AutoCodes – Toyota – P1656 2002 Toyota Echo

P1656 2002 Toyota Echo Code - Oil Control Valve Circuit Malfunction

Quick Answer

Variable Valve Timing (VVT) system controls the intake valve timing to proper timing in response to driving condition. Common causes include Faulty Oil Control Valve (OCV), Oil Control Valve (OCV) harness is open or shorted, Oil Control Valve (OCV) circuit poor electrical connection. 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: P1656 2002 Toyota Echo indicates Oil Control Valve Circuit Malfunction.
Common causes: Common causes include Faulty Oil Control Valve (OCV), Oil Control Valve (OCV) harness is open or shorted, Oil Control Valve (OCV) circuit poor electrical connection.
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.

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Code Popularity 8,969

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 06, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1656 2002 Toyota Echo Description

Variable Valve Timing (VVT) system controls the intake valve timing to proper timing in response to driving condition. The Engine Control Module (ECM) controls Oil Control Valve (OCV) to make the intake valve timing properly, and, oil pressure controlled with OCV is supplied to the VVT controller, and then, VVT controller changes relative position between the camshaft and the crankshaft.

OBDII Code P1656 2002 Toyota Echo - Oil Control Valve Circuit Malfunction - AutoCodes.com — P1656 2002 Toyota Echo Code - Oil Control Valve Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1656 2002 Toyota Echo?

Faulty Oil Control Valve (OCV)
Oil Control Valve (OCV) harness is open or shorted
Oil Control Valve (OCV) circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1656 2002 Toyota Echo?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1656 2002 Toyota Echo code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1656 2002 Toyota Echo code?

Need more information on how to fix the P1656 2002 Toyota Echo code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P1656 2002 Toyota Echo Code

1. What are the common symptoms of OBDII code P1656 on a 2002 Toyota Echo?

- The common symptoms include rough idling, engine misfires, a decrease in fuel efficiency, and illuminated Check Engine Light.

2. What is the most common cause of OBDII code P1656 on a 2002 Toyota Echo?

- The most common cause is a malfunctioning oil control valve, which regulates the flow of oil to the variable valve timing system.

3. How can I diagnose the issue related to OBDII code P1656 on a 2002 Toyota Echo?

- A diagnostic scan tool can be used to retrieve the specific code, followed by a visual inspection of the oil control valve and its wiring for any signs of damage or wear.

4. Can a faulty oil control valve be repaired, or does it need to be replaced?

- In most cases, a faulty oil control valve needs to be replaced with a new one to ensure proper functioning of the variable valve timing system.

5. Are there any preventive maintenance tips to avoid OBDII code P1656 on a 2002 Toyota Echo?

- Regular oil changes and using high-quality engine oil can help prevent issues with the oil control valve and reduce the likelihood of triggering this code.

6. How much does it typically cost to replace the oil control valve on a 2002 Toyota Echo?

- The cost of replacing the oil control valve can vary depending on the labor rates and the price of the part, but it usually ranges from $150 to $300.

7. Can driving with OBDII code P1656 on a 2002 Toyota Echo cause further damage to the engine?

- Continuing to drive with this code may result in poor engine performance and potential damage to the variable valve timing system, so it is recommended to address the issue promptly.

8. Is it safe to reset the Check Engine Light after fixing the issue related to OBDII code P1656 on a 2002 Toyota Echo?

- Yes, it is safe to reset the Check Engine Light using a diagnostic scan tool after resolving the underlying problem with the oil control valve circuit.

9. Can a DIY enthusiast with basic automotive skills replace the oil control valve on a 2002 Toyota Echo?

- While it is possible for a DIY enthusiast to replace the oil control valve, it is recommended to consult a professional mechanic for accurate diagnosis and proper installation.

10. Are there any recalls or technical service bulletins related to OBDII code P1656 on a 2002 Toyota Echo?

- It is advisable to check with the nearest Toyota dealership or visit the National Highway Traffic Safety Administration (NHTSA) website for any relevant recalls or technical service bulletins regarding this issue.