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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 349 (Electric Motor Power Steering - Diagnostics) >> Circuit Inspection >> DTC C1521/21-C1524/24: Motor Circuit Malfunction >> Inspection Procedure

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.
  1. Check voltage between terminals M1 and M2 of EMPS ECU connector  .

    PREPARATION

    • Remove the EMPS ECU with connectors still connected.
    • Turn the ignition switch ON.

    CHECK:  Turn the steering wheel to left and right and measure the voltage between terminals M1 and M2 of EMPS ECU connector.

    Fig 1: Locating & Voltage Testing EMPS ECU Terminals M1 & M2
    G01112708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Voltage: 9-14V 

    1. NG:  Check and replace the EMPS ECU. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
    2. OK:  Go to  2.
  2. Check for open and short circuit in harness and connector between terminals M1 and M2 of EMPS ECU connector  . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
    1. NG:  Repair or replace harness or connector.
    2. OK:  Go to  3.
  3. Check continuity between terminal M1 and M2 of motor connector  .

    PREPARATION:  Disconnect the connector from the motor.

    CHECK:  Measure the resistance between terminals M1 and M2 of motor connector.

    Fig 2: Resistance Testing Motor Terminals M1 & M2
    G01112709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Resistance: 0.1-1 Ohms 

    1. NG:  Check and replace power steering gear assembly with motor. See STEP 12 - REMOVE ELECTRIC POWER STEERING GEAR .
    2. OK:  Check and replace the EMPS ECU. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
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