Test NTC-12A - Checking Evaporative Emissions Systems
NOTE:
Perform TEST NTC-1A or NTC-11A before proceeding.
- Start engine. Allow engine to reach normal operating temperature of 180°F (82°C). Inspect vacuum line from throttle to EVAP solenoid. Check for vacuum leaks or restrictions. If vacuum line is okay, go to next step. If vacuum line is not okay, repair vacuum line as necessary. Perform TEST VER-2A.
- Inspect vacuum line from EVAP solenoid to EVAP canister. Check for hose damage or restrictions. If vacuum line is okay, go to next step. If vacuum line is not okay, repair vacuum line as necessary. Perform TEST VER-2A.
- Allow engine to idle for 2 minutes after reaching normal operating temperature. Disconnect vacuum line at EVAP solenoid that goes to EVAP canister. 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, go to TEST TC-18A.CAUTION: DO NOT use more than 5 psi (.35 kg/cm2 ) 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 next step.
- Disconnect vacuum line at EVAP canister side that goes to EVAP solenoid. Attempt to blow air through vacuum line that goes to canister. If vacuum line allows air to pass, replace EVAP canister. Perform TEST VER-2A. If vacuum line does not allow air to pass, repair or replace vacuum line. Perform TEST VER-2A.