Inspection Procedure

1. Using a Techstream, check for DTCs and confirm that there are no problems in the CAN communication system.

   OK: DTCs are not output. 

NG: GO TO CAN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

OK: Go to Next Step 

1. Connect a Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Chassis / EMPS / Data List.
5. Select the item "IG Power Supply" in the Data List and read the value displayed on the Techstream.

   EMPS: 

   DATA LIST REFERENCE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   IG Power Supply	ECU power source voltage: Minimum: 0 V, Maximum: 20.1531 V	11 to 14 V: Ignition switch ON	-

   OK: The normal condition value is displayed on the Techstream. 

   HINT:

   If the voltage is not standard value, inspect the IG power source circuit (See DTC C1551/51 IG POWER SOURCE CIRCUIT MALFUNCTION  ).

NG: INSPECT IG POWER SOURCE CIRCUIT  (See DTC C1551/51 IG POWER SOURCE CIRCUIT MALFUNCTION  )

OK: Go to Next Step 

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

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   F30-6 (IG) - Body ground	Ignition switch ON	11 to 14 V

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

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   A19-2 (PGND) - Body ground	Always	Below 1 Ω

   Fig 1: Identifying A19 And F30 Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Replace the power steering ECU (See REMOVAL  ).
   NOTE: After replacing the power steering ECU, perform the torque sensor zero point calibration (See CALIBRATION  ).

1. Check that the PS warning light comes on for 3 seconds after the ignition switch is turned to ON.

   OK: The PS warning light operates normally. 

NG: REPLACE COMBINATION METER  (See REMOVAL )

OK : END