The engine control module (ECM) learns the airflow through the throttle body to ensure the correct idle. The learned airflow values are stored within the ECM. These values are learned to adjust for production variation and will continuously learn during the life of the vehicle to compensate for reduced airflow due to throttle body coking. Anytime the throttle body airflow rate changes, for example due to cleaning or replacing, the values must be relearned.
An engine that had a heavily coked throttle body that has been cleaned or replaced may take several drive cycles to learn out the coking. To accelerate the process, the scan tool has the ability to reset all learned values back to zero. A new ECM will also have values set to zero.
The idle may be unstable or a DTC may set if the learned values do not match the actual airflow.
Note:
Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle.
Note:
During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.
Headlamp Aiming
Visual Aiming Preparation Procedure
Note: Some state and local laws specify requirements for headlamp
aim. Comply with all of these laws when performing any headlamp aiming operations.
Headlamp aim should be checked:
When a new headlamp capsule is installed.
If ser ...
Separating Parts
Note:
Disassembly of the piston, press fit design piston pin, and connecting
rod may create scoring or damage to the piston pin and piston pin bore.
If the piston, pin, and connecting rod have been disassembled, replace the
components as an assembly.
Many internal engine co ...
Transmission System Description and Operation
The F17 is a 5 speed manual transmission assembly.
Note: Use only transmission fluid listed within the
Adhesives, Fluids, Lubricants, and Sealers for
this manual transmission assembly. Other lubricants or additives may affect
the shift performance.
The F17 (Gen 1) 5 Speed m ...