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.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 600 (SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM L3 WITH TC))ENGINE CONTROL SYSTEM OPERATION INSPECTIONFUEL CUT CONTROL SYSTEM INSPECTION

2008 Mazda 6 s Sport, 4D Hatchback, Standard

Fuel Cut Control System Inspection

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Fuel Cut Control System Inspection

WARNING: This page is about a different car, the 2007 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

This inspection has to be performed after the Fuel Injector Operation Inspection.

If simulation function of M-MDS is used:

Warm up the engine and idle it.
Connect the M-MDS to the DLC-2.
Select the RPM and the FUELPW1 PIDs.
Monitor both PIDs while performing the following steps.
1. Depress the accelerator pedal and increase the RPM PID to 4,000 RPM.
2. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the FUELPW1 PID is 0 msec , and 2-5 msec , when the RPM PID drops below 1,200 RPM.
  - If not as specified, inspect the following.
    - ECT sensor and related wiring harness
      (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION ).
    - Neutral switch and related wiring harness
      (See NEUTRAL SWITCH INSPECTION ).
    - Clutch switch and related wiring harness
      (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION ).

If simulation function of M-MDS is not used:

Warm up the engine and idle it.
Measure the fuel injector control signal wave profile using the oscilloscope while performing the following steps.
1. Depress the accelerator pedal and increase the engine speed to 4,000 RPM.
2. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the wave profile constant B+ , and the wave appears when the engine speed drops below 1,200 RPM.
  (See PCM INSPECTION ).
  - If not as specified, inspect the following.
    - ECT sensor and related wiring harness
      (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION ).
    - Neutral switch and related wiring harness
      (See NEUTRAL SWITCH INSPECTION ).
    - Clutch switch and related wiring harness
      (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION ).

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

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.