SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 471 (ENGINE CONTROLS - DIAGNOSTICS)CIRCUIT INSPECTIONDTC P2A00: A/F SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1)INSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
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:

Hand-held tester only:

It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble areas are malfunctioning or not.

Perform the ACTIVE TEST A/F CONTROL operation.

HINT:

A/F CONTROL operation lowers the injection volume 12.5% or increases the injection volume 25%.

  1. Connect the hand-held tester to the DLC3 on the vehicle.
  2. Turn the ignition switch ON.
  3. Warm up the engine with the engine speed at 2,500 RPM for approximately 90 seconds.
  4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
  5. Perform the A/F CONTROL operation with the engine idle (press the right or left button).

    Result: 

    A/F sensor reacts in synchronizing with increase and decrease of injection volume 

    +25 % --> rich output: Less than 3.0 V 

    -12.5 % --> lean output: More than 3.35 V 

    Heated oxygen sensor reacts in synchronizing with increase and decrease of injection volume 

    +25 % --> rich output: More than 0.55 V 

    -12.5 % --> lean output: Less than 0.4 V 

NOTE: However, there is a few second delay in the A/F sensor output. And there is about 20 seconds delay in the heated oxygen sensor.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.