Test NTC-49: Readiness Test

NOTE: Readiness test requires a short road test. Ensure all components are reconnected and vehicle is driveable. Remove all test equipment except scan tool. If vehicle passes readiness test, condition that caused DTC to set is not present.

Clear DTCs from Powertrain Control Module (PCM). See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine under the following conditions to run EVAP leak detection test:
- Cold start. Using scan tool, read battery temperature sensor temperature. Battery temperature must be 40-89°F (4-31°C).
- Engine coolant temperature must be within 10°F (6°C) of battery temperature reading.
- Battery voltage must be 10-15 volts. If battery voltage changes to less than 10 volts during cranking, EVAP leak detection test will not run.
- LOW FUEL warning light must be off. On scan tool data list, LOW FUEL LEVEL SN 78 reading is less than 2 volts.
- MAP sensor reading must be 11 psi (5.5 kg/cm² ).
- Engine must not stall during test.
  NOTE: The following DTCs must not be set to run leak detection test.
- DTC 18 (DRB Scan Tool), P0443 (Generic Scan Tool), DTC 31 (MIL)
- DTC 02 (DRB Scan Tool), P0601 (Generic Scan Tool), DTC 53 (MIL)
- DTC 01 (DRB Scan Tool), P0340 (Generic Scan Tool), DTC 54 (MIL)
- DTC 40 (DRB Scan Tool), P0335 (Generic Scan Tool), N/A MIL
- DTC 132 (DRB Scan Tool), P0121 (Generic Scan Tool), DTC 24 (MIL)
- DTC 26 (DRB Scan Tool), P0122 (Generic Scan Tool), DTC 24 (MIL)
- DTC 30 (DRB Scan Tool), P0117 (Generic Scan Tool), DTC 22 (MIL)
- DTC 31 (DRB Scan Tool), P0118 (Generic Scan Tool), DTC 22 (MIL)
- DTC 36 (DRB Scan Tool), P0107 (Generic Scan Tool), DTC 14 (MIL)
- DTC 37 (DRB Scan Tool), P0108 (Generic Scan Tool), DTC 14 (MIL)
- DTC 39 (DRB Scan Tool), P1297 (Generic Scan Tool), DTC 13 (MIL)
- DTC 135 (DRB Scan Tool), P1296 (Generic Scan Tool), DTC 14 (MIL)
- DTC 153 (DRB Scan Tool), P1493 (Generic Scan Tool), DTC 44 (MIL)
- DTC 154 (DRB Scan Tool), P1492 (Generic Scan Tool), DTC 44 (MIL)
If scan tool engine coolant temperature or battery temperature readings do not meet the EVAP leak detection test requirements, see TEST NTC-50: READINESS TEST AIDS for additional information.

NOTE: Leak Detection Pump may also be referred to as evaporative emission ventilation solenoid.

Within 40 seconds of engine start-up, check that a light cycling or tapping can be felt at Leak Detection Pump (LDP) when the pump is activated. Leak detection pump is located on a mounting bracket on front of fuel tank. See Figure. If cycling or tapping cannot be felt at leak detection pump, go to next step. If cycling or tapping can be felt at leak detection pump, go to step 4.
Using scan tool, read DTCs. If any DTCs are present, perform appropriate diagnostic test before continuing with this test. See DTC & TEST IDENTIFICATION table under DIAGNOSTIC TROUBLE CODE DEFINITIONS. If no DTCs are present confirm that all required conditions to run EVAP leak detection test are met. If all required conditions are met, turn ignition off. Disconnect PCM connectors for about 2 minutes and then reconnect the connector. PCM is located at left front corner of engine compartment, in front of Electronic Automatic Transmission Electronic Control Module (EATX-ECM), near relay box.
Using scan tool in READINESS TEST press the YES key. Observe readiness test status on scan tool. To complete readiness test, PCM must sufficiently purge the EVAP system. Drive vehicle at 35-45 MPH on a level surface at a steady throttle (this may include slowing or stopping). It may take up to 10 minutes to complete readiness test. Readiness test is completed when EVAP: CMP is displayed on scan tool. If readiness test is not completed or vehicle does not meet all required conditions to run EVAP leak detection test, go to TEST NTC-50: READINESS TEST AIDS for additional information.