Test NTC-12A - Checking EVAP System
NOTE:
For component location, see appropriate THEORY & OPERATION article.
- Start engine. Allow engine to reach operating temperature. Inspect throttle body-to-EVAP canister vacuum hoses for leaks or restrictions. Repair or replace hoses as necessary and perform TEST VER-2A. If hoses are okay, go to next step.
- Disconnect EVAP solenoid-to-EVAP canister hose. Using scan tool, select vapors test. Select No. 3. If EVAP solenoid does not allow vacuum to cycle through, replace EVAP solenoid and perform TEST VER-2A. If EVAP solenoid allows vacuum to cycle through, go to next step.
- Using scan tool, select No. 2. If EVAP solenoid allows vacuum to cycle through, replace EVAP solenoid and perform TEST VER-2A. If EVAP solenoid does not allow vacuum to cycle through, go to next step.CAUTION: DO NOT use more than 5 psi in following steps.
- Turn ignition off. Attempt to blow air through EVAP solenoid-to-canister hose. If air flows, EVAP solenoid and hoses are okay. Test passed. If air does not flow, go to next step.
- Disconnect EVAP solenoid-to-EVAP canister hose at EVAP canister. Attempt to blow air through EVAP solenoid-to-EVAP canister hose. If air flows, replace EVAP canister and perform TEST VER-2A. If air does not flow, repair or replace hose as necessary and perform TEST VER-2A.