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P1790 2000 Honda Civic Code - Throttle Position Sensor Circuit Malfunction

Quick Answer

The P1790 diagnostic trouble code (DTC) for a 2000 Honda Civic indicates a Throttle Position Sensor (TPS) Circuit Malfunction. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or contamination in the TPS circuit. 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
P1790 2000 Honda Civic indicates Throttle Position Sensor Circuit Malfunction.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or contamination in the TPS circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 29, 2024
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Code P1790 2000 Honda Civic Description

The P1790 diagnostic trouble code (DTC) for a 2000 Honda Civic indicates a Throttle Position Sensor (TPS) Circuit Malfunction. The throttle position sensor is a crucial component of the vehicle's electronic fuel injection system, as it monitors the position of the throttle valve and sends this information to the engine control module (ECM). This data is used by the ECM to adjust the air-fuel mixture for optimal engine performance and fuel efficiency.

OBDII Code P1790 2000 Honda Civic - Throttle Position Sensor Circuit Malfunction
P1790 2000 Honda Civic Code - Throttle Position Sensor Circuit Malfunction

Common Causes of P1790 2000 Honda Civic

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Corrosion or contamination in the TPS circuit
  4. Malfunctioning ECM
  5. Poor electrical connections

Symptoms of P1790 2000 Honda Civic

  1. Rough idling or stalling
  2. Hesitation or surging during acceleration
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated
  5. Limp mode activation

How to Fix P1790 2000 Honda Civic

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific trouble code and data related to the TPS circuit.
  2. Inspect the throttle position sensor, wiring, and connectors for any visible damage or corrosion. Replace any damaged components.
  3. Test the TPS sensor using a multimeter to ensure it is sending accurate voltage signals to the ECM.
  4. Clear the trouble code from the ECM's memory and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause of the malfunction.

Cost to Fix P1790 2000 Honda Civic

The typical repair costs for a Throttle Position Sensor Circuit Malfunction on a 2000 Honda Civic can range from $100 to $300, including parts and labor. However, it is essential to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops often charge less. It is recommended to check local rates for a more accurate estimate.

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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 P1790 2000 Honda Civic Code

1. What are the common symptoms of OBDII code P1790 (Throttle Position Sensor Circuit Malfunction) in a 2000 Honda Civic?

- Common symptoms include poor acceleration, rough idling, stalling, and issues with shifting gears.

2. What are the possible causes of OBDII code P1790 in a 2000 Honda Civic?

- The code P1790 can be caused by a faulty throttle position sensor, wiring issues, or a malfunctioning engine control module (ECM).

3. How can I diagnose the Throttle Position Sensor Circuit Malfunction in my 2000 Honda Civic?

- Use an OBDII scanner to read the trouble codes, visually inspect the throttle position sensor and its connections, and perform voltage tests on the sensor.

4. Can I drive my 2000 Honda Civic with the P1790 code present?

- It is not recommended to drive with the P1790 code present, as it can lead to poor performance and potential safety hazards.

5. What is the typical repair process for fixing the Throttle Position Sensor Circuit Malfunction in a 2000 Honda Civic?

- The repair process usually involves replacing the faulty throttle position sensor, repairing any damaged wiring, or reprogramming the engine control module.

6. How much does it cost to repair the Throttle Position Sensor Circuit Malfunction in a 2000 Honda Civic?

- The cost of repair can vary depending on the exact cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

7. Can I reset the P1790 code in my 2000 Honda Civic without repairing the issue?

- While you can clear the code with an OBDII scanner, it is important to address the underlying problem to prevent further damage to the vehicle.

8. Are there any DIY tips for troubleshooting the Throttle Position Sensor Circuit Malfunction in a 2000 Honda Civic?

- You can start by checking the sensor's wiring harness for any visible damage or corrosion, and also ensure the sensor is securely connected.

9. Will a Throttle Position Sensor Circuit Malfunction affect the fuel efficiency of my 2000 Honda Civic?

- Yes, the P1790 code can lead to decreased fuel efficiency due to inaccurate throttle position readings affecting the engine's performance.

10. How long does it take to repair the Throttle Position Sensor Circuit Malfunction in a 2000 Honda Civic?

- The repair time can vary depending on the extent of the issue, but it typically takes between 1 to 2 hours for a professional mechanic to diagnose and fix the problem.

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