Code 44 (1.6L DOHC Turbo) - O2 Sensor Lean Fuel Mixture (Heated Sensor): 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 voltage from approximately .1 volt (lean exhaust) to 1.0 volt (rich exhaust). 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 or cold sensor will cause an open loop condition.

NOTE: Test numbers refer to test numbers on diagnostic chart.

Code 44 will set under following conditions:
- Coolant temperature is greater than 158°F (70°C).
- Integrator count is not at 128.
- No Code 21 or 33 is set.
- Oxygen sensor voltage is fixed below .05 volt.
- System is in closed loop.
- TPS is greater than 3.5 percent and less than 13.3 percent at less than 3000 RPM.