EPS Warning Light Circuit: Procedure

1. Check for DTCs. Refer to DIAGNOSIS SYSTEM .

   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: Checking L188 & A27 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
   L188-6 (IG) - Body ground	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
   A27-2 (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. Reconnect the power steering ECU assembly connector.
2. Perform the Active Test of the combination meter using the Techstream. Refer to DATA LIST / ACTIVE TEST .
3. Check the combination meter.

   OK

   The EPS warning light turns on or off in accordance with the Techstream operation.

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part. Refer to PROBLEM SYMPTOMS TABLE .

NG → See step   4 

OK → See step   5