P1574 – OBD-II DTC

OBD-II DTC P1574 – Speed Control Output Circuit Continuity

DTC P1574 meaning

DTC P1574 refers to a diagnostic trouble code indicating a problem with the speed control output circuit continuity. This code is typically associated with vehicles equipped with electronic throttle control systems. It suggests that there is an issue in the circuit that controls the speed of the vehicle, which can affect the cruise control functionality.

DTC P1574 symptoms

Common symptoms associated with DTC P1574 may include:

• Inoperative cruise control system
• Illumination of the check engine light
• Erratic engine speed
• Loss of throttle response

DTC P1574 causes

Several factors can lead to the triggering of DTC P1574, including:

• Faulty speed control module
• Wiring issues such as shorts or open circuits
• Corroded or damaged connectors
• Faulty throttle position sensor
• Malfunctioning engine control module (ECM)

DTC P1574 seriousness

DTC P1574 can be considered serious as it affects the vehicle’s cruise control system, which can lead to unsafe driving conditions. If the speed control output circuit is compromised, it may result in unintended acceleration or deceleration, posing a risk to the driver and others on the road. It is advisable to address this issue promptly.

How to diagnose DTC P1574

To diagnose DTC P1574, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P1574 code.
2. Inspect the vehicle’s wiring and connectors related to the speed control system for any visible damage or corrosion.
3. Check the throttle position sensor for proper operation.
4. Test the speed control module for functionality.
5. Perform a continuity test on the speed control output circuit.
6. Clear the code and take the vehicle for a test drive to see if the code reappears.

How to fix DTC P1574 step-by-step instructions

To fix DTC P1574, follow these steps:

1. Inspect and repair any damaged wiring or connectors related to the speed control circuit.
2. Replace any faulty components, such as the throttle position sensor or speed control module.
3. Ensure all connections are secure and free from corrosion.
4. Recheck the continuity of the speed control output circuit after repairs.
5. Clear the DTC using an OBD-II scanner.
6. Test drive the vehicle to ensure the issue is resolved and the code does not return.

How to erase DTC P1574

To erase DTC P1574, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Access the trouble codes menu on the scanner.
4. Select the option to clear or erase codes.
5. Confirm the action and wait for the scanner to indicate that the codes have been cleared.
6. Disconnect the scanner and start the vehicle to ensure the check engine light is off.

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