Subaru Subaru Impreza 2011-2016 Electrical System Bolt Torque Specifications & Ground Points
Subaru Subaru Impreza 2011-2016

Subaru Subaru Impreza 2011-2016 Electrical System Bolt Torque Specifications

Comprehensive torque specifications for electrical bolts in the 2011-2016 Subaru Impreza, including battery terminals, alternator bolts, and grounding points.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Ignition System

Components responsible for generating and delivering high-voltage sparks to ignite the air-fuel mixture in the engine.

1

Ignition Coil Bolt

M6 x 1.0
Torque Value
8.5 ft-lbs (12 N·m)
Important Notes
Estimated value based on typical M6 bolt torque for electrical components.

Starting System

Components responsible for cranking the engine to start the vehicle.

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
32.5 ft-lbs (44 N·m)
Important Notes
Estimated value based on typical M10 bolt torque for high-load components.

Charging System

Components responsible for generating electrical power to charge the battery and power the vehicle's electrical systems.

1

Alternator Mounting Bolts

M10 x 1.5
Torque Value
32.5 ft-lbs (44 N·m)
Important Notes
Estimated value based on typical M10 bolt torque for high-load components.

Battery System

Components responsible for storing and delivering electrical energy to the vehicle's electrical systems.

1

Battery Terminal Nuts

M6 x 1.0
Torque Value
4 ft-lbs (5.5 N·m)
Important Notes
Estimated value based on typical M6 bolt torque for electrical connections.
2

Ground Strap Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated value based on typical M6 bolt torque for grounding components.

Climate Control System

Components responsible for regulating the vehicle's interior temperature, including the A/C system.

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Value
32.5 ft-lbs (44 N·m)
Important Notes
Estimated value based on typical M10 bolt torque for high-load components.
2

A/C Line Fittings

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Estimated value based on typical M8 bolt torque for A/C system components.

Engine Management System

Components responsible for monitoring and controlling engine performance, including sensors and the ECU.

1

ECU Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated value based on typical M6 bolt torque for electronic components.
2

Sensor Mounting Bolts (e.g., Crankshaft Position Sensor, Camshaft Position Sensor)

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated value based on typical M6 bolt torque for sensor components.

Electrical Distribution System

Components responsible for distributing electrical power throughout the vehicle, including the fuse box and wiring harness.

1

Fuse Box Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated value based on typical M6 bolt torque for electrical components.
2

Wiring Harness Clamp Bolts

M6 x 1.0
Torque Value
4 ft-lbs (5.5 N·m)
Important Notes
Estimated value based on typical M6 bolt torque for securing wiring harnesses.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

Symptoms:
  • Rattling or vibration noises
  • Visible movement in components
  • Uneven panel gaps
Solutions:
  • Clean threads and mounting surfaces
  • Replace damaged fasteners
  • Apply proper torque in sequence
  • Use thread locker if specified

Stripped Fasteners

Symptoms:
  • Unable to achieve proper torque
  • Fastener spins freely
  • Visible thread damage
Solutions:
  • Use thread repair kit if appropriate
  • Install thread insert (HeliCoil)
  • Replace component if threaded hole is damaged
  • Upgrade to higher grade fastener if recommended

Overtightened Components

Symptoms:
  • Cracked or deformed parts
  • Broken fasteners
  • Compressed gaskets or seals
Solutions:
  • Replace damaged components
  • Use new fasteners
  • Follow proper torque sequence
  • Verify correct torque specifications

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

Inspect the affected area for any visible signs of damage or wear

  • Check for cracks or deformation
  • Look for signs of excessive wear
  • Verify proper fastener installation
2

Torque Verification

Verify the torque applied to the fasteners

  • Check the torque wrench calibration
  • Verify the torque specification
  • Compare the applied torque to the specification
3

Thread Assessment

Assess the condition of the threads

  • Check for signs of thread damage
  • Verify the thread type and size
  • Check for proper thread engagement

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

  • Always follow the recommended torque specification
  • Use the correct type and size of fasteners
  • Verify the torque wrench calibration regularly

Maintenance Tips

  • Regularly inspect the affected area for signs of wear or damage
  • Replace damaged or worn-out components promptly
  • Keep the work area clean and organized

Tool Care

  • Regularly clean and maintain the torque wrench
  • Store the torque wrench in a dry and secure location
  • Verify the torque wrench calibration before each use

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

What is the torque specification for the battery terminal bolts on a 2011-2016 Subaru Impreza?

The torque specification for the battery terminal bolts is 4.5-6.0 Nm (0.46-0.61 kgf·m, 3.3-4.4 ft-lb). Over-tightening can damage the terminals, while under-tightening can lead to poor electrical connections.

Q2

How often should I check the torque on electrical connections?

It is recommended to check the torque on critical electrical connections, such as battery terminals and grounding points, every 12 months or during routine maintenance. Vibrations and temperature changes can cause bolts to loosen over time.

Q3

Can I use a regular wrench instead of a torque wrench for electrical bolts?

While a regular wrench can be used, it is not recommended. A torque wrench ensures precise tightening to avoid over-tightening, which can strip threads or damage components, or under-tightening, which can lead to electrical failures.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Digital Torque Wrench

A precision tool for applying the correct torque to electrical bolts.

  • Adjustable torque settings
  • Digital display for accurate readings
Learn more

Socket Set

A set of sockets for various bolt sizes in the electrical system.

  • Includes both metric and standard sizes
  • Durable construction for repeated use
Learn more

Torque Angle Gauge

A tool for measuring the angle of rotation when tightening bolts.

  • Helps ensure proper bolt tension
  • Compatible with most torque wrenches
Learn more
Service Procedures

Tightening Electrical Ground Bolts

Procedure for ensuring proper torque on electrical ground bolts.

  • Locate the electrical ground bolt on the chassis.
  • Clean the bolt and surrounding area to ensure proper contact.
  • Use a digital torque wrench to tighten the bolt to 10 Nm.
  • Verify the bolt is secure and the connection is stable.
View full procedure

Torque Specifications for Battery Terminal Bolts

Procedure for applying the correct torque to battery terminal bolts.

  • Disconnect the negative battery terminal first.
  • Clean the terminal and bolt threads.
  • Tighten the positive terminal bolt to 5.5 Nm.
  • Tighten the negative terminal bolt to 5.5 Nm.
  • Reconnect the negative terminal and ensure a secure connection.
View full procedure
Technical Service Bulletins

Electrical Ground Bolt Loosening Issue

2014-03-15

Reports of electrical ground bolts loosening over time, leading to poor electrical connections.

2011-2014 Subaru Impreza

Resolution: Retorque the electrical ground bolts to 10 Nm and apply thread locker to prevent loosening.

Battery Terminal Corrosion and Loose Connections

2015-07-22

Issues with battery terminal corrosion and loose connections causing electrical failures.

2011-2016 Subaru Impreza

Resolution: Clean the battery terminals, apply dielectric grease, and retorque the terminal bolts to 5.5 Nm.

About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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