OXYGEN SENSOR
OXYGEN SENSOR INSPECTION
1. INSPECT HEATER RESISTANCE OF OXYGEN
SENSOR
Using an ohmmeter, measure the resistance between
the terminals +B and HT.
Resistance: 5.1.–6.3 at 20C (68F)
If the resistance is not as specified, replace the
oxygen sensor.
2. INSPECTION OF FEEDBACK VOLTAGE (VF1)
(a) Warm up the engine.
(b) Connect the voltmeter to the DLC1 terminals VF, and
E1.
HINT: Use SST when connecting between terminals
TE1 and E1 of the DLC1.
SST 09843–18020
Warm up the oxygen sensor with the engine at 2,500
rpm for approx. 94 seconds. And maintain engine
speed at 2,500 rpm.
Disconnect terminals TE1 and E1 of the DLC
1. And maintain engine speed 2,500pm.
Connect terminals TE1 and E1 of the DLC1. And
maintain engine speed at 2, 500 rpm.
Warm p the oxygen sensor with the engine at 2,500
rpm for approx. 90 seconds.
Check the number of times the voltometer needle
fluctuates in 10 seconds.
Check the number of times the voltmeter needle fluctuates in 10 seconds.
CONTINUED ON PAGE
EG1–213
After replacing
the oxygen
sensor
Less than 6 times
Replace the ECM.
Less than 6 times
6 times o more
6 times
or more
NormaI
Zero
Zero
–ENGINE MFI SYSTEM
EG1–212
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