Detection Condition

PCM measures fuel tank pressure (ftp2), which is vacuum when a specified period has passed after EVAP system is sealed. PCM determines pressure difference between (ftp1) and (ftp2). If pressure difference exceeds threshold, PCM determines EVAP system has a small leak. This monitor can activate when PCM determines that CONSTANT LEAK DETECTED test results are passed.

Threshold Value  - Fuel tank pressure (ftp2-ftp1): 8.78-29.30 mm Hg (1.17-3.91 kPa). Threshold value varies depending on ECT at engine start and BARO.

Monitoring Conditions

• Fuel tank pressure is .34-1.15 in. Hg.
• Fuel remaining is 35-85 percent of total capacity.
• Intake air temperature is 14-140°F (-10-60°C) and engine coolant temperature is 14-95°F (-10-35°C) when engine is first started.
• Atmospheric pressure is more than 20.5 in. Hg.
• Vehicle speed is 24.5-74.7 MPH.
• Engine speed is 1000-4000 RPM.
• Calculated load is 9-65 percent.
• Throttle opening angle is 3.1-12.5 percent (without traction control).
• Throttle opening angle is 3.1-10.2 percent (with traction control).

This is an intermittent monitor. MIL is illuminated when PCM detects malfunction condition in 2 consecutive drive cycles. Diagnostic Monitoring Test Results and Pending code are available if PCM detects malfunction condition during first drive cycle. Freeze frame data is available and DTC is stored in PCM memory.