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Engine-Codes – Honda – P1790 1999 Honda Civic

P1790 1999 Honda Civic Code - Throttle Position Sensor Circuit Malfunction

Quick Answer

The P1790 diagnostic trouble code (DTC) for a 1999 Honda Civic indicates a Throttle Position Sensor (TPS) Circuit Malfunction. Common causes include Worn-out or damaged throttle position sensor, Corrosion or poor electrical connections in the TPS circuit, Faulty wiring or connectors leading to the TPS. 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 1999 Honda Civic indicates Throttle Position Sensor Circuit Malfunction.
Common causes
Common causes include Worn-out or damaged throttle position sensor, Corrosion or poor electrical connections in the TPS circuit, Faulty wiring or connectors leading to the TPS.
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 1999 Honda Civic Description

The P1790 diagnostic trouble code (DTC) for a 1999 Honda Civic indicates a Throttle Position Sensor (TPS) Circuit Malfunction. The TPS is a crucial component of the vehicle's electronic fuel injection system, responsible for monitoring the position of the throttle valve and sending this information to the engine control module (ECM). The ECM uses this data to adjust the air-fuel mixture for optimal engine performance and efficiency. When the TPS circuit malfunctions, it can lead to a range of issues affecting the vehicle's drivability and overall performance.

OBDII Code P1790 1999 Honda Civic - Throttle Position Sensor Circuit Malfunction
P1790 1999 Honda Civic Code - Throttle Position Sensor Circuit Malfunction

Common Causes of P1790 1999 Honda Civic

  1. Worn-out or damaged throttle position sensor.
  2. Corrosion or poor electrical connections in the TPS circuit.
  3. Faulty wiring or connectors leading to the TPS.
  4. Issues with the throttle body assembly.
  5. ECM software or hardware issues affecting TPS communication.

Symptoms of P1790 1999 Honda Civic

  1. Rough idling or stalling when the vehicle is at a stop.
  2. Hesitation or lack of response when accelerating.
  3. Poor fuel efficiency and decreased engine performance.
  4. Engine misfires or surging while driving.
  5. Illumination of the Check Engine Light on the dashboard.

How to Fix P1790 1999 Honda Civic

  1. Begin by diagnosing the TPS circuit using a scan tool to confirm the P1790 code.
  2. Inspect the TPS sensor for any physical damage or wear and tear.
  3. Check the wiring and connectors for corrosion, breaks, or loose connections.
  4. Test the TPS voltage output using a multimeter to ensure it is within the manufacturer's specifications.
  5. If necessary, replace the TPS sensor and recalibrate it to the correct throttle position.

Cost to Fix P1790 1999 Honda Civic

The cost of repairing a Throttle Position Sensor Circuit Malfunction can vary depending on the extent of the issue and the specific components that need to be replaced. On average, the cost of replacing a TPS sensor ranges from $100 to $200, including parts and labor. Additional costs may apply if other components such as wiring or connectors need to be replaced. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle model.

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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 1999 Honda Civic Code

1. What are the common symptoms of OBDII code P1790 in a 1999 Honda Civic?

The common symptoms of code P1790, Throttle Position Sensor Circuit Malfunction, in a 1999 Honda Civic include poor acceleration, rough idling, stalling, and the Check Engine light illuminating.

2. What usually causes the OBDII code P1790 in a 1999 Honda Civic?

The most common causes of code P1790 in a 1999 Honda Civic are a faulty throttle position sensor, damaged wiring or connectors in the throttle position sensor circuit, or a problem with the ECM (Engine Control Module).

3. How can I diagnose the Throttle Position Sensor Circuit Malfunction in my 1999 Honda Civic?

To diagnose code P1790 in your 1999 Honda Civic, you can use an OBDII scanner to read the trouble code, visually inspect the throttle position sensor and its wiring, and perform voltage tests on the sensor.

4. Can I drive my 1999 Honda Civic with OBDII code P1790?

It is not recommended to drive your 1999 Honda Civic with code P1790 as it can cause further damage to the engine and affect the car's performance. It is best to address the issue promptly.

5. How do I repair OBDII code P1790 in my 1999 Honda Civic?

To repair code P1790 in your 1999 Honda Civic, you may need to replace the throttle position sensor, repair or replace damaged wiring or connectors, or reprogram the ECM if necessary.

6. Will resetting the Check Engine light fix OBDII code P1790 in my 1999 Honda Civic?

Resetting the Check Engine light may temporarily turn it off, but it will not fix the underlying issue causing code P1790 in your 1999 Honda Civic. It is important to diagnose and repair the problem to prevent further issues.

7. How much does it typically cost to repair OBDII code P1790 in a 1999 Honda Civic?

The cost of repairing code P1790 in a 1999 Honda Civic can vary depending on the exact cause of the issue. On average, it can cost anywhere from $100 to $300 for parts and labor.

8. Can a DIY enthusiast fix OBDII code P1790 in a 1999 Honda Civic?

If you have the necessary tools, knowledge, and experience, a DIY enthusiast may be able to fix code P1790 in a 1999 Honda Civic by replacing the throttle position sensor or repairing damaged wiring. However, it is recommended to consult a professional if unsure.

9. Is it common for the Throttle Position Sensor Circuit Malfunction to recur in a 1999 Honda Civic?

If the underlying issue causing code P1790 is not properly addressed, it is possible for the Throttle Position Sensor Circuit Malfunction to recur in a 1999 Honda Civic. Ensure that the root cause is resolved to prevent future occurrences.

10. Can a malfunctioning throttle position sensor affect the fuel efficiency of a 1999 Honda Civic?

Yes, a malfunctioning throttle position sensor, as indicated by OBDII code P1790, can negatively impact the fuel efficiency of a 1999 Honda Civic by causing improper air-fuel mixture and engine performance. Addressing the issue promptly can help improve fuel efficiency.

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