HEATED OXYGEN SENSOR
HEATED OXYGEN SENSOR INSPECTION
1. INSPECT HEATER RESISTANCE OF HEATED
OXYGEN SENSOR
Using an ohmmeter, measure the resistance between
the terminals +B and HT.
Resistance:
California 2WD only
4.5 – 6.0 Ω at 23C (73F)
Others
5.1 – 6.3 Ω at 20C (68 F)
If the resistance is not as specified, replace the heated
oxygen sensor.
2. INSPECTION OF FEEDBACK VOLTAGE (VF1)
(a) Warm up the engine.
(b) Connect the voltmeter to the DLC1 terminals VF1 and
E1.
HINT: Use SST when connecting between terminals
TE1 and E1 of the DLC1.
SST 09843–18020
Warm up the heated oxygen sensor with the engine
at 2,500 rpm for approx. 90 seconds. And maintain
engine speed at 2,500 rpm.
Warm up the heated oxygen sensor with the engine
at 2,500 rpm for approx. 90 seconds.
Less than 8 times
CONTINUED ON PAGE EG2–253
Connect terminals TE1 and E1 of the DLC1.
And maintain engine speed at 2,500 rpm.
Check that the number of times the voltmeter
needle fluctuates in 10 seconds.
Check the number of times the voltmeter needle fluctuates in 10 seconds.
After replacing
the heated oxygen
sensor
Replace the ECM.
Less than 8 times
8 times or more
8 times or more
Normal
Zero
Zero
–ENGINE MFI SYSTEM
EG2–252
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