6-2-44 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
1. Reference waveform No.1
Heated oxygen sensor–2 heater signal at engine idling
2. Reference waveform No.2
Heated oxygen sensor–1 signal at engine idling
3. Reference waveform No.3
Heated oxygen sensor–1 heater signal at engine idling
Measurement
terminal
CH1: E22-33 to E23-1
CH2: E23-3 to E23-1
Oscilloscope
setting
CH1: 500 mV/DIV, CH2: 10 V/DIV
TIME: 200 ms/DIV
Measurement
condition
• After warmed up to normal operating
temperature
• Drive vehicle at 60 km/h (37 mil/h) for 10
min.
• Engine at specified idle speed
1. Heated oxygen sensor–2 signal
2. Heated oxygen sensor–2 heater signal
Measurement
terminal
CH1: E22-11 to E23-1
CH2: E23-4 to E23-1
Oscilloscope
setting
CH1: 500 mV/DIV, CH2: 20 V/DIV
TIME: 1 s/DIV
Measurement
condition
• After warmed up to normal operating
temperature
• Engine at specified idle speed
1. Heated oxygen sensor–1 signal
2. Heated oxygen sensor–1 heater signal
Measurement
terminal
CH1: E22-11 to E23-1
CH2: E23-4 to E23-1
Oscilloscope
setting
CH1: 500 mV/DIV, CH2: 10 V/DIV
TIME: 200 ms/DIV
Measurement
condition
• After warmed up to normal operating
temperature
• Engine at specified idle speed
1. Heated oxygen sensor–1 signal
2. Heated oxygen sensor–1 heater signal
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