AutoCodes – Lincoln – P1520 Lincoln

P1520 Lincoln Code - Intake Manifold Runner Control Circuit Fault

Quick Answer

The Intake Manifold Runner Control (IMRC) is an electrically actuated system consisting of a motorized actuator with an attaching linkage for each housing on each bank. Common causes include Faulty Intake Manifold Runner Control (IMRC) actuator, Intake Manifold Runner Control actuator harness is open or shorted, Intake Manifold Runner Control actuator 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: P1520 Lincoln indicates Intake Manifold Runner Control Circuit Fault.
Common causes: Common causes include Faulty Intake Manifold Runner Control (IMRC) actuator, Intake Manifold Runner Control actuator harness is open or shorted, Intake Manifold Runner Control actuator 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 1,613

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 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1520 Lincoln Description

The Intake Manifold Runner Control (IMRC) is an electrically actuated system consisting of a motorized actuator with an attaching linkage for each housing on each bank. The linkage attaches to the housing butterfly plate levers. Each IMRC housing is an aluminum casting with two intake air passages for each cylinder. One passage is always open, and the other is opened and closed with a butterfly valve plate. The housing uses a return spring to hold the plates closed. The motorized actuator houses internal switches to provide feedback to the Powertrain Control Module (PCM), indicating linkage and plate position. Under about 3000 rpm, the vacuum solenoid will be energized. This will allow the manifold vacuum to be applied and the butterfly valve plates to stay closed. Above approximately 3000 rpm, the vacuum solenoid will be de-energized. This will allow a vacuum to vent from the actuator and the butterfly valve plates to open. The Diagnostic Trouble Code (DTC) sets when the signal is outside an expected calibrated range.

OBDII Code P1520 Lincoln - Intake Manifold Runner Control Circuit Fault - AutoCodes.com — P1520 Lincoln Code - Intake Manifold Runner Control Circuit Fault

What does this mean?

What are the Possible Causes of the DTC P1520 Lincoln?

Faulty Intake Manifold Runner Control (IMRC) actuator
Intake Manifold Runner Control actuator harness is open or shorted
Intake Manifold Runner Control actuator circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1520 Lincoln?

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 P1520 Lincoln 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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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.

Frequently Asked Questions about P1520 Lincoln Code

What does the OBDII code P1520 mean on a Lincoln?

P1520 indicates an Intake Manifold Runner Control (IMRC) Circuit Fault, meaning the system that adjusts airflow in the intake manifold is not functioning properly.

What are the common symptoms of P1520 on a Lincoln?

Symptoms may include reduced engine performance, poor fuel efficiency, rough idling, and the Check Engine Light turning on.

What causes the P1520 code on a Lincoln?

Common causes include a faulty IMRC actuator, damaged wiring or connectors, or a malfunctioning intake manifold control solenoid.

Can I drive my Lincoln with the P1520 code?

While you can drive with this code, performance and fuel efficiency may be affected. Prolonged driving without repairs could lead to additional engine issues.

How can I diagnose the P1520 code on a Lincoln?

Start by inspecting the IMRC actuator, wiring, and connectors for damage or wear. Use a multimeter to check for circuit continuity and ensure proper voltage is reaching the actuator.

How do I fix the P1520 code on a Lincoln?

Repairs may include replacing the IMRC actuator, repairing or replacing damaged wiring, or cleaning the intake manifold runners if they’re stuck.

How much does it cost to repair a P1520 code on a Lincoln?

Repair costs vary but typically range between $150 and $500 depending on whether the actuator, wiring, or other components need replacement.

What tools are needed to fix the P1520 code on a Lincoln?

Basic tools include a multimeter for electrical testing, a diagnostic scanner to clear the code, and potentially wrenches and screwdrivers to replace the actuator.

Can a dirty intake manifold cause the P1520 code on a Lincoln?

Yes, carbon buildup can cause the intake manifold runners to stick, leading to the IMRC circuit fault. Cleaning the intake manifold may resolve the issue.

Will clearing the P1520 code fix the issue permanently?

No, clearing the code will temporarily remove the Check Engine Light, but the underlying issue needs to be repaired to prevent the code from returning.