POWER ASSISTED SYSTEM (POWER STEERING) (DIAGNOSTICS) > STEERING Warning Light

1. POWER STEERING ASSIST ENABLED

DETECTING CONDITION:

• Defective combination meter

• Defective harness

TROUBLE SYMPTOM:

When the ignition switch is turned to ON (engine OFF), the steering warning light does not illuminate.

NOTE:

It is operating normally if the warning light illuminates when the ignition switch is turned to ON (engine OFF), and turns off approximately two seconds after engine start.

STEP	CHECK	YES	NO
1.CHECK ILLUMINATION OF OTHER LIGHTS. Turn the ignition switch to ON. (engine OFF)	Do other warning lights illuminate?		Check the combination meter.
2.CHECK LAN SYSTEM. Perform the diagnosis for LAN system using the Subaru Select Monitor.	Is a DTC of low-speed CAN displayed?	Perform the diagnosis according to DTC.
3.CHECK COMBINATION METER. Perform the self-diagnosis of combination meter.	Is the self diagnosis normal?	The combination meter is normal.	Check the combination meter.

2. POWER STEERING ASSIST DISABLED

DETECTING CONDITION:

• Torque sensor connector has come off.

• CAN communication error (Engine rpm signal not received)

TROUBLE SYMPTOM:

The steering warning light is normal but there is no power steering assist (steering feels heavy).

NOTE:

• Power steering assist is not started in any of the following cases.

1. Power steering assist is not started unless the ignition switch ON signal or engine speed signal is input.

2. If the torque sensor connector is disconnected, the torque sensor signal on the power steering control module side will be fixed at approximately 2.5 V and the assist will not be started. This is not identified as a malfunction by the system.

• In any of the following cases, the power steering assist is limited and steering wheel operation may become heavy.

If the steering wheel is held to an end for a long time, or the steering wheel turning to right and left at slow speed is repeated during parking, the assist limitation (overheat protection control) may operate to prevent failures by overheat.

In this case, by stopping the engine for approx. 30 minutes for cooling, the assist will start operating. While assist limitation (overheat protection control) is in active, “Assist limitation” is displayed in the «EPS operation flag» in the Subaru Select Monitor “Current Data Display & Save”.

• The overheat protection control system is normal operation, therefore, the steering warning light will not come on and there will be no DTC displayed.

• If the power steering system connector is disconnected while cooling under the overheat protection control, different DTC may be recorded. If there is no DTC and assist limitation is in active, stop the engine for approx. 30 minutes for cooling.

STEP	CHECK	YES	NO
1.CHECK CURRENT DATA. Using the Subaru Select Monitor, display «EPS operation flag».	Is “Assist limitation” displayed?	Stop the engine for approx. 30 minutes, and cool down the power steering control module. After cooling down, perform the step 1 again.
2.CHECK DTC. Read the DTC of the power steering control module using Subaru Select Monitor.	Is DTC displayed?	Perform the diagnosis according to DTC.
3.CHECK CURRENT DATA. 1) Using the Subaru Select Monitor, display «Torque Sensor main» and «Torque Sensor sub». 2) Move the steering wheel to the left and right.	Do the torque sensor values change?		Check the torque sensor circuit.
4.CHECK CURRENT DATA. 1) Start the engine. 2) Using the Subaru Select Monitor, display «Engine Speed».	Is the engine speed signal the same as that in the combination meter?	Replace the power steering control module.	Check the CAN communication.