Code 44, Oxygen Sensor Circuit Lean Exhaust Indicated VIN 6): Notes

The ECM supplies a voltage of approximately .43 volt between ECM terminals D6 and D7 (if measurement is taken with a 10-megohm DVOM, reading may be as low as .32 volt). The O2 sensor varies the voltage within a range of about one volt if exhaust is rich and down to about .10 volt if exhaust is lean. When sensor temperature is less than 600°F (316°C), the sensor acts like an open circuit and will not produce voltage. An open sensor circuit causes an open loop condition.

1. Code 44 sets when Codes 21 or 33 are not present, engine has been running for 50 seconds or more, O2 sensor signal voltage is less than .278 mV for 99 seconds, system is in closed loop, coolant temperature is more than 158°F (70°C), TPS is more than 3 percent and integrator count is not at 128.