P1516 and P0101 codes

Hi and thanks for using 2CarPros.com. This is a complicated one. However, we are going to try something simple first. Here is a description of the 1516 code and what causes it. And yes, it should be in a reduced power situation.

CIRCUIT DESCRIPTION
The predicted throttle position (TP), based on accelerator pedal position (APP) and other limiting factors, is compared to the actual throttle position. The two values should be within a calibrated range of each other. Both the powertrain control module (PCM) and the throttle actuator control (TAC) module redundantly monitor the predicted and actual throttle position. This DTC sets if the PCM detects an out of range condition between the predicted and actual throttle position.

CONDITIONS FOR SETTING THE DTC
The TAC module detects that the predicted and the actual throttle positions are not within a calibrated range of each other.
The PCM and the TAC cannot determine the throttle position.
Both of the TP sensors are invalid.
All of the above conditions are met for more than 1 second .
ACTION TAKEN WHEN THE DTC SETS
The PCM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Freeze Frame and/or the Failure Records.
The PCM commands the TAC system to operate in the Reduced Engine Power mode.
OR

Under certain conditions the PCM commands the engine OFF.
The message center displays Reduced Engine Power.
CONDITIONS FOR CLEARING THE MIL/DTC
The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.

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Okay, since the 101 deals with the mass air flow sensor, I want to start there first. I want you to follow these directions and clean the MAF sensor.

https://www.2carpros.com/articles/mass-air-flow-service

Once this process is completed, make sure all connections to it are clean and tight. Also, inspect the throttle plate on the throttle body for any corrosion or deposits.

After you do this, clear the code and drive the vehicle to see if the light comes back on. If it does, then let me know which codes are present at that time.

Let me know if you have other questions.

Take care,
Joe

Pat. I am happy to help. This is a tough one since it is not following standard prototype, lol. Just confirm the same codes are there and try one more time to clear them with the scanner. Let me know what you find. I hate to say it, but in 2003 there were issues with the throttle body on many of these vehicles which mandated a full replacement to correct the problem. I am starting to question if it is related.

Regardless, I wish you luck and let me know how it turns out for you.

Joe

I have seen where servicing the throttle actuator helps this problem a bunch. Here is a video of the same problem but different car:

https://youtu.be/jBQWElA-3Zk

and

https://www.2carpros.com/articles/throttle-actuator-service

Please run down these guides and report back.

Cheers, Ken

Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers, Ken