P017

DTC P017:

Oxygen Sensor Circuit:

CIRCUIT DESCRIPTION:
The PCM provides a 0.45 volt reference to the oxygen sensor on CKT 412. When the Oxygen Sensor reaches operating temperature it will generate a counter voltage that will vary based on the amount of oxygen in the exhaust. The front heated oxygen sensor is located in the manifold before the catalytic convertor. A lean exhaust will generate a low voltage and cause the .45 reference to move lower. A rich exhaust will generate a high voltage and cause the .45 reference to move higher. If the oxygen sensor cannot respond under the test conditions and generate a voltage greater than 0.609 volt or less than 0.307 volt, it will set a Code P017. Possible causes of Code P017 are:

1. Open in CKT 412 or 413.
2. Short to voltage on CKT 412 or 413.
3. Oxygen Sensor that malfunctions.

TEST CONDITION(S):
1. Codes P014, P015, P021, P022, P026, and P027 not set.
2. Coolant temperature 81.5°C or greater.
3. Throttle between 5.4 and 25 degrees.
4. Throttle position switch open.
5. RPM 800 or greater.

FAILURE CONDITION(S):
Oxygen Sensor voltage stays between 0.307 volt and 0.609 volt for more than 64 seconds (oxygen sensor voltage not toggling).

ACTION TAKEN:
1. PCM turns "ON" the "SERVICE ENGINE SOON" MIL.
2. PCM enables evaporative emission control solenoid if Code P013 is also set.
3. Closed loop operation disabled.

NOTES ON FAULT TREE:
1. Voltage on PCM data parameter PD32 should fluctuate above 0.6 volt and below 0.3 volt. If voltage remains above 0.6 volt, check CKT 412 for a short to voltage. If voltage remains below 0.3 volt, check CKT 412 for a short to ground.
2. Measuring voltage with a voltmeter will isolate a sensor/wiring problem from a PCM problem. If voltage fluctuates above 0.6 volt and below 0.3 volt, the fault is with the PCM. If voltage remains below 0.3 volt, check CKT 412 for a short to ground or CKT 413 for a short to voltage. If voltage remains above 0.6 volt, check CKT 412 for a short to voltage. If voltage remains between 0.3 volt and 0.6 volt, check CKT 412 and CKT 413 for an open.