4 Runner 2WD L4-144.4 2366cc 2.4L SOHC (22R-E) (1990)
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Fig. 69 Oxygen sensor diagnosis chart
1.
Run engine until it reaches normal operating temperature, then connect voltmeter to EFI service connector as shown in Fig 9.
2.
Run engine at 2500 RPM for 2 minutes to warm oxygen sensor.
3.
Follow diagnostic chart, Fig. 69, and repair system as necessary.
