Confirmation Engine Racing Pattern

FI7132

(a) Connect the TOYOTA hand-held tester to the DLC3, or connect the probe of the oscilloscope between terminals OX1, OX2 and E1 of ECM.

(b) Start engine and warm it up with all accessories switched OFF until engine coolant temperature is stable.

(c) Race the engine at 2,500 - 3,000 rpm for about 3 minutes.

(d) After confirming that the waveform of the oxygen sensor, bank 1 sensor 1 (OX1), oscillate around 0.5 V during feedback to the ECM, check the waveform of the heated oxygen sensor, bank 1 sensor 2

HINT:

If there is a malfunction in the system, the waveform of the heated oxygen sensor, bank 1 sensor 2 (OX2), is almost the same as that of the oxygen sensor, bank 1 sensor 1 (OX1), on the left.

There are some cases where, even though a malfunction exists, the MIL may either light up or not light up.

Sensor Wave Form Corolla
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