AutoCodes – Generic – P1514

P1514 Code - Throttle Actuator Control System Mass Air Flow Performance

Quick Answer

The Throttle Actuator Control (TAC) system uses vehicle electronics and components to calculate and control the position of the throttle blade. Common causes include Faulty Throttle Actuator Control (TAC), Throttle Actuator Control (TAC) harness is open or shorted, Throttle Actuator Control (TAC) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1514 indicates Throttle Actuator Control System Mass Air Flow Performance.
Common causes: Common causes include Faulty Throttle Actuator Control (TAC), Throttle Actuator Control (TAC) harness is open or shorted, Throttle Actuator Control (TAC) circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 23,762

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 26, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1514 Description

The Throttle Actuator Control (TAC) system uses vehicle electronics and components to calculate and control the position of the throttle blade. This eliminates the need for a mechanical cable attachment from the accelerator pedal to the throttle body. This system also performs the cruise control functions as well.
The TAC system components include, but are not limited to the following:
- The accelerator pedal position (APP) sensors
- The throttle body
- The Powertrain Control Module (PCM)
Each of these components interface together to ensure accurate calculations and control of the throttle position (TP).
<b>Throttle Body Assembly</b>
The throttle body for the throttle actuator control (TAC) system is similar to a conventional throttle body with several exceptions. One exception being the use of a motor to control the throttle position instead of a mechanical cable. Another exception is the throttle position (TP) sensor. The TP sensor is mounted in the throttle body assembly. The TP sensor is 2 individual TP sensors within the throttle body assembly. Two separate signal, low reference, and 5-volt reference circuits are used to connect the TP sensors and the Powertrain Control Module (PCM). TP sensor 2 signal voltage increases as the throttle opens. TP sensor 1 signal voltage decreases as the throttle opens.

OBDII Code P1514 - Throttle Actuator Control System Mass Air Flow Performance - AutoCodes.com — P1514 Code - Throttle Actuator Control System Mass Air Flow Performance

What does this mean?

What are the Possible Causes of the DTC P1514?

Faulty Throttle Actuator Control (TAC)
Throttle Actuator Control (TAC) harness is open or shorted
Throttle Actuator Control (TAC) circuit poor electrical connection
Faulty Mass Air Flow (MAF) Sensor

How to Fix the DTC P1514?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1514 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

P1514 Acura — Throttle Position Sensor / Mass Air Flow Sensor Signal Variation
P1514 Audi — Intake Manifold Changeover Valve 2 Circuit Short to Ground
P1514 Buick — Throttle Actuator Control System Mass Air Flow Performance
P1514 Cadillac — Throttle Actuator Control System Mass Air Flow Performance
P1514 Chevrolet — Throttle Actuator Control System Mass Air Flow Performance
P1514 GMC — Throttle Actuator Control System Mass Air Flow Performance
P1514 Honda — Throttle Position Sensor / Mass Air Flow Sensor Signal Variation
P1514 Hyundai — Oil Temperature Sensor
P1514 Isuzu — Throttle Position Sensor / Mass Air Flow Sensor Signal Variation
P1514 Jaguar — Park / Neutral Position (PNP) Switch High Load Neutral / Drive
P1514 Land Rover — Idle Air Control Valve Opening Circuit
P1514 Subaru — Idle Air Control Solenoid Valve Signal 3 Circuit Low Input
P1514 Volkswagen — Intake Manifold Changeover Valve 2 Circuit Short to Ground

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.