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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 770 (ENGINE CONTROL SYSTEM - DIAGNOSIS)CIRCUIT INSPECTIONIACV CONTROL CIRCUITINSPECTION PROCEDUREOBD SCAN TOOL (EXCLUDING HAND-HELD TESTER)
2004 Toyota Matrix XR, FWD, Standard

OBD scan tool (excluding hand-held tester)

2004 Toyota Matrix XR, FWD, StandardSECTION OBD scan tool (excluding hand-held tester)
WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check VSV for ACIS (See  INSPECTION  ). 
    1. NG: Replace VSV for ACIS. 
    2. OK: Go to next step. 
  2. Check voltage between terminal ACIS of ECM connector and body ground. 

    PREPARATION: 

    1. Remove the engine room ECM cover.
    2. Turn the ignition switch ON.

    CHECK: 

    Measure the voltage between terminals ACIS of the ECM connector and body ground.

    Fig 1: Measuring Voltage Between Terminals ACIS Of ECM Connector & Body Ground
    G01496512Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    Voltage: 9 to 14 V 

    1. NG: Go to step   4 . 
    2. OK: Go to next step. 
  3. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG: Repair or replace harness or connector. 
    2. OK: Go to next step. 
  4. Check vacuum hose. 

    CHECK: 

    1. Check that the vacuum hoses are connected correctly.
    2. Check that the vacuum hoses are not loose or disconnected.
    3. Check the vacuum hoses for cracks, holes or damage.
    1. NG: Repair or replace vacuum hose. 
    2. OK: Go to next step. 
  5. Check intake air control valve (See  ACOUSTIC CONTROL INDUCTION SYSTEM (ACIS)  ). 
    1. NG: Replace intake air control system. 
    2. OK: Replace ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  .) 
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.