRING DIAGRAM
PROCEDURE
1. |
READ VALUE USING TECHSTREAM (SOLENOID CURRENT) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(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. |
OK:
The normal condition value is displayed on the Techstream.
OK | ![]() |
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.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F41-7 (SOF+) - B40-2 |
Always |
Below 1 Ω |
F41-8 (SOF-) - B40-1 |
||
F41-7 (SOF+) or B40-2 - Body ground |
Always |
10 kΩ or higher |
F41-8 (SOF-) or B40-1 - Body ground |
NG | ![]() |
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) |
OK | ![]() |
REPLACE POWER STEERING ECU ASSEMBLY |
NG | ![]() |
REPLACE VANE PUMP ASSEMBLY |
Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) When troubleshooting a vehicle with a diagnosis system, connect the Techstream
to the DLC3 of the vehicle and read various data output from the steering lock actuator
assembly (steering lock ECU).
The steering lock ac ...
Removal
REMOVAL
PROCEDURE
1. DRAIN ENGINE COOLANT
(a) Drain engine coolant (See page ).
2. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM
3. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the cable from ...