With California Emissions

Heated Oxygen Sensor Circuit:

Engine Control Module Connector--For Pin Applications See Components:

NOTE: Perform all tests before replacing the sensor.

FRONT SENSOR OUTPUT VOLTAGE TEST
1. Connect scan tool to the Data Link Connector, and run engine in park or neutral, until cooling fan cycles at least once (engine warm).
2. Run engine up to 4,000 rpm and decelerate suddenly, the measured sensor voltage should drop to approximately 0.200 Volts.
3. Suddenly increase engine speed to approximately 3,000 rpm, the output voltage of the measured sensor should rise to approximately 0.6 to 1.0 Volts.
4. Run engine at idle for 2 minutes, the output voltage of the sensor should change up and down between 0.4 volts or less and 0.6 to 1.0 Volts.
5. Run engine at 2,000 rpm for a half minute, the output voltage of the sensor should change up and down between 0.4 volts or less and 0.6 to 1.0 Volts.

REAR SENSOR OUTPUT VOLTAGE TEST
1. Connect scan tool to the Data Link Connector, and drive vehicle with transaxle in low range, at 3,500 rpm.
2. The output voltage of the measured sensor should stay between 0.6 and 1.0 Volts.


SENSOR HEATER TEST (FRONT OR REAR)
1. Connect scan tool to the Data Link Connector, and run engine in park or neutral, until cooling fan cycles at least once (engine warm).
2. Run engine at idle (750 rpm) for 2 minutes, the heater should be on.
3. Run engine at 3,000 rpm for one half of a minute, the heater should turn OFF and stay off while at this speed..

Oxygen Sensor Testing:

HARNESS INSPECTION