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Engine Management – V6 – Diagnostics Page 6C1-2–178
19 1 Using Tech 2, clear the DTCs. 2 Switch off the ignition for 30 seconds. 3 Start the engine. 4 Operate the vehicle within the conditions for Does DTC P2097 or P2099 fail this ignition cycle? — Go to Step 2 Go to Step 20 20 Using Tech 2, select the DTC display function. Does Tech 2 display any DTCs? — Go to the appropriate DTC Table in this Section System OK When all diagnosis and repairs are completed, clear all DTCs and verify correct operation
7.48 DTC P2105 DTC Descriptor This diagnostic procedure supports DTC P2105 – Throttle Control Forced Engine Shutdown. Circuit Description The ECM monitors and evaluates the accelerator pedal position (APP) sensors signal voltage along with other sensor • At engine idle speed or when no current is flowing into the throttle actuator control (TAC) motor, a constant force • To control the throttle opening, the ECM applies PWM voltage to the TAC motor. The ECM increases this PWM To decrease the throttle opening from the seven percent rest position, the ECM reverses the polarity of the TAC motor The ECM monitors the ignition supply voltage to ensure the correct operation of the engine management components Conditions for Running the DTC DTC P2105 runs continuously when the ECM completed the power-down process in the last ignition cycle. Conditions for Setting the DTC The ECM detects an incorrect voltage level at the ignition supply circuits. Conditions for Clearing the DTC DTC P2105 – Throttle Actuator Control (TAC) Module Internal Circuit is a Type A DTC. Refer to 1.4 Diagnostic Trouble Additional Information • Refer to 6C1-1 Engine Management – V6 – General Information for details of the TP actuator operation. • Since fault condition in a wiring connector may trigger DTCs, always test the connectors related to this diagnostic • For an intermittent fault condition, refer to 5.2 Intermittent Fault Conditions in this Section. • To assist diagnosis, refer to 3 Wiring Diagrams and Connector Charts in this Section, for the system wiring diagram and connector charts. |