POWER STEERING SYSTEM PS Warning Light Remains ON

DESCRIPTION

The power steering ECU is connected to the combination meter via CAN communication. If any of the following are detected, the PS warning light remains on.

• The power steering ECU connectors are disconnected from the power steering ECU.

• There is a malfunction in the power steering ECU internal circuit.

• There is an open in the harness between the combination meter and power steering ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (E/G RM-IG1-2)

   
   

   1. Remove the E/G RM-IG1-2 fuse from the engine room No. 2 relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition E/G RM-IG1-2 fuse Always Below 1 Ω

   
   

   NG

   REPLACE FUSE

   OK

2. CHECK HARNESS AND CONNECTOR

   
   

   1. Turn the power switch ON (READY).

   2. Check the indication condition of the PS warning light by wiggling the power steering ECU connector and wire harness up and down, and right and left.

      OK
      PS warning light indication condition does not change.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the CAN communication system Click here.

      Result

      DTC Condition	Proceed to
      DTC is not output	A
      for LHD: DTC is output	B
      for RHD: DTC is output	C

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

   C

   GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

   A

4. CHECK ELECTRONICALLY CONTROLLED BRAKE SYSTEM

   
   

   1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the electronically controlled brake system Click here.

      Result

      DTC Condition	Proceed to
      DTC is not output	A
      DTC is output	B

   
   

   B

   GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

   A

5. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BATTERY AND BODY GROUND)

   
   

   1. 

      Disconnect the A44 ECU connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition A44-9 (IG) - Body ground Power switch ON (IG) 11 to 14 V

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

      Standard resistance
      Tester Connection Condition Specified Condition A44-5 (PGND) - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

6. REPLACE POWER STEERING ECU

   
   

   1. Replace the power steering ECU Click here.

   2. After replacing the power steering ECU, check the illumination condition of the combination meter's PS warning light.

      OK
      PS warning light is illuminated when power switch is ON (IG), and goes off when power switch turned from ON (IG) to ON (READY).

      Note

      If replacing the power steering ECU, initialize the rotation angle sensor value and calibrate the torque sensor zero point Click here.

   
   

   NG

   GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

   OK

   END