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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 Always On: Malfunction In EMPS Ecu >> 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. Is DTC output? 

    Check DTC. See DIAGNOSTIC TROUBLE CODE CHART .

    1. YES:  Repair circuit indicated by output code.
    2. NO:  Go to  2.
  2. Is normal code displayed? 
    1. YES:  Check and replace EMPS ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
    2. NO:  Go to  3.
  3. Does PS warning light go off? 
    1. YES:  Check for open or short circuit in harness and connector between ECU-IG fuse and EMPS ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
    2. NO:  Go to  4.
  4. Check battery positive voltage  .

    PREPARATION:  Start the engine.

    CHECK:  The battery positive voltage.

    OK: Voltage: 9 - 14 V 

    1. NG:  Check and repair charging system.
    2. OK:  Go to  5.
  5. Check operation of PS warning light  .

    PREPARATION 

    1. Turn the ignition switch OFF.
    2. Disconnect the connector from the EMPS ECU.
    3. Turn the ignition switch ON.

    CHECK:  PS warning light goes OFF.

    1. OK:  Check and replace EMPS ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
    2. NG:  Check for short circuit in harness and connector between multi-information display and EMPS ECU, multi-information display and DLC3. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
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