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 MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM LF 2.0L]ENGINE CONTROL SYSTEM OPERATION INSPECTION [LF]EVAP SYSTEM LEAK INSPECTION USING M-MDS
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans
EVAP System Leak Inspection Using M-MDS
2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION EVAP System Leak Inspection Using M-MDS
NOTE:
EVAP system test outline
EVAP system test description
EVAP system malfunction judgment
- The EVAP system test, which can substituted for the run drive cycle as an EVAP control system repair confirmation method, can be done while operating the M-MDS in the KOEO (Key On Engine Off) condition instead of actually driving the vehicle.
EVAP system test description
- 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 M-MDS 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:
- 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).
- 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.
- 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 evaporative gas leak occurred or not by reading the test results.
EVAP system malfunction judgment
- The PCM calculates the stored air pump load current value and send the results to the M-MDS as DTCs:
| DTC No. | Condition |
|---|---|
| P0442 | Evaporative emission control system leak detected (small leak) |
| P0446 | Change over valve (COV) (EVP system leak detection pump) stuck close |
| P0455 | Evaporative emission control system leak detected (gross leak) |
| P0456 | Evaporative emission system leak detected (very small leak) |
| P2401 | EVAP system leak detection pump motor circuit low |
| P2402 | EVAP system leak detection pump motor circuit high |
| P2404 | EVAP system leak detection pump sense circuit problem |
| P2405 | EVAP system leak detection pump sense circuit low input |
| P2407 | EVAP system leak detection pump sense circuit intermittent |
RENDER: 1.0x
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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.