Detection Condition

PCM measures Fuel Tank Pressure (FTP-2), which is the vacuum when a specified period of time has passed after EVAP system is sealed. PCM determines FTP pressure difference between FTP-l and FTP-2. If pressure differential exceeds threshold, PCM determines that EVAP system has a small leak. This monitor can activate when PCM determines that CONSTANT LEAK DETECTED test results are passed. PCM monitors EVAP system when driving under following conditions:

Monitoring Conditions

• FTP (FTP-2 and FTP-1) .38 in. Hg. (1.27 kPa).
• Fuel remaining is 15-85 percent of total capacity.
• Intake air temperature is 14-140°F (-10-60°C) when engine is first started.
• Engine coolant temperature is 14-95°F (-10.0-35°C) when engine is first started.
• Atmospheric pressure is more than 21.3 in. Hg. (72.2 kPa).
• Vehicle speed is 24.5-74.5 MPH.
• Engine speed is 1000-4000 RPM.
• Calculated load is 9.4-65 percent.
• Throttle opening angle is 3.13-31.6 percent.
• Intake air temperature is 14-140°F (-10-60°C) during monitoring.
• Engine coolant temperature is 158-212°F (70-100°C) during monitoring.

This is an intermittent monitor (Evaporative leak monitor). MIL illuminates if PCM detects malfunction condition in 2 consecutive drive cycles. Diagnostic Monitoring Test Results and Pending Code are stored if PCM detects malfunction condition during first drive cycle. Freeze Frame Data is available and DTC is stored in PCM memory.