The engine control module (ECM) is the control center for the throttle actuator control (TAC) system. The ECM determines the driver's intent based on input from the accelerator pedal position sensors, then calculates the appropriate throttle response based on the throttle position sensors. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the throttle actuator motor. The throttle blade is spring loaded in both directions, and the default position is slightly open.
Normal Mode
During the operation of the TAC system, several modes, or functions, are considered normal. The following modes may be entered during normal operations:
Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
Secondary Air Injection Pump Air Cleaner Pipe Replacement
Secondary Air Injection Pump Air Cleaner Pipe Replacement
Callout
Component Name
1
Hose Retainer (QTY:2)
Note: Squeeze the retainer on opposite sides to release.
2
Secondary A ...
Inspection/Maintenance (I/M) System DTC Table (LUW)
Inspection/Maintenance (I/M) System DTC Table
System
DTCs Required to Set System Status to YES
If an inspection/maintenance system status indicator did NOT update to
YES during the Inspection/Maintenance System Check,
review ea ...
Throttle Body Heater Outlet Hose Replacement (LUW)
Throttle Body Heater Outlet Hose Replacement
Callout
Component Name
Preliminary Procedure
Drain the cooling system. Refer to
Cooling System Draining and Filling.
Remove the air cleaner outlet duct. Refer to
Air Cle ...