Mode D (Clogging of pipe diagnosis and leak pressure measurement)
WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
- Clogging of pipe
Purpose: Measure the time required for the evaporative emission system to reach the target negative pressure by the vacuum pump, and detect the clogging of pipe trouble.
Judge as clogging of pipe malfunction if the evaporative emission system reaches to the target negative pressure within the specified time.
JUDGMENT VALUE REFERENCE CHARTMalfunction Criteria Threshold Value DTC Time required to reach to the target negative pressure
When any one of the followings is established.< 30000 ms P1451 - Reference pressure for setting the target negative pressure - Pressure sensor output value
≥ Value of Map 4 - Pressure sensor output value
< -5 kPa (-37.298 mmHg, -1.5 inHg) PRESSURE SPECIFICATION CHARTTime of negative pressure introduction ms 0 100000 200000 300000 400000 500000 600000 700000 800000 900000 1000000 1100000 1200000 Reference pressure for setting the target negative pressure - Pressure sensor output value kPa (mmHg, inHg) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) 0.9 (7.058, 0.3) - Leak pressure measurement
Purpose: Measure the pressure (leak pressure) when the evaporative emission system becomes the negative pressure by the vacuum pump.
Store the pressure as a leak pressure while the following conditions are met.
JUDGMENT VALUE REFERENCE CHARTConditions for storing the leak pressure Threshold Value When any one of the followings is established. - Reference pressure for setting the target negative pressure - Pressure sensor output value
≥ Value of Map 4 - Pressure sensor output value
< -5 kPa (-37.298 mmHg, -1.5 inHg) - Time of negative pressure introduction
≥ 900000 ms