AutoCodes – Toyota – P1315 Toyota

P1315 Toyota Code - Igniter Circuit Malfunction No. 4

Quick Answer

Direct Ignition System (DIS) is a 1-cylinder ignition system that ignites one cylinder with one ignition coil. Common causes include Faulty Ignition Coil No, 4, Ignition Coil No. 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: P1315 Toyota indicates Igniter Circuit Malfunction No. 4.
Common causes: Common causes include Faulty Ignition Coil No, 4, Ignition Coil No.
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 114,468

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 17, 2020

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P1315 Toyota Description

Direct Ignition System (DIS) is a 1-cylinder ignition system that ignites one cylinder with one ignition coil. Ignitor is integral to ignition coil. The Engine Control Module (ECM) determines ignition timing and outputs a ignition signal (IGT) for each cylinder. Based on the IGT signals, power transistors in the ignitor cut of current to primary coil in ignition coil, causing ignition coil to fire spark plug. After delivering a command to turn off primary circuit on the IGT wire, ECM monitors IGF circuit to ensure primary switching occurred.

OBDII Code P1315 Toyota - Igniter Circuit Malfunction No. 4 - AutoCodes.com — P1315 Toyota Code - Igniter Circuit Malfunction No. 4

What does this mean?

What are the Possible Causes of the DTC P1315 Toyota?

Faulty Ignition Coil No. 4
Ignition Coil No. 4 harness is open or shorted
Ignition Coil No. 4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1315 Toyota?

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 does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1315 Toyota 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.

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Information for Specific Toyota Models

P1315 2000 Toyota Echo — Igniter Circuit Malfunction No. 4
P1315 2001 Toyota Echo — Igniter Circuit Malfunction No. 4
P1315 2002 Toyota Echo — Igniter Circuit Malfunction No. 4

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 P1315 Toyota Code

1. What does the OBDII code P1315 mean on a Toyota?

The P1315 code in a Toyota indicates an issue with the "Igniter Circuit Malfunction No. 4," suggesting a problem with the ignition system for cylinder 4, primarily related to electrical components such as the igniter, wiring, or coil.

2. What are the common symptoms of code P1315 in a Toyota?

Common symptoms include engine misfires, rough idling, reduced engine performance, increased fuel consumption, and the Check Engine Light turning on.

3. What can cause the P1315 code to appear on a Toyota?

Possible causes include faulty ignition coil or igniter, damaged or corroded wiring and connectors in the ignition circuit, or issues with the engine control module (ECM).

4. How do I diagnose the problem when I get a P1315 code on my Toyota?

Diagnosis should begin with a visual inspection of the ignition coil and associated wiring for any signs of damage or wear. Use a multimeter to check for proper voltage and resistance in the ignition circuit. It's also advisable to check the condition of the spark plug itself.

5. Is it safe to drive a Toyota with the P1315 code?

While you can technically still drive, it is not recommended as it can lead to further engine damage and potentially unsafe driving conditions due to engine misfires and loss of power.

6. What repairs can resolve the error code P1315 on a Toyota?

Repairs may involve replacing the faulty ignition coil or igniter, repairing or replacing damaged wires or connectors in the ignition circuit, or in some cases, replacing the engine control module.

7. How much does it typically cost to fix a P1315 code in a Toyota?

The cost can vary widely depending on the specific repair needed. Replacing an ignition coil can range from $150 to $350, while more complex electrical repairs or replacing the ECM can be significantly more expensive.

8. Can a faulty spark plug cause the P1315 code on a Toyota?

Yes, a faulty spark plug can indirectly cause the P1315 code by stressing the ignition system, though the code specifically relates to the igniter circuit. Itâ€™s important to check the condition of the spark plugs when diagnosing this code.

9. What tools are needed to diagnose and repair a P1315 code on a Toyota?

Essential tools include a multimeter for electrical testing, a code reader or scanner to diagnose and clear codes, and basic hand tools to access and replace components in the ignition system.

10. Can ignoring a P1315 code lead to other problems in a Toyota?

Yes, ignoring this code can lead to more severe engine issues, such as engine knocking, increased emissions, and potentially the engine failing to start or stopping unexpectedly while driving.