The diagnostic trouble codes (DTCs) P1513 and P1514 are
generic codes that indicate an issue with the engine's air intake system. However, the specific meaning of these codes varies depending on the vehicle's make, model, and year. They can be related to the Idle Air Control (IAC) valve, Intake Manifold Runner Control (IMRC) system, or the Electronic Throttle Control (ETC). P1513: Intake Manifold Runner Control (IMRC) Bank 2 Stuck Closed (Example)
- What it means: For vehicles like a 1997 Hyundai, this code points to an IMRC system problem. It means the IMRC valve on the second bank of the engine is stuck in the closed position, restricting airflow. The IMRC system adjusts the length of the air intake runners to optimize performance and efficiency at different engine speeds.
- Common symptoms:
- Rough or poor idle
- Hesitation or a lack of power during acceleration
- Illuminated Check Engine Light
- Possible causes:
- Faulty IMRC actuator
- Heavy carbon buildup on the valves
- Damaged or leaking vacuum lines
- A faulty solenoid or actuator arm
P1514: Throttle Actuator Control or Throttle Body Performance Problem (Example)
- What it means: For many vehicles, particularly those with electronic throttle control (ETC) systems, this code signals an issue where the actual airflow doesn't match the expected airflow for a given throttle position. The Powertrain Control Module (PCM) detects an inconsistency between the Throttle Position Sensor (TPS) and other airflow readings.
- Common symptoms:
- Poor or rough idle
- Engine hesitates or stalls
- Reduced engine power or "limp mode"
- Illuminated Check Engine Light
- Possible causes:
- Dirty or contaminated throttle body
- Faulty Throttle Position Sensor (TPS)
- A problem with the electronic throttle control (ETC) motor
- Faulty wiring or a bad connector
- An intake air leak
Common repairs for these codes
- Check for carbon buildup: Use a quality throttle body or intake cleaner to remove carbon deposits from the throttle body and IMRC runners. For IMRC issues, this can often resolve a "stuck" valve.
- Inspect wiring and connectors: Examine the wiring harness and electrical connectors for the IMRC actuator, throttle body, and TPS. Look for loose, damaged, or corroded terminals.
- Check for vacuum leaks: Inspect all vacuum lines and hoses connected to the intake manifold for cracks, breaks, or loose connections. An unmetered air leak can confuse the engine's computer and trigger these codes.
- Replace faulty components: If cleaning and inspections don't resolve the issue, you may need to replace a faulty IMRC actuator, throttle body, or TPS, depending on the specific cause.
Recommended diagnostic steps
- Use an OBD-II scanner: Use a scan tool to not only read the codes but also view live data. Monitor the TPS reading, Mass Air Flow (MAF) sensor reading, and commanded vs. actual idle speed. This can help pinpoint if the problem is electrical or mechanical.
- Perform a visual inspection: Check all related components, wiring, and vacuum hoses for visible damage.
- Test component function: Use the scan tool's bi-directional controls, if available, to test the functionality of the IMRC actuator and ETC motor. You can also manually inspect the IMRC runners for freedom of movement.
- Clear codes and re-test: After making a repair, clear the codes with the scan tool and drive the vehicle to see if the problem and the codes return.
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