EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK INSPECTION
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To verify that the problem has been fixed properly after repairs, the run drive cycle or EVAP system leak
inspection must be performed.
EVAP system leak inspection using the M-MDS
EVAP system test out line
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The EVAP system test, which can substituted for the run drive cycle as an EVAP control system repair
confirmation method, can detect the small / large leak or blockage without run-drive cycle.
EVAP system test description
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The EVAP system test finds gas leaks or blockage of EVAP system using the changes of the fuel tank
pressure.
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This test starts after sending an on-demand test signal from the M-MDS to the PCM.
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This test consists of three stages, and each stage is performed automatically as follows:
Stage 1 test. (Test for large leak or blockage)
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M-MDS send the stage 1 test start signal to the PCM.
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PCM controls the CV solenoid valve and purge solenoid valve to control the tank pressure to
the targeted value.
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M-MDS detect the large leak or the purge line blockage if the tank pressure does not arrive at
the target vacuum in specified period.
Stage 2 test. (Test for small leak)
NOTE:
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Use the IDS (laptop PC) because the PDS (Pocket PC) does not support
the EVAP system test.
NOTE:
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M-MDS can not detect "VERY SMALL LEAK". To identify the leak
point, please use the leak tester or ultrasonic leak detector.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:06 AM
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