SUB–OXYGEN SENSOR (CALIFORNIA
ONLY)
SUB–OXYGEN SENSOR INSPECTION
EG0HY–01
1. INSPECT SUB–OXYGEN SENSOR
HINT: Inspect only when code No.27 is displayed.
(a) Cancel the diagnostic trouble code. (See TR section)
(b) Warm up the engine until it reaches normal operating
temperature.
(c) (M/T)
Drive for 5 minutes or more at a speed less than 80 km/h (50
mph) in 4th or 5th gear.
(A/T)
Drive for 5 minutes or more at a speed less than 80 km/h (50
mph) in ”D” position.
(d) Following the conditions in step (c), fully depress on the
accelerator pedal for 2 seconds or more.
(e) Stop the vehicle and turn the ignition switch OFF.
(f) Carry out steps (b), (c) and (d) again to test acceleration.
If code No.27 appears again, check the sub–oxygen sensor
circuit. If the circuit is normal, replace the sub –oxygen sen-
sor.
2. INSPECT HEATER RESISTANCE OF SUB–OXYGEN
SENSOR
Using an ohmmeter, measure the resistance between termi-
nals +B and HT.
Resistance:
11.7–14.3 at 20°C (68°F)
If resistance is not as specified, replace the sub–oxygen sen-
sor.
EG–230
–ENGINE TROUBLESHOOTING SFI SYSTEM
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