Test 12 - Canister Purge Solenoid
- Check vacuum hoses for leaks or blockage and check vacuum source. Repair leaks or blockage, if present and proceed with testing.
- Check to ensure canister purge solenoid passes vacuum when energized with 12 volts, and blocks vacuum when de-energized. Check housing and hose for leaks. If solenoid is okay, proceed to next step. If not, replace solenoid and retest.
- Disconnect MCU and canister purge connector. Check continuity between MCU connector pin 24 and canister purge connector. Also check between pin 20 and canister purge connector. If resistance of each circuit is less than 5 ohms, go to next step. If not, repair circuits.
- Connect ohmmeter between ground and MCU connector pin 24. If resistance is greater than 1000 ohms, replace MCU. If less, repair short circuit to ground.