DTC P1519 Throttle Actuator Control (TAC) Module Internal Circuit. Cadillac Catera 1999

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 1999 🢒 Catera 🢒 DTC 🢒 DTC P1519 Throttle Actuator Control (TAC) Module Internal Circuit

Circuit Description

The ECM controls the throttle blade by applying varying voltage to the throttle valve motor. The ECM monitors the pulse width modulation that is required to move the throttle blade. If an incorrect amount of pulse width modulation is required to operate the throttle valve motor a DTC will set.

Conditions for Running the DTC

•	The electronic throttle control (ETC) learn procedure is not active.

•	The duty cycle range switch is more than 80 percent.

Conditions for Setting the DTC

The ECM determines that an open or a short to ground is present in the throttle blade motor circuit (other DTCs will set) or an internal circuit fault was detected.

Action Taken When the DTC Sets

The ECM illuminates the malfunction indicator lamp (MIL) and records the operating conditions in the Freeze Frame on the first drive trip that the diagnostic runs and fails.

Conditions for Clearing the MIL/DTC

•	The ECM turns off the MIL after three consecutive drive trips that the diagnostic runs and passes.

•	A History DTC clears after forty consecutive warm-up cycles in which there is no failure reported by this diagnostic or any other emission related diagnostic.

•	The ECM battery voltage is interrupted.

•	The scan tool clears the MIL/DTC.

Step

Action

Values

Yes

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Diagnose and repair any other electronic throttle DTCs before proceeding.

Are any other DTCs displayed?

Go to applicable DTC

Go to Step 3

Important:

•	Perform the Idle Learn Procedure when replacing the ECM.

•	This vehicle is equipped with a theft deterrent system that interfaces with the engine control module (ECM). Program the new ECM with the frequency code of the theft deterrent module that is currently on the vehicle.

Replace the ECM. Refer to Engine Control Module Replacement/Programming .

Is the action complete?

Go to Step 4

Use a scan tool in order to clear the DTCs.
Start the engine.
Allow the engine to idle until the engine reaches the normal operating temperature.
Select the DTC and the Specific DTC function.
Enter the DTC number that was set.
Operate the engine within the Conditions for Running this DTC until the scan tool indicates the diagnostic Ran.

Does the scan tool indicate the diagnostic Passed?

Go to Step 5

Go to Step 2

Does the scan tool display any additional, undiagnosed DTCs?

Go to the applicable DTC table

System OK