Circuit Description
WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
PCM monitors performance of EVAP system by applying a predetermined level of vacuum to EVAP system, then monitors the vacuum decay rate. PCM sets this DTC if vacuum decay rate is greater than a predetermined value.
DTC will set when the following conditions are present:
- DTCs P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0420, P0430, P0452, P0453, P0500, P0502, P0503, P0562, P0563, P1111, P1112, P1114, P1115, P1120, P1121, or HO2S related DTCs are not set.
- Ignition voltage is 10-17 volts.
- BARO pressure is greater than 75 kPa.
- Fuel level is 15-85 percent of full capacity.
- ECT and IAT are 39-86°F (4-30°C).
- Start-up ECT and IAT are within 16°F (9°C) of each other.
- EVAP vacuum decay rate is greater than predetermined value.
- Vacuum present in EVAP system is greater than predetermined value.
- Conditions present for more than 4 seconds.