Inspection Procedure

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. 

NG: Go to step 2 

OK : CHECK FOR INTERMITTENT PROBLEMS  (See HOW TO PROCEED WITH TROUBLESHOOTING )

1. Remove the ECU-IG fuse from the main body ECU.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   ECU-IG fuse	Always	Below 1 Ω

NG: CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

Fig 1: Identifying ECU-IG Fuse From Main Body ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 2: Identifying A19 And F30 Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : REPLACE POWER STEERING ECU  (See REMOVAL  )