EVAP Canister Vacuum Leak Pump Assembly Inspection: Notes
WARNING: This page is about a different variant/trim than selected.
CAUTION:
Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.
Evaporative Emission (EVAP) Control System Diagnosis
| EVAP Canister Vacuum Leak Pump - Electrical Connector Pin Identification | |||
|---|---|---|---|
| Reference Voltage | - | Sensor Ground | - |
| Ignition Voltage | Solenoid Control | Space | Ground |
- Remove the EVAP canister vacuum leak pump. Refer to Evaporative Emission (EVAP) System Vacuum Leak Pump Replacement .
- Use a DMM in order to measure the resistance of the EVAP vent solenoid that is located in the EVAP vacuum leak pump assembly.
- Connect the DMM to the ignition voltage terminal and the solenoid control terminal. Refer to the vacuum pump terminal identification table above.
Measure: The EVAP canister vent valve resistance should be 25-30 ohms at 20°C (68°F).
- Replace the EVAP vacuum leak pump assembly if the resistance is not within the specified range. The solenoid can damage the powertrain control module (PCM) if the resistance value is less than 25 ohms.
- Check the PCM and replace, if necessary. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
- Blow air into the air inlet port. The air should flow through the assembly and out of both ports.
- Apply battery voltage to the ignition voltage terminal and the solenoid control terminal. Refer to the vacuum pump terminal identification table above.
- Blow air into the air inlet port. The air should flow only through small port and NOT the large canister port.
- Replace the EVAP vacuum leak pump assembly if the pump failed either test. Refer to Evaporative Emission (EVAP) System Vacuum Leak Pump Replacement .