Enabling Conditions To Run EVAP Leak Detection Test
- Cold start: with ambient temperature (obtained from modeling the inlet air temperature sensor on passenger vehicles and the battery temperature sensor on Jeep & truck vehicles) between 4°C (40°F) and 32°C (90°F) for 0.040 leak. Between 4°C (40°F) and 29°C (85°F) for 0.020 leak.
- Engine coolant temperature within: -12° to -8°C (10° to 18°F) of battery/ambient.
- Battery voltage between 10 and 15 volts.
- Low fuel warning light off (fuel level must be between 15% and 85%).
- MAP sensor reading 22 in Hg or above (This is the manifold absolute pressure, not vacuum).
- No engine stall during test.
NOTE:
If battery voltage drops below 10 volts for more than 5 seconds during engine cranking, the evap leak detection test will not run.
NOTE:
The following values are approximate and vehicle specific. Use the values seen in pre test/monitor test screen on the DRBIII® See TSB 25-02-98 NON TURBO GAS ENGINE I/M OBDII "CARB" READINESS
for more detail.
A DTC will not set if a one-trip fault is set or if the MIL is illuminated for any of the following:
- Purge Solenoid
- All engine Controller Self Test Faults
- All Cam and/or Crank Sensor Faults
- MAP Sensor Faults
- Ambient/Battery Temperature Sensor Electrical Faults
- All Coolant Sensor Faults
- All TPS Faults
- LDP Pressure Switch Faults
- EGR Solenoid Electrical Faults
- All Injector Faults
- Baro Out Of Range
- Vehicle Speed Faults
- LDP Solenoid Circuit