Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2006 Mazda 6 MazdaspeedFACTORY OEM SERVICE PROCEDURE
Symptom Troubleshooting [Engine Control System L3 With TC)
- Engine Control System Wiring Diagram
- Control System Device And Control Relationship Chart
- Foreword
- Intermittent Concern Troubleshooting
- Engine Symptom Troubleshooting
- Quick Diagnostic Chart
- No. 1 Melting Of Main Or Other Fuses
- No. 2 Mil Illuminates
- No. 3 Will Not Crank
- Start/Long Crank/Erratic Start/Erratic Crank
- No. 5 Engine Stalls-After Start/At Idle
- No. 6 Cranks Normally But Will Not Start
- No. 7 Slow Return To Idle
- No. 8 Engine Runs Rough/Rolling Idle
- No. 9 Fast Idle/Runs On
- No. 10 Low Idle/Stalls During Deceleration
- No. 11 Engine Stalls/Quits, Engine Runs Rough, Misses, Buck/Jerk, Hesitation/Stumble, Surges
- No. 12 Lack/Loss Of Power-Acceleration/Cruise
- No. 13 Knocking/Pinging
- No. 14 Poor Fuel Economy
- No. 15 Emission Compliance
- No. 16 High Oil Consumption/Leakage
- No. 17 Cooling System Concerns-Overheating
- No. 18 Cooling System Concerns-Runs Cold
- No. 19 Excessive Black Smoke
- No. 20 Fuel Odor (In Engine Compartment)
- No. 21 Engine Noise
- No. 22 Vibration Concerns (Engine)
- No. 23 A/C Does Not Work Sufficiently
- No. 24 A/C Is Always On Or A/C Compressor Runs Continuously
- No. 25 A/C Is Not Cut Off Under Wide Open Throttle Conditions
- No. 26 Exhaust Sulphur Smell
- No. 27 Fuel Refill Concerns
- No. 28 Fuel Filling Shut Off Issues
- No. 29 Constant Voltage
- No. 30 Spark Plug Condition
- Engine Control System Operation Inspection
- Input Signal System Investigation Procedure
- Investigate the ground system for variable resistance type 1
- Variable resistance type 2 (fuel tank level sensor and mass air flow (MAF) sensor)
- Notes
- Investigate the ground system for variable resistance type 2
- Investigate the input signal system for variable resistance type 2
- Investigate the electrical supply system for variable resistance type 2
- Thermistor type (IAT sensor and ECT sensor)
- Investigate the input signal system for thermistor type
- Investigate the ground system for thermistor type
- Main Relay Operation Inspection
- Intake Manifold Vacuum Inspection
- Electronic Throttle Control System Inspection
- Variable Swirl System Operation Inspection
- Fuel Injector Operation Inspection
- Fuel Cut Control System Inspection
- Fuel Pump Operation Inspection
- Fuel Pump Control System Inspection
- Fuel Pump Speed Control Inspection
- Spark Test
- EGR Control System Inspection
- Purge Control System Inspection
- A/C Cut-off Control System Inspection
- Cooling Fan Control System Inspection
- Wastegate Control System Operation Inspection
- Variable Valve Timing Control System Operation Inspection
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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