Test NTC-17A: Checking Evaporative Emissions Systems
NOTE:
Perform TEST NTC-1A or TEST NTC-3A
before proceeding.
- Carefully inspect all vacuum hoses for proper routing. Check for pinched or plugged hoses from engine to EVAP solenoid, to fuel tank. If hoses are okay, go to next step. If hoses are not okay, repair as necessary. Perform TEST VER-2A .
- Start engine. Allow engine to reach normal operating temperature of 180°F (82°C). Turn engine off. Disconnect vacuum line at EVAP solenoid that goes to EVAP canister. Start engine. There should not be airflow through EVAP solenoid for 1-2 minutes after starting engine. If EVAP solenoid does not allow vacuum to pass within one minute, go to next step. If EVAP solenoid is allowing vacuum to pass within one minute, go to step 5) .
- After 90 seconds, EVAP solenoid should allow vacuum to cycle through intermittently at a steady rate. If EVAP solenoid is allowing vacuum to cycle through intermittently at a steady rate, go to next step. If EVAP solenoid is not allowing vacuum to cycle through intermittently at a steady rate, replace EVAP solenoid. Perform TEST VER-2A .CAUTION: DO NOT use more than 5 psi (34 kPa) when performing the following steps.
- Turn ignition off. Attempt to blow air through the vacuum line that goes to EVAP canister. If EVAP canister and vacuum line allow air to pass, purge solenoid and hoses are okay. Test is complete. If EVAP canister and vacuum line do not allow air to pass, go to TEST NTC-17B .
- Remove EVAP purge solenoid. Tap solenoid ports against a clean surface. If any foreign material falls out, go to next step. If foreign material did not fall out, replace EVAP purge solenoid. Perform TEST VER-2A .
- Inspect vacuum line from EVAP purge solenoid to canister. If vacuum line is damaged, replace vacuum line and replace EVAP purge solenoid. Perform TEST VER-2A . If vacuum line is not damaged, clean out line and replace EVAP purge solenoid and canister. Perform TEST VER-2A .