Code 44, Non-Heated O2 Sens CKT, Lean Exhaust INDC'T (VIN 6): Notes

ECM supplies approximately .45 volt between ECM terminals D6 and D7. If voltage is measured with a 10-megohm DVOM, reading may be as low as .32 volt. Oxygen (O2) sensor produces a varying voltage to ECM as engine reaches normal operating temperature. Voltage varies between .1 (lean) and 1.0 (rich) volt depending on conditions of exhaust gases in exhaust manifold.

O2 sensor will not produce voltage until sensor reaches 600°F (316°C). When sensor is less than specified, open loop condition exists.

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

Code 44 will set under the following conditions:
- No Code 21 or Code 33.
- Engine running for 50 seconds or more.
- Oxygen (O2) sensor voltage is less than .280 mV for 99 seconds.
- System is operating in closed loop.
- Engine coolant temperature is greater than 155°F (69.5°C).
- Throttle Position (TP) sensor is greater than 3 percent.
- Short term fuel trim is not at 128.
- Vehicle Speed Sensor (VSS) is greater than 3 MPH.