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.
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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM AJ)
2008 Mazda 6 s Sport, 4D Hatchback, Standard
Symptom Troubleshooting [Engine Control System AJ)
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Symptom Troubleshooting [Engine Control System AJ)
- Symptom Troubleshooting Wiring Diagram [AJ]
- Control System Device And Control Relationship Chart [AJ]
- Foreword [AJ]
- Intermittent Concern Troubleshooting [AJ]
- Symptom Diagnostic Index [AJ]
- Symptom Quick Diagnosis Chart [AJ]
- No. 1 Melting Of Main Or Other Fuses [AJ]
- No. 2 Mil Illuminates [AJ]
- No. 3 Will Not Crank [AJ]
- No. 4 Hard Start/Long Crank/Erratic Start/Erratic Crank [AJ]
- No. 5 Engine Stalls-After Start/At Idle [AJ]
- No. 6 Cranks Normally But Will Not Start [AJ]
- No. 7 Slow Return To Idle [AJ]
- No. 8 Engine Runs Rough/Rolling Idle [AJ]
- No. 9 Fast Idle/Runs On [AJ]
- No. 10 Low Idle/Stalls During Deceleration [AJ]
- No. 11 Engine Stalls/Quits, Engine Runs Rough, Misses, Buck/Jerk, Hesitation/Stumble, Surges [AJ]
- No. 12 Lack/Loss Of Power-Acceleration/Cruise [AJ]
- No. 13 Knocking/Pinging-Acceleration/Cruise [AJ]
- No. 14 Poor Fuel Economy [AJ]
- No. 15 Emission Compliance [AJ]
- No. 16 High Oil Consumption/Leakage [AJ]
- No. 17 Cooling System Concerns-Overheating [AJ]
- No. 18 Cooling System Concerns-Runs Cold [AJ]
- No. 19 Exhaust Smoke [AJ]
- No. 20 Fuel Odor (In Engine Compartment) [AJ]
- No. 21 Engine Noise [AJ]
- No. 22 Vibration Concerns (Engine) [AJ]
- No. 23 A/C Does Not Work Sufficiently [AJ]
- No. 24 A/C Always On/A/C Compressor Runs Continuously [AJ]
- No. 25 A/C Does Not Cut Off Under Wide Open Throttle Conditions [AJ]
- No. 26 Exhaust Sulphur Smell [AJ]
- No. 27 Fuel Refill Concerns [AJ]
- No. 28 Fuel Filling Shut Off Issues [AJ]
- No. 29 Spark Plug Condition [AJ]
- Engine Control System Operation Inspection [AJ]
- Input Signal System Investigation Procedure
- Notes
- Finding unusual signals
- Locating the source of unusual signals
- Variable resistance type 1 (APP sensor, TP sensor and EGR boost sensor)
- Investigate the input signal system for variable resistance type 1
- Investigate the standard power supply system for variable resistance type 1
- Investigate the GND system for variable resistance type 1
- Variable resistance type 2 (MAF sensor)
- Investigate the GND 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 GND system for thermistor type
- Main Relay Operation Inspection
- Intake Manifold Vacuum Inspection
- Electronic Throttle Control Inspection
- Fuel Injector Operation Inspection
- Fuel Cut Control System Inspection
- Fuel Pump Operation Inspection
- Fuel Pump Control System Inspection
- Ignition Timing Control Inspection
- Spark Test
- EGR Control System Inspection
- Purge Control System Inspection
- A/C Cut-off Control System Inspection
- Variable Air Duct (VAD) Control System Operation Inspection
- Evaporative Emission (EVAP) System Leak Inspection
- Main Fan/Additional Fan Motor Operation Inspection
- Variable Valve Timing Control System Operation Inspection
- Input Signal System Investigation Procedure
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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.