2010 Cadillac CTS Sedan AWD V6-3.6L Page 1850
DTC P0638, P2100, P2101, or P2119 (Without LF1)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0638
- Throttle Actuator Control (TAC) Command Performance
DTC P2100
- Throttle Actuator Control (TAC) Motor Control Circuit
DTC P2101
- Throttle Actuator Position Performance
DTC P2119
- Throttle Closed Position Performance
Diagnostic Fault Information
Circuit/System Description
The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control
(TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position sensors 1 and
2 to determine the actual throttle valve position.
Conditions for Running the DTCs
P0638 and P2101
* The ignition is ON or the engine is operating.
* The ignition voltage is greater than 7 V.
* Throttle position adaptation is not active.
* DTCs P0638 and P2101 run continuously once the above conditions are met for greater than 5 s.
P2100
* Before the ECM can report DTC P2100 failed, DTC P2101 must run and pass.
* The ignition is ON or the engine is operating.
* DTC P2100 runs continuously once the above conditions are met.
P2119
* DTC P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0700, P2122, P2123, P2127, P2128, or P2138 is not set.
* The ignition is ON.
* The vehicle speed is 0 km/h (0 mph).
* The engine speed is less than 40 RPM.
* The engine coolant temperature (ECT) is 5-100掳C (41-212掳F).
* The intake air temperature (IAT) is 5-143掳C (41-290掳F).
* The ignition voltage is greater than 10 V.
* The accelerator pedal position (APP) is less than 15 percent.
* DTC P2119 runs once per ignition cycle when the above conditions are met for less than 1 second.
Conditions for Setting the DTC
P0638
* The ECM detects that the commanded duty cycle for the range test high is greater than 80 percent.
OR
* The ECM detects that the commanded duty cycle for the range test low is greater than 80 percent.
* Either condition exists for greater than 1 second, or a cumulative of 10 s.
