4-80 FI SYSTEM DIAGNOSIS
Step 3
HO2 sensor heater check
1) Measure the resistance between terminals.
NOTE:
* Temperature of the HO2 sensor affects resistance value
largely.
* Make sure that the HO2 sensor heater is in atmospheric tem-
perature.
09900-25008: Multi circuit tester set
Tester knob indication: Resistance (
)
HO2 sensor heater resistance:
6.7 – 9.5
at 23 °C (73 °F) (W – W)
Is check result OK?
YES
Replace the ECM with a known good one, and
inspect it again.
NO
Replace the HO2 sensor with a new one.
(
4-93)
3