POWER STEERING SYSTEM EPS Warning Light Circuit

DESCRIPTION

If the power steering ECU detects a malfunction, the P/S warning light comes on. At this time, the power steering ECU stores a DTC in its memory.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

   
   

   1. Check for DTCs Click here.

      OK
      DTC is not output.

   
   

   NG

   GO TO CAN COMMUNICATION SYSTEM Click here

   OK

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

   
   

   1. Disconnect the connectors from the power steering ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition L54-6 (IG) - A27-2 (PGND) 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 A27-2 (PGND) - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER

   
   

   1. Turn the power switch off.

   2. Connect the intelligent tester to the DLC3.

   3. Turn the power switch on (IG).

   4. Turn the intelligent tester on.

   5. Enter the following menus: Body / Combination Meter / Active Test.

   6. Perform the Active Test of the combination meter using the intelligent tester.

      Combination Meter

      Tester Display	Test Part	Control Range	Diagnostic Note
      Indicat. EPS	EPS warning light	OFF or ON	Confirm that the vehicle is stopped with the engine idling

   7. Check that the EPS warning light operates in accordance with the Active Test.

      Tech Tips

      Reconnect the connectors and restore the vehicle to its previous condition before checking the combination meter.

   
   

   NG

   REPLACE MATER CIRCUIT PLATE NO.3 Click here

   OK

   REPLACE POWER STEERING ECU Click here