E013

Diagnostic Chart.:

PCM Wiring:

DESCRIPTION:

The PCM/ECM provides a .45 volt reference to the oxygen sensor on CKT 412. When warm, a properly operating oxygen sensor will generate a counter voltage that will vary based on the amount of oxygen in the exhaust. The right 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 can't respond under the test conditions and generate a voltage greater or less then the .45 reference, it will set a code E013.
Possible causes of code E013 are:

1. Open in CKT 412 or 413.
2. Short to voltage on CKT 412 or 413.
3. Oxygen sensor that cannot respond.

TEST CONDITIONS:

1. Codes E014, E015, E021, E022, E026, E027 clear.
2. Coolant temperature 58° or greater.
3. TPS value between 6 and 30 degrees.
4. Throttle switch open.
5. Engine speed 800 RPM or greater.

FAILURE CONDITIONS:

Oxygen sensor voltage stays between .307 volts and .609 volts for more than 64 seconds (oxygen sensor voltage not toggling).

ACTION TAKEN:

1. PCM/ECM turns on "SERVICE ENGINE SOON" telltale.
2. Closed Loop is disabled.

NOTES ON FAULT TREE:

1. A voltage of .42 to .48 displayed is a reference from the PCM/ECM. The oxygen sensor must generate a .15 volts greater than the .45 reference to register an oxygen sensor cross count in the PCM/ECM.

2. The PCM/ECM compares voltage on CKT 412 to the ground on CKT 413. It is essential that the oxygen sensor ground and PCM/ECM ground on pin E15 are at the same voltage potential with the engine running.

NOTE ON INTERMITTENTS:

If code E013 is a history code, start engine, enter diagnostics. Operate engine at fast idle until "Auto" closed loop status light is turned on. Observe parameter ED33 while manipulating CKT's 412 and 413 wiring. If parameter ED33 changes from fluctuating to fixed at about .45 volts, repair intermittent open circuit. Check CKT 413 ground to engine for proper installation (clean, tight, star washer installed). Ground for CKT 413 is attached to the front of the engine at the right or rear most cylinder head.