Code 1516
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Code 1516
I'm getting code 1516 a few days after installing LT headers and a F.A.S.T intake. the code is said to be TAC related. I clear the code, but it returns. Is there anything I can do to fix this short of buying a new TAC Module?
Thanks,
SC5
Thanks,
SC5
Melting Slicks
Joined: Jun 2004
Posts: 3,446
Likes: 661
From: panama city beach florida USA
St. Jude Donor '09
clearing codes doesnt fix them. get a good scan tool and compare tps readings . my guess when ya r+r thro. body to new intake. check for some thing interferring with plate,gasket did ya crank the bolts down with 1/2 in. drive and warp body
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Originally Posted by patton
clearing codes doesnt fix them. get a good scan tool and compare tps readings . my guess when ya r+r thro. body to new intake. check for some thing interferring with plate,gasket did ya crank the bolts down with 1/2 in. drive and warp body
I got my fingers crossed. I disconnected the battery last night and hooked it back up today and so far no CHK ENG light came on. So maybe it was the electronic gremlins.
Thread Starter
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Originally Posted by patton
okay my bad just keep clearin codes that will do it. unreal
Again thank you for your motivation
SC5
Safety Car
Joined: May 2006
Posts: 4,288
Likes: 129
From: Providence Forge, VA
St. Jude Donor '08-'09-'10-'11-'12
Circuit Description
The commanded throttle position, based on accelerator pedal position and possibly other limiting factors, is compared to the Actual throttle position. The 2 values should be within a calibrated range of each other. Both the PCM and the TAC module redundantly monitor the Commanded and Actual throttle position. This DTC sets if the TAC module detects the problem.
Conditions for Running the DTC
DTC P1518 is not set.
The ignition switch is in the crank or run position.
The ignition voltage is greater than 5.23 volts.
Not in battery saver mode.
Conditions for Setting the DTC
The TAC module detects that the commanded and actual throttle positions are not within a calibrated range of each other or the PCM and the TAC cannot determine throttle position or both TP sensors are invalid.
All of the above conditions met for less than 1 second.
Action Taken When the DTC Sets
The PCM will illuminate the Malfunction Indicator Light (MIL) when this diagnostic runs and fails.
The Reduced Engine Power message displays on the driver's information center.
The PCM records the operating conditions at the time during which the diagnostic fails. The PCM stores this information in the Freeze Frame and/or Failure Records.
If no other TAC System DTCs are set, the TAC System will operate in Reduced Engine Power mode. If certain TAC System DTCs are set at the same time, the TAC System either defaults to a more tightly restricted mode of operation if the TAC determines that limited safe operation is possible, or the TAC commands the engine to shut down.
Conditions for Clearing the MIL/DTC
The PCM turns OFF the MIL after three consecutive drive trips during which the diagnostic runs and does not fail.
A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.
A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
Use a scan tool in order to clear the MIL/DTC information.
Diagnostic Aids
Important :
Remove any debris from the PCM/TAC module connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM/TAC modules.
For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter kit J 35616-A. Using this kit prevents damage to the harness/component terminals.
The following problems may cause an intermittent:
Poor connections
Corrosion.
A mis-routed harness.
A rubbed-through wire insulation.
A broken wire inside of the insulation.
Inspect the TAC module connectors for signs of water intrusion. When this occurs, multiple DTCs should be set and no circuit or component problems can be located.
Ensure that the starting and charging systems are operating properly. Low system voltage causes this DTC to set.
When the TAC module detects a problem within the TAC System, more than one TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual problem may correct more than one DTC. Keep this in mind when reviewing captured DTC info.
For an intermittent condition, refer to Symptoms. See: Diagnosis By Symptom (Computers and Control Systems)
Test Description
The numbers below refer to the step numbers on the diagnostic table.
If the TP Indicated Angle does not follow the movement of the throttle blade, and no TP Sensor DTCs are set, there is a mechanical condition with the throttle shaft or the TP Sensor. Re-install the air inlet duct after you complete the repairs.
When a condition is detected within the TAC System, more than one TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. It is possible that locating and repairing one individual condition may correct more than one DTC. keep this in mind when reviewing captured DTC info.
Copyright © 2006 ALLDATA LLC
The commanded throttle position, based on accelerator pedal position and possibly other limiting factors, is compared to the Actual throttle position. The 2 values should be within a calibrated range of each other. Both the PCM and the TAC module redundantly monitor the Commanded and Actual throttle position. This DTC sets if the TAC module detects the problem.
Conditions for Running the DTC
DTC P1518 is not set.
The ignition switch is in the crank or run position.
The ignition voltage is greater than 5.23 volts.
Not in battery saver mode.
Conditions for Setting the DTC
The TAC module detects that the commanded and actual throttle positions are not within a calibrated range of each other or the PCM and the TAC cannot determine throttle position or both TP sensors are invalid.
All of the above conditions met for less than 1 second.
Action Taken When the DTC Sets
The PCM will illuminate the Malfunction Indicator Light (MIL) when this diagnostic runs and fails.
The Reduced Engine Power message displays on the driver's information center.
The PCM records the operating conditions at the time during which the diagnostic fails. The PCM stores this information in the Freeze Frame and/or Failure Records.
If no other TAC System DTCs are set, the TAC System will operate in Reduced Engine Power mode. If certain TAC System DTCs are set at the same time, the TAC System either defaults to a more tightly restricted mode of operation if the TAC determines that limited safe operation is possible, or the TAC commands the engine to shut down.
Conditions for Clearing the MIL/DTC
The PCM turns OFF the MIL after three consecutive drive trips during which the diagnostic runs and does not fail.
A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.
A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
Use a scan tool in order to clear the MIL/DTC information.
Diagnostic Aids
Important :
Remove any debris from the PCM/TAC module connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM/TAC modules.
For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter kit J 35616-A. Using this kit prevents damage to the harness/component terminals.
The following problems may cause an intermittent:
Poor connections
Corrosion.
A mis-routed harness.
A rubbed-through wire insulation.
A broken wire inside of the insulation.
Inspect the TAC module connectors for signs of water intrusion. When this occurs, multiple DTCs should be set and no circuit or component problems can be located.
Ensure that the starting and charging systems are operating properly. Low system voltage causes this DTC to set.
When the TAC module detects a problem within the TAC System, more than one TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual problem may correct more than one DTC. Keep this in mind when reviewing captured DTC info.
For an intermittent condition, refer to Symptoms. See: Diagnosis By Symptom (Computers and Control Systems)
Test Description
The numbers below refer to the step numbers on the diagnostic table.
If the TP Indicated Angle does not follow the movement of the throttle blade, and no TP Sensor DTCs are set, there is a mechanical condition with the throttle shaft or the TP Sensor. Re-install the air inlet duct after you complete the repairs.
When a condition is detected within the TAC System, more than one TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. It is possible that locating and repairing one individual condition may correct more than one DTC. keep this in mind when reviewing captured DTC info.
Copyright © 2006 ALLDATA LLC
