Detection Condition

PCM measures fuel tank pressure (ftp a) and (ftp b) when monitoring conditions are met.

Monitoring Condition

• Atmospheric pressure is more than 20.5 in. Hg.
• Fuel remaining is 35-85 percent of total capacity.
• Intake air temperature is 14-140°F (-10-60°C).
• Engine coolant temperature is 95°F (35°C) or less when engine is first started.
• Engine coolant temperature is 158-226°F (70-108°C).
• Throttle opening angle is closed.
• Within 16 minutes of engine start.

If difference between (ftp a) and (ftp b) exceeds threshold, PCM determines EVAP system has a very small leak (0.02 inch (0.5 mm) hole equivalent). This is an intermittent monitor. MIL is illuminated when PCM detects malfunction condition in 2 consecutive drive cycles. Pending code is available if PCM detects malfunction condition during first drive cycle. Freeze frame data is available and DTC is stored in PCM memory.