System Diagnosis - with Upgraded Emissions
EVAP Canister Testing Metro W/ Upgraded Emissions:
EVAP CANISTER INSPECTION
1. Disconnect vacuum hoses from EVAP canister.
2. Using a small length of vacuum hose connected to the tank tube, blow into the EVAP canister. Air should escape from both the purge tube and air tube. If air does not escape from both tubes, replace EVAP canister.
Description:
EVAP CANISTER PURGE INSPECTION
1. Start engine, run until normal operating temperature is obtained.
2. Disconnect purge hose from EVAP canister.
3. Place finger against the end of the purge hose; vacuum should not be present when engine is idling.
4. increase engine speed to 2000 rpm.
5. Place finger against the end of the purge hose; vacuum should be present when engine speed is at 2000 rpm.
If EVAP canister purge valve fails the above test, go to EVAP SP valve inspection.
EVAP SOLENOID PURGE (EVAP SP) VALVE TEST
1. Disconnect EVAP SP valve electrical connector.
EVAP SP Valve Testing Metro W/ Upgraded Emissions:
2. Using an ohmmeter, measure resistance of EVAP SP valve between both terminals. If resistance is not between 30 - 39 ohms replace EVAP SP valve. If resistance is within specifications proceed to step 3.
3. Disconnect the EVAP SP valve vacuum hoses from intake manifold and the vacuum pipe (from EVAP canister)
Description:
4. Blow into EVAP SP valve hose that was disconnected from the vacuum pipe. Air should not pass through valve and exit from the intake manifold hose.
5. Connect 12 volts DC to the EVAP SP valve terminals.
6. Blow into EVAP SP valve hose that was disconnected from the vacuum pipe. Air should pass through valve and exit from the intake manifold hose.
7. If EVAP SP valve fails the above test, replace valve.
2-Way Check Valve:
TANK PRESSURE CONTROL (TPC) VALVE TEST
1. Remove the TPC valve.
2. Blow hard into BLACK side of valve, air should pass through valve.
3. Blow lightly into orange side of valve, air should pass through. If 2-way check valve does not function as above replace valve.