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 MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 334 (SYMPTOM TROUBLESHOOTING (ENGINE CONTROL SYSTEM AJ))ENGINE CONTROL SYSTEM OPERATION INSPECTIONEVAP SYSTEM LEAK INSPECTION USING WDS OR EQUIVALENTNOTEEVAP SYSTEM TEST DESCRIPTION

2010 Mazda 5 Sport, 2.3 L, Standard

EVAP system test description

2010 Mazda 5 Sport, 2.3 L, StandardSECTION EVAP system test description

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

The EVAP system test finds gas leaks in the system using the PCM to monitor changes in the air pump load current of the EVAP system leak detection pump. This test starts after sending an on-demand test signal from the WDS to the PCM. The PCM controls the air pump and change-over valve operation and also stores the load current of the air pump as follows:
1. The PCM commands turn the air pump on and retrieve the air pump load current value (LDP_MON PID) as a reference current (LDP_REF PID).
2. After retrieving a reference current value, the PCM commands the change-over valve to open, then captures the air pump load current value (LDP_MON PID) as idle current (LDP_IDL PID). The EVAP system will be pressurized from this phase.
3. The PCM continues to monitor the air pump load current value (LDP_MON PID) until the end of the test.
You can confirm whether any EVAP gas leak occurred or not by reading the test results.

Fig 1: EVAP System Test Signal Waveform
Courtesy of MAZDA MOTORS CORP.

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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.