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Engine-Codes – Honda – P1790 1996 Honda Civic

P1790 1996 Honda Civic Code - Throttle Position Sensor Circuit Malfunction

Quick Answer

The P1790 diagnostic trouble code (DTC) for a 1996 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 sensor. 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 1996 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 sensor.
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 17, 2024
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Code P1790 1996 Honda Civic Description

The P1790 diagnostic trouble code (DTC) for a 1996 Honda Civic indicates a Throttle Position Sensor (TPS) Circuit Malfunction. The TPS is a crucial component of the engine management system, as it monitors the position of the throttle valve and sends this information to the engine control unit (ECU). This data helps the ECU determine the appropriate air-fuel mixture for optimal engine performance. When the TPS circuit malfunctions, it can lead to a variety of issues that affect the vehicle's drivability and overall performance.

OBDII Code P1790 1996 Honda Civic - Throttle Position Sensor Circuit Malfunction
P1790 1996 Honda Civic Code - Throttle Position Sensor Circuit Malfunction

Common Causes of P1790 1996 Honda Civic

  1. Faulty Throttle Position Sensor.
  2. Damaged wiring or connectors in the TPS circuit.
  3. Corrosion or contamination in the TPS sensor.
  4. Issues with the ECU receiving TPS data.
  5. Environmental factors such as heat or moisture affecting the TPS.

Symptoms of P1790 1996 Honda Civic

  1. Poor acceleration or lack of response when pressing the gas pedal.
  2. Rough idling or stalling when coming to a stop.
  3. Hesitation or surging during acceleration.
  4. Engine misfires or backfiring.
  5. Reduced fuel efficiency.

How to Fix P1790 1996 Honda Civic

  1. Begin by diagnosing the issue using a scan tool to confirm the P1790 code and inspecting the TPS sensor and circuit for any visible damage.
  2. Replace the Throttle Position Sensor if it is found to be faulty, ensuring proper installation and calibration.
  3. Check and repair any damaged wiring or connectors in the TPS circuit.
  4. Clear the DTC from the ECU memory and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the ECU or other components.

Cost to Fix P1790 1996 Honda Civic

The typical repair costs for a Throttle Position Sensor Circuit Malfunction can vary depending on the extent of the damage and the specific components that need to be replaced. In general, replacing the TPS sensor itself can range from $50 to $200, while labor costs can add an additional $100 to $200. Overall, the total repair cost for addressing a P1790 code in a 1996 Honda Civic may range from $150 to $400. However, it is important to note that these estimates are approximate and actual costs may vary based on factors such as location, vehicle make and model, and labor rates at auto repair shops. It is recommended to obtain quotes from local shops 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 1996 Honda Civic Code

1. What does the OBDII code P1790 mean on a 1996 Honda Civic?

P1790 indicates a Throttle Position Sensor (TPS) Circuit Malfunction, meaning the ECU has detected an issue with the signal from the TPS.

2. What are the common symptoms of a P1790 code in a 1996 Honda Civic?

Symptoms may include erratic acceleration, poor engine performance, difficulty shifting (if automatic), and possibly an illuminated check engine light.

3. What causes the P1790 code to appear on a 1996 Honda Civic?

Common causes include a faulty throttle position sensor, damaged wiring or connectors, or an issue with the ECU interpreting the TPS signal.

4. How do I diagnose the P1790 code on my 1996 Honda Civic?

Start by inspecting the TPS and its wiring for damage, test the sensor with a multimeter, and check for proper voltage and continuity in the circuit.

5. Can I drive my 1996 Honda Civic with a P1790 code?

While the car may still be drivable, you should address the issue promptly to avoid further damage, poor performance, or unsafe driving conditions.

6. How do I fix the P1790 code on a 1996 Honda Civic?

Repairs may include replacing the throttle position sensor, repairing or replacing damaged wiring, or recalibrating the ECU if necessary.

7. How much does it cost to fix a P1790 code on a 1996 Honda Civic?

The cost can range from $50 to $200 for a new TPS, plus labor costs if you're not performing the repair yourself.

8. Can a dirty throttle body cause the P1790 code?

Yes, a dirty throttle body may cause inconsistent readings from the TPS, potentially triggering the P1790 code.

9. Will resetting the ECU clear the P1790 code permanently?

Resetting the ECU may temporarily clear the code, but the issue will return unless the underlying problem is resolved.

10. How can I prevent the P1790 code from recurring in my 1996 Honda Civic?

Regularly inspect and maintain the throttle body and TPS, and ensure wiring connections are secure and free from corrosion.

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