P080

DTC P080:

Sensor Circuit:

CIRCUIT DESCRIPTION:
This diagnostic test checks to see if initial TP Sensor/Learn and Idle Learn values have been stored in the PCM. If these values have not been stored, Code P080 is set. Performing the TP Sensor/Idle Learn Procedure on the next page will cause Code P080 to become history.

TEST CONDITION(S):
None.

FAILURE CONDITION(S):
No TP Sensor/Learn Value is stored.
OR
No Idle Learn Value is stored.

ACTION TAKEN:
PCM turns "ON" the "SERVICE ENGINE SOON" MIL

NOTES ON FAULT TREE:
If Code P080 does not change to history following the completion of the TP Sensor/Idle Learn Procedure, this may be due to incorrect or erratic signals from the following sensors:

^ Throttle Position Switch
^ TP Sensor
^ Vehicle Speed Sensor
^ Transaxle Range Switch (Park/Neutral Input)
^ Power Steering Pressure Switch
^ Brake Switch

High electrical loads may disable TP Sensor/Idle Learn. Components that may produce a high electrical load are the headlamps, the rear defogger, high HVAC blower and the cooling fans. If difficulty is encountered learning TP Sensor/Idle values (i.e. Code P080 remains current), turn "OFF" these high electrical loads. Also, it is important to accelerate the engine above 1000 RPM after turning "OFF" the above components because the PCM will think it is still under a high electrical load until it checks the system again (when engine RPM exceeds 1000 RPM). Furthermore, since the cooling fans can not be manually controlled, engine coolant temperature must be below 105°C and A/C refrigerant temperature must be below 51°C.

Code P080 may also remain current if the idle is rough or unstable. Correct problems with these sensors signals or the idle before attempting to perform the TP Sensor/Idle Learn.