Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

Check voltage between terminals TRQV and TRQG of EMPS ECU .
PREPARATION: Remove the EMPS ECU with connectors still connected.

CHECK: Measure the voltage between terminals TRQV and TRQG of EMPS ECU connector.

OK: Voltage: 4.5-5.5V

Fig 1: Testing EMPS ECU Terminals TRQV To TRQG Voltage
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check and replace the EMPS ECU. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
2. OK: Go to 2.
Check for open and short circuit in harness and connector between terminals TRQV and TRQG of EMPS ECU connector . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. NG: Repair and replace harness or connector.
2. OK: Go to 3.
Check voltage between terminals VT1 and GND, VT2 and GND of torque sensor connector .
PREPARATION: Remove the torque sensor with connectors still connected.

CHECK: Measure the voltage between terminals VT1 and GND, VT2 and GND of torque sensor connector.

OK , see Fig 2.

Fig 2: Identifying Steering Position VT1 & VT2 Specifications
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Locating & Testing Terminals VT1 & VT2
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check and replace power steering gear assembly with motor. See STEP 12 - REMOVE ELECTRIC POWER STEERING GEAR .
2. OK: Go to 4.
Check for open and short circuit in harness and connector between terminals VT1 of torque sensor connector and TRQ1 of EMPS ECU connector, VT2 of torque sensor connector and TRQ2 of EMPS ECU connector . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
1. NG: Repair and replace harness or connector.
2. OK: Check and replace EMPS ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .