Sub Heated Oxygen Sensor Testing
OXYGEN SENSOR INSPECTION1. INSPECT OPERATION OF SUB HEATED OXYGEN SENSOR.
(a) Check and then cancel any existing diagnostic trouble codes.
(b) Allow the engine to warm up to normal operating temperature.
(c) Drive for 5 minutes or more between 80 km/h (50 mph) and 1 00 km/h, (62 mph) in 4th or 5th gear/D range.
(d) Following the conditions in step (c), fully depress the accelerator pedal for 2 seconds or more.
HINT: Do not exceed 100km/h (62 mph), or diagnostic trouble code will be cancelled.
(e) Stop the vehicle, and turn the ignition switch to OFF.
(f) Carry out steps (b), (c) and (d) again to test acceleration.
^ If code No. 27 appears again, check the oxygen sensor circuit.
^ If the circuit is normal. replace the oxygen sensor.
2. INSPECT HEATER RESISTANCE OF SUB HEATED OXYGEN SENSOR.
(a) Remove the driver's seat.
(b) Take out the console box side of the floor carpet.
(c) Disconnect the oxygen sensor connector.
(d) Using an ohmmeter, measure the resistance between the terminals +B and HT.
Resistance at 20°C (68°F): 11 - 16 Ohms
^ If the resistance is not as specified, replace the sensor.
(e) Reconnect the oxygen sensor connector.
(f) Reinstall the floor carpet.
(g) Reinstall the driver's seat.