EPS Warning Light Circuit: Procedure

1. Check for DTCs. Refer to DIAGNOSIS SYSTEM [08/2012 - ] .

   OK

   DTC is not output.

NG → See step   6 

OK: Go to next step 

1. Disconnect the connectors from the power steering ECU assembly.
   Fig 1: Identifying H25 And A26 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H25-6 (IG) - A26-2 (PGND)	Power switch on (IG)	9 to 16 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A26-2 (PGND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Power Steering ECU Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the power switch off.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / Combination Meter / Active Test.
6. Perform the Active Test of the combination meter assembly using the Techstream.
   COMBINATION METER
   
   

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

7. Check that the P/S warning light operates in accordance with the Active Test.

   HINT: 

   Reconnect the connectors and restore the vehicle to the condition it was in before checking the combination meter assembly.

NG → See step   4 

OK → See step   5