Oxygen Sensor (Main)
INSPECTION OF OXYGEN SENSOR
1. WARM UP ENGINE
Allow the engine to warm up to normal operating tempera-
ture.
2. INSPECT FEEDBACK VOLTAGE
Connect the positive (+) probe of a voltmeter to terminal VF1
of the check connector, and negative (–) probe to terminal
E1. Perform the test as follows:
Warm up the oxygen sensor with the engine at 2,500
rpm for approx. 90 seconds.
Connect terminals TE1 and E1 of the check connector.
And maintain engine speed at 2,500 rpm.
Check the number of times the voltmeter needle fluctuates in 10 seconds.
Warm up the oxygen sensor with the engine at 2,500
rpm for approx. 90 seconds. And maintain engine at
2,500 rpm.
Check the number of times the voltmeter needle
fluctuates in 10 seconds.
Disconnect terminals TE1 and E1 of the check connector.
And maintain engine speed at 2,500 rpm.
Measure voltage between terminals VF1 and E1.
Read and record diagnostic codes. (See page TR–9 or TR–10)
Repair the relevant diagnostic code.
CONTINUED ON PAGE FI–55
Malfunction code(s)
(Ex. code Nos. 21, 25 and 26)
Normal code, code Nos.
21, 25 and 26
More than 0 V
Zero
8 times or more
Zero
8 times
or more
Less than 8 times
Normal
Replace the ECU.
After replacing
the oxygen sensor
Zero again
0 V
More than 0 V
Less than 8 times
FI–54
–EFI SYSTEM Electronic Control System (Oxygen Sensor (Main))
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