P085

Code P085:

Throttle Body Carbon Deposits:

DESCRIPTION
The Powertrain Control Module (PCM) continuously learns base idle position. This base idle position is the relationship of engine RPM to throttle position. The PCM is limited to a fixed amount of learned throttle angle that it can apply. When this limit is reached, Code P085 will set. The cause of this increase in learned throttle angle is usually deposits in the throttle body.

TEST CONDITIONS
Test continuously.

FAILURE CONDITIONS
1. Air Conditioning (A/C) "OFF," learned idle throttle angle 5 degrees or greater.
OR
2. A/C "ON," learned idle throttle angle 5 degrees or greater.

ACTION TAKEN
PCM turns "ON" the "Service Engine Soon" Malfunction Indicator Lamp (MIL).

NOTES ON FAULT TREE
1. If engine stalls, continue the test. The stall may be caused by the carbon deposits on the throttle valves and in the throttle bores.