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Engine-Codes – Honda – P1790 1998 Honda Civic

P1790 1998 Honda Civic Code - Throttle Position Sensor Circuit Malfunction

Quick Answer

The P1790 diagnostic trouble code (DTC) for a 1998 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 1998 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 1998 Honda Civic Description

The P1790 diagnostic trouble code (DTC) for a 1998 Honda Civic indicates a Throttle Position Sensor (TPS) Circuit Malfunction. The TPS is a crucial component of the vehicle's fuel management 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 determine the appropriate fuel delivery and ignition timing for optimal engine performance.

OBDII Code P1790 1998 Honda Civic - Throttle Position Sensor Circuit Malfunction
P1790 1998 Honda Civic Code - Throttle Position Sensor Circuit Malfunction

Common Causes of P1790 1998 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 Engine Control Module (ECM)
  5. Improper TPS adjustment

Symptoms of P1790 1998 Honda Civic

  1. Hesitation or surging during acceleration
  2. Rough idling or stalling
  3. Poor fuel efficiency
  4. Check Engine Light illuminated
  5. Reduced engine performance

How to Fix P1790 1998 Honda Civic

  1. Begin by conducting a thorough diagnosis using a scan tool to confirm the P1790 code and pinpoint the exact cause of the malfunction.
  2. Inspect the TPS wiring and connectors for any damage, corrosion, or contamination. Repair or replace as necessary.
  3. Test the TPS sensor using a multimeter to ensure it is functioning correctly. Replace the TPS if it is faulty.
  4. Clear the DTC and reset the ECM to erase the code and relearn the TPS position.
  5. Test drive the vehicle to ensure the issue has been resolved and monitor for any recurring symptoms.

Cost to Fix P1790 1998 Honda Civic

The typical repair costs for addressing a Throttle Position Sensor Circuit Malfunction can vary depending on the specific cause of the issue and the cost of parts and labor. In general, replacing a faulty TPS can range from $50 to $200, while addressing wiring or connector issues may add to the total cost. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates can vary based on location, vehicle make and model, and engine type. It is advisable to check with local repair shops for a more accurate estimate based on your specific circumstances.

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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 1998 Honda Civic Code

1. What are the common symptoms of OBDII code P1790 in a 1998 Honda Civic?

- Common symptoms include erratic engine idling, stalling, poor acceleration, and potential difficulty shifting gears.

2. What does the OBDII code P1790 indicate in a 1998 Honda Civic?

- OBDII code P1790 indicates a Throttle Position Sensor Circuit Malfunction in the vehicle's engine control system.

3. What are the possible causes of OBDII code P1790 in a 1998 Honda Civic?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors in the circuit, or issues with the engine control module.

4. How can I diagnose the Throttle Position Sensor Circuit Malfunction in my 1998 Honda Civic?

- You can diagnose the issue by using an OBDII scanner to retrieve the specific error code, inspecting the throttle position sensor and its wiring for damage, and testing the sensor's voltage output.

5. Can I drive my 1998 Honda Civic with OBDII code P1790?

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

6. Is it possible to repair OBDII code P1790 in a 1998 Honda Civic myself?

- Repairing OBDII code P1790 may require technical knowledge and experience. It's recommended to consult a professional mechanic for proper diagnosis and repair.

7. How much does it typically cost to fix OBDII code P1790 in a 1998 Honda Civic?

- The cost to fix OBDII code P1790 can vary depending on the extent of the issue and whether you choose to replace the throttle position sensor yourself or have a mechanic do the repair. Costs can range from $100 to $300 or more.

8. Can resetting the check engine light resolve OBDII code P1790 in a 1998 Honda Civic?

- Resetting the check engine light may temporarily turn it off, but it will not fix the underlying issue causing OBDII code P1790. It's important to address the root cause of the problem.

9. Will OBDII code P1790 cause my 1998 Honda Civic to fail an emissions test?

- Yes, OBDII code P1790 can cause your vehicle to fail an emissions test due to its impact on engine performance and emissions output.

10. How long can I safely drive my 1998 Honda Civic with OBDII code P1790 before getting it repaired?

- It is best to address OBDII code P1790 as soon as possible to prevent further damage to your vehicle and ensure optimal engine performance. Driving with this code for an extended period is not recommended.

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