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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 471 (ENGINE CONTROLS - DIAGNOSTICS)CIRCUIT INSPECTIONFUEL PUMP CONTROL CIRCUITINSPECTION PROCEDUREOBD II SCAN TOOL (EXCLUDING HAND-HELD TESTER)
2004 Toyota Matrix XR, FWD, Standard

OBD II scan tool (excluding hand-held tester)

2004 Toyota Matrix XR, FWD, StandardSECTION OBD II scan tool (excluding hand-held tester)
WARNING: This page is about a different car, the 2004 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check fuel pump operation (see Check fuel pressure (see  ON-VEHICLE INSPECTION  ).  

    CHECK: 

    Check if there is pressure in the fuel inlet hose.

    HINT:

    The pipe has fuel pressure if the sound of flowing fuel can be heard.

    1. NG : Proceed to next circuit inspection shown on problem symptoms table (see  PROBLEM SYMPTOMS TABLE  ).  
    2. OK : Go to next step. 
  2. Check operation circuit opening relay (Marking: C/OPN). 

    PREPARATION: 

    Connect between terminal FC of the ECM connector and the body ground.

    CHECK: 

    Check the relay operation.

    OK: 

    Noise can be heard from the circuit opening relay. 

    Fig 1: Checking Voltage Between Body Ground And Terminal FC (+)
    G02912628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Go to step   6 . 
    2. OK : Go to next step. 
  3. Check circuit opening relay (Marking: C/OPN). 

    PREPARATION: 

    Remove the circuit opening relay from the engine room J/B.

    CHECK: 

    Measure the circuit opening relay.

    OK: 

    EFI RELAY

    Tester Connection Specified Condition
    3 - 5 10 kΩ or higher
    3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)
    Fig 2: Identifying C/OPN Relay
    G02912629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Replace circuit opening relay. 
    2. OK : Go to next step. 
  4. Check voltage between terminal FC of ECM connector and body ground. 

    PREPARATION: 

    1. Remove the glove compartment (see COMPONENTS ).
    2. Turn the ignition switch ON.

    CHECK: 

    Measure the voltage between terminal FC of the ECM connector and body ground.

    OK: 

    Voltage: 9 to 14V 

    Fig 3: Checking Voltage Between Body Ground and Terminal FC (+)
    G02912630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : Replace ECM (see  COMPONENTS  ).  
    2. NG : Go to next step. 
  5. Check for open in wire harness between circuit opening relay (Marking: C/OPN) and fuel pump, and fuel pump and body ground (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  in INTRODUCTION article).  
    1. NG : Repair or replace harness and connector. 
    2. OK : Go to next step. 
  6. Check fuel pump (see Check fuel pressure (see  ON-VEHICLE INSPECTION  ).  
    1. NG : Repair or replace fuel pump. 
    2. OK : Go to next step. 
  7. Check for open in wire harness between circuit opening relay (Marking: C/OPN) and fuel pump, and fuel pump and body ground (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  in INTRODUCTION article).  
    1. NG : Repair or replace harness and connector. 
    2. OK : Replace ECM (see  COMPONENTS  ).  
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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.