AutoCodes – Ford – P1504 1997 Ford F150

P1504 1997 Ford F150 Code - Intake Air Control Circuit Malfunction

Quick Answer

The Idle Air Control Valve (IACV) valve assembly controls the engine idle speed and provides a dashpot function. Common causes include Faulty Idle Air Control Valve, Idle Air Control Valve harness is open or shorted, Idle Air Control Valve 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: P1504 1997 Ford F150 indicates Intake Air Control Circuit Malfunction.
Common causes: Common causes include Faulty Idle Air Control Valve, Idle Air Control Valve harness is open or shorted, Idle Air Control Valve 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 5,261

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 25, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1504 1997 Ford F150 Description

The Idle Air Control Valve (IACV) valve assembly controls the engine idle speed and provides a dashpot function. The IAC valve assembly meters intake air around the throttle plate through a bypass within the IAC valve assembly and throttle body. The Powertrain Control Module (PCM) determines the desired idle speed or bypass air and signals the IAC valve assembly through a specified duty cycle. The IAC valve responds by positioning the IAC valve to control the amount of bypassed air. The PCM monitors engine RPM and increases or decreases the IAC duty cycle in order to achieve the desired RPM.

OBDII Code P1504 1997 Ford F150 - Intake Air Control Circuit Malfunction - AutoCodes.com — P1504 1997 Ford F150 Code - Intake Air Control Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1504 1997 Ford F150?

Faulty Idle Air Control Valve
Idle Air Control Valve harness is open or shorted
Idle Air Control Valve circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1504 1997 Ford F150?

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 does this mean?

Code Tech Notes

The Idle Air Control solenoid resistance is from 6 to 13 ohms.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1504 1997 Ford F150 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 P1504 1997 Ford F150 Code

1. What are common symptoms of OBDII code P1504 on a 1997 Ford F150?

- Common symptoms include rough idling, stalling, and decreased engine performance.

2. What does the OBDII code P1504 indicate on a 1997 Ford F150?

- The code indicates an Intake Air Control Circuit Malfunction.

3. What are the possible causes of OBDII code P1504 on a 1997 Ford F150?

- Possible causes include a faulty Intake Air Control Valve, wiring issues, or a defective PCM.

4. How can I diagnose the Intake Air Control Circuit on a 1997 Ford F150 to resolve OBDII code P1504?

- Diagnose by checking the wiring connections, inspecting the Intake Air Control Valve for proper operation, and testing the PCM.

5. Can a dirty air filter cause OBDII code P1504 on a 1997 Ford F150?

- While a dirty air filter can affect engine performance, it is not a direct cause of the Intake Air Control Circuit Malfunction.

6. Is it safe to continue driving with OBDII code P1504 on a 1997 Ford F150?

- It is not recommended to drive with this code as it can lead to further engine issues and potential breakdowns.

7. How can I reset the OBDII code P1504 on a 1997 Ford F150 after making repairs?

- You can reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes.

8. Can a DIY enthusiast repair OBDII code P1504 on a 1997 Ford F150?

- Yes, if familiar with automotive repairs, one can attempt to diagnose and repair the Intake Air Control Circuit issue causing the code.

9. Will OBDII code P1504 cause a decrease in fuel efficiency on a 1997 Ford F150?

- Yes, the code can lead to a decrease in fuel efficiency due to improper air intake control affecting engine performance.

10. How much does it cost to repair OBDII code P1504 on a 1997 Ford F150 at a mechanic?

- The cost of repair can vary depending on the exact cause, but it may range from $100 to $300 including parts and labor.

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