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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 494 (ENGINE MECHANICAL)CO/HCINSPECTION
2004 Toyota Matrix XR, FWD, Standard

Section 494 (Engine Mechanical): Co/HC: Inspection

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection
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.

HINT:

This check is used only to determine whether or not the idle CO/HC complies with specifications.

  1. INITIAL CONDITIONS 
    1. Engine at normal operating temperature
    2. Air cleaner installed
    3. Air pipes and hoses of air induction system connected
    4. All accessories switched OFF
    5. All vacuum lines properly connected
    6. SFI system wiring connectors fully plugged
    7. Ignition timing check correctly
    8. Transmission in neutral position
    9. Tachometer and CO/HC meter calibrated by hand
  2. START ENGINE 
  3. RACE ENGINE AT 2,500 RPM FOR APPROX. 180 SECONDS 
  4. INSERT CO/HC METER TESTING PROBE AT LEAST 40 cm (1.3 ft) INTO TAILPIPE DURING IDLING 
    Fig 1: Inserting CO/HC Meter Testing Probe Into Tailpipe
    G02925355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. IMMEDIATELY CHECK CO/HC CONCENTRATION AT IDLE AND/OR 2,500 RPM 

    Complete the measuring within 3 minutes.

    HINT:

    When performing the 2 mode (2,500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.

    If the CO/HC concentration does not conform to specifications, perform troubleshooting in the order given below.

    1. Check the A/F sensor operation (see DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1) ).
    2. See Fig 2 for possible causes, and then inspect and correct the applicable causes if necessary.
      Fig 2: CO/HC Problems Causes Table
      G02925356Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.