Inspection Procedure

1. Check the indication condition of the P/S warning light while by wiggling the power steering ECU assembly connector and wire harness up and down, and then right and left.

OK: P/S warning light indication condition does not change. 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the CAN communication system (See DIAGNOSIS SYSTEM ).

   OK: DTCs are not output. 

   NG:  GO TO CAN COMMUNICATION SYSTEM

   OK: Go to next step 

1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the multiplex communication system (BEAN) (See DTC CHECK / CLEAR ).

   OK: DTCs are not output. 

   NG:  GO TO MULTIPLEX COMMUNICATION SYSTEM (BEAN)

   OK: Go to next step 

1. Remove the ECU-IG No.1 fuse from the instrument panel J/B LH.
2. Check for continuity of the ECU-IG No.1 fuse.

   OK: Continuity 

   NG: REPLACE FUSE 

   OK: Go to next step 

1. Disconnect the P41 connector from the power steering ECU assembly.
2. Measure the voltage according to the value(s) in the table below.

   Voltage 

OK: GO TO step   7 

Fig 1: Identifying Power Steering ECU Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step 

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

   Resistance 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying Power Steering ECU Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (BETWEEN POWER STEERING ECU ASSEMBLY AND BATTERY) 

1. Replace the power steering ECU assembly (See POWER STEERING ECU ).

NEXT: Go to next step 

1. Check the P/S warning light status on the combination meter.

   Standard: 

   The P/S warning light is off. 

   OK: END 

   NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE