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Engine-Codes – Honda – P1790 1997 Honda Civic

P1790 1997 Honda Civic Code - Throttle Position Sensor Circuit Malfunction

Quick Answer

The P1790 diagnostic trouble code (DTC) for a 1997 Honda Civic indicates a Throttle Position Sensor (TPS) Circuit Malfunction. Common causes include Faulty Throttle Position Sensor, Damaged or corroded wiring/connectors, Poor electrical connections. 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 1997 Honda Civic indicates Throttle Position Sensor Circuit Malfunction.
Common causes
Common causes include Faulty Throttle Position Sensor, Damaged or corroded wiring/connectors, Poor electrical connections.
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 13, 2024
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Code P1790 1997 Honda Civic Description

The P1790 diagnostic trouble code (DTC) for a 1997 Honda Civic indicates a Throttle Position Sensor (TPS) Circuit Malfunction. The TPS is a crucial component of the vehicle's fuel injection system, as it monitors the position of the throttle valve and sends signals to the engine control unit (ECU) to adjust the air-fuel mixture for optimal performance. When the TPS circuit malfunctions, it can lead to a variety of issues that affect the vehicle's performance, fuel efficiency, and emissions.

OBDII Code P1790 1997 Honda Civic - Throttle Position Sensor Circuit Malfunction
P1790 1997 Honda Civic Code - Throttle Position Sensor Circuit Malfunction

Common Causes of P1790 1997 Honda Civic

  1. Faulty Throttle Position Sensor
  2. Damaged or corroded wiring/connectors
  3. Poor electrical connections
  4. Malfunctioning Engine Control Unit (ECU)
  5. Environmental factors such as moisture or heat affecting the sensor

Symptoms of P1790 1997 Honda Civic

  1. Rough idling or stalling
  2. Hesitation or surging during acceleration
  3. Decreased fuel efficiency
  4. Check Engine Light illuminated
  5. Difficulty starting the vehicle

How to Fix P1790 1997 Honda Civic

  1. Diagnose the issue by using a scan tool to retrieve the trouble code and test the TPS circuit for proper voltage and resistance.
  2. Inspect the TPS sensor, wiring, and connectors for any signs of damage or corrosion.
  3. Replace the Throttle Position Sensor if it is found to be faulty.
  4. Repair or replace any damaged wiring or connectors.
  5. Clear the trouble code and reset the ECU to ensure the issue is resolved.

Cost to Fix P1790 1997 Honda Civic

The cost of repairing a Throttle Position Sensor Circuit Malfunction on a 1997 Honda Civic can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing a Throttle Position Sensor ranges from $100 to $200, including parts and labor. However, additional costs may apply if there are other underlying issues that need to be addressed. It's recommended to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your vehicle's specific needs. Keep in mind that labor rates can vary between different repair facilities, so it's advisable to shop around for the best price.

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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 1997 Honda Civic Code

1. What are the common symptoms of OBDII code P1790 in a 1997 Honda Civic?

- Common symptoms include erratic idle speed, stalling, poor acceleration, and potential issues with the vehicle's transmission shifting.

2. What causes the Throttle Position Sensor Circuit Malfunction in a 1997 Honda Civic?

- The P1790 code is often triggered by a faulty throttle position sensor, damaged wiring or connectors in the sensor circuit, or issues with the sensor's calibration.

3. How can I diagnose the Throttle Position Sensor Circuit Malfunction in my 1997 Honda Civic?

- Diagnosing the issue involves using an OBDII scanner to retrieve the trouble code, checking the throttle position sensor's voltage readings, and inspecting the sensor's wiring and connections for any damage.

4. Can I drive my 1997 Honda Civic with the P1790 code present?

- It is not recommended to drive the vehicle with the P1790 code active, as it can lead to poor engine performance and potential safety hazards on the road. It's best to address the issue promptly.

5. What are the repair options for fixing the Throttle Position Sensor Circuit Malfunction in a 1997 Honda Civic?

- Repair options include replacing the throttle position sensor, repairing damaged wiring or connectors, and resetting the sensor's calibration using a professional diagnostic tool.

6. Is it possible to reset the P1790 code in a 1997 Honda Civic without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, it is not recommended to do so without addressing the root cause, as the problem may persist and lead to further issues down the line.

7. How much does it typically cost to repair the Throttle Position Sensor Circuit Malfunction in a 1997 Honda Civic?

- The cost of repair can vary depending on the extent of the issue and whether you choose to do the repair yourself or take the vehicle to a mechanic. Generally, replacing the throttle position sensor can cost around $100 to $200.

8. Are there any preventative measures I can take to avoid the P1790 code in my 1997 Honda Civic?

- Regular maintenance, such as keeping the throttle position sensor clean and checking the sensor's wiring for any signs of wear, can help prevent issues that may trigger the P1790 code.

9. Will the P1790 code cause my 1997 Honda Civic to fail an emissions test?

- Yes, the P1790 code can cause your vehicle to fail an emissions test due to the impact it has on engine performance and emissions control systems.

10. How long does it typically take to repair the Throttle Position Sensor Circuit Malfunction in a 1997 Honda Civic?

- The repair process can take anywhere from 1 to 3 hours, depending on the extent of the issue, your experience with automotive repairs, and the availability of necessary parts and tools.

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