AutoCodes – Scion – C1312 Scion

C1312 Scion Code - Short In Main Relay 1 Circuit

Quick Answer

The Anti-Lock Brake System (ABS) main relay 1 (ABS No.1 relay) supplies power to the changeover solenoid and the linear solenoid. Common causes include Faulty Anti-Lock Brake System (ABS) Main Relay 1, ABS Main Relay 1 harness is open or shorted, ABS Main Relay 1 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: C1312 Scion indicates Short In Main Relay 1 Circuit.
Common causes: Common causes include Faulty Anti-Lock Brake System (ABS) Main Relay 1, ABS Main Relay 1 harness is open or shorted, ABS Main Relay 1 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 953

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, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1312 Scion Description

The Anti-Lock Brake System (ABS) main relay 1 (ABS No.1 relay) supplies power to the changeover solenoid and the linear solenoid. ABS main relay 2 (ABS No.2 relay) goes on for approximately 5 seconds after the ignition switch is turned off and the braking effort signal input is terminated. ABS main relay 2 (ABS No.2 relay) supplies electricity and maintains operating condition for the brake system when the ignition switch is off.

OBDII Code C1312 Scion - Short In Main Relay 1 Circuit - AutoCodes.com — C1312 Scion Code - Short In Main Relay 1 Circuit

What does this mean?

What are the Possible Causes of the DTC C1312 Scion?

Faulty Anti-Lock Brake System (ABS) Main Relay 1
ABS Main Relay 1 harness is open or shorted
ABS Main Relay 1 circuit poor electrical connection

How to Fix the DTC C1312 Scion?

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 C1312 Scion 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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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 C1312 Scion Code

1. What are common symptoms of OBDII code C1312 in a Scion related to a short in Main Relay 1 Circuit?

The common symptoms include difficulty starting the vehicle, intermittent engine stalling, and potential issues with the fuel pump operation.

2. What are the possible causes of OBDII code C1312 in a Scion indicating a short in Main Relay 1 Circuit?

Potential causes include a faulty main relay, damaged wiring or connectors in the main relay circuit, or a malfunctioning engine control module (ECM).

3. How can I diagnose the short in Main Relay 1 Circuit causing OBDII code C1312 in my Scion?

Diagnosing this issue typically involves checking the main relay, inspecting the wiring and connectors for any damage, and testing the ECM for proper functioning using a scan tool.

4. Can I drive my Scion with OBDII code C1312 present due to a short in Main Relay 1 Circuit?

It is not recommended to drive the vehicle with this issue as it can lead to further electrical problems or potential engine stalling while driving.

5. How can I repair a short in Main Relay 1 Circuit triggering OBDII code C1312 in my Scion?

Repairing this issue may involve replacing the main relay, repairing or replacing damaged wiring and connectors, or reprogramming the ECM if necessary.

6. Is it safe to reset the OBDII code C1312 related to a short in Main Relay 1 Circuit in my Scion using a diagnostic scanner?

While you can reset the code with a diagnostic scanner, it is important to address the underlying issue causing the code to prevent further problems in the vehicle.

7. Are there any preventive maintenance tips to avoid OBDII code C1312 in a Scion due to a short in Main Relay 1 Circuit?

Regularly inspecting the main relay, wiring, and connectors for any signs of wear or damage can help prevent the occurrence of this code.

8. Can a DIY enthusiast without advanced automotive knowledge fix OBDII code C1312 related to a short in Main Relay 1 Circuit in a Scion?

While some repairs may be possible for DIY enthusiasts, diagnosing and repairing electrical issues like this code may require professional expertise to ensure proper resolution.

9. How long does it typically take to repair OBDII code C1312 caused by a short in Main Relay 1 Circuit in a Scion?

The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a full day to diagnose and fix the problem correctly.

10. Will replacing the main relay solve the issue of OBDII code C1312 indicating a short in Main Relay 1 Circuit in my Scion?

Replacing the main relay is a common fix for this code, but it is essential to diagnose the problem accurately to ensure that replacing the relay resolves the issue completely.