P1516

DTC P1516: Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Wiring Diagram:

Circuit Description
The predicted throttle position is compared to the actual throttle position. The 2 values should be within a calibrated range of each other. The Engine Control Module (ECM) redundantly monitors the predicted and the actual throttle position. This DTC sets if the ECM detects an out of range condition between the predicted and the actual throttle position.

Conditions for Setting the DTC
- Engine is running
- The ECM detects that the desired and actual throttle positions are not within a calibrated range of each other.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the The numbers below refer to the step numbers on the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- The DTC(s) can be cleared by using the scan tool.
- Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids
- Inspect the TAC connectors for signs of water intrusion. When water intrusion occurs, multiple DTCs could be set with no DTC circuit or component conditions found during diagnostic testing.
- Ensure that the starting and charging systems are operating properly. Low system voltage can cause this DTC to set.
- When the ECM detects a condition within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests that run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Keep this in mind when reviewing the Stored Capture Info.
- For an intermittent, refer to Intermittents Intermittents.

Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
1. If the TP Indicated angle does not follow the movement of the throttle plate and no TP Sensor DTCs are set, there is a mechanical condition with the throttle shaft or the TP sensor.
2. When the ECM detects a condition within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests that run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Keep this in mind when reviewing the Capture Info.

Step 1-6:

Step 7-17:

Troubleshooting