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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROL SYSTEM (SFI) - DIAGNOSTICS (2ZZ-GE))DTC P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)CONFIRMATION DRIVING PATTERN
2004 Toyota Matrix XR, FWD, Standard

Confirmation Driving Pattern

2004 Toyota Matrix XR, FWD, StandardSECTION Confirmation Driving Pattern
WARNING: This page is about a different variant/trim than selected.
Fig 1: Graphical Representation - Engine Speed/Time
G02915246Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Connect the hand held tester to the DLC3, or connect the tester probes of the oscilloscope between terminals OX1A, OX1B and E1 of the ECM connector.
  2. Start the engine and warm it up with all the accessories switched OFF until the engine coolant temperature becomes stable.
  3. Run the engine at 2,500 to 3,000 RPM for about 3 minutes.
  4. After confirming that the waveform of the bank 1 sensor 1 (OX1A) which oscillates between 0 V and 1 V under a feedback to the ECM, check the waveform of the bank 1 sensor 2 (OX2A).

HINT:

If there is malfunction in the system, the waveform of "sensor 2" (OX2A) may become a similar to the one of "sensor 1" (OX1A) as shown in the diagram on the left.

Fig 2: OX Signal Waveform (Oscilloscope)
G02915247Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
RENDER: 1.0x

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

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  • • 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.