Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK FOR OTHER DTCS
1. Turn the ignition on.
2. With the scan tool, read DTCs
  Are there any Purge Solenoid Control circuit, small or large Evap System leak (P0455, P0456) DTCs present?
  
  Yes
  - Perform the applicable diagnostic procedure(s) before continuing with this procedure. Refer to 1.4L TURBO - DIAGNOSTIC CODE INDEX - 500 .
  No
  - Go To 2
CHECK THE INTAKE MANIFOLD PORT FOR A RESTRICTION OR BLOCKAGE
NOTE:
It is important to note that a restriction in the vacuum supply may not decrease the vacuum reading but can still reduce the flow causing the purge performance diagnostic to fail. Therefore the vacuum port on the Intake Manifold and the Manifold Hose need to be inspected closely even if vacuum is present.
1. Remove the Manifold Hose vacuum line at the Intake Manifold vacuum port.
2. Visually inspect inside the vacuum port for restriction or blockage due to flashing or carbon build up.
  Is the port restricted?
  
  Yes
  - Repair the restriction in the vacuum port on the Intake Manifold.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK FOR A LEAK THROUGH THE PURGE SOLENOID
1. Install the Manifold Hose vacuum line to the Intake Manifold port.
2. Disconnect the Purge Tube (Call-out 6 in the Evap system figure) from the Purge Solenoid.
3. Connect a vacuum gauge to the Purge Tube port of the Purge Solenoid.
4. Start the engine and allow it to idle.
  NOTE:
  The purge Solenoid should not be on during this test. If the Purge Solenoid does turn on during testing, disconnect the solenoid harness connector to turn it off.
5. Check for vacuum at the Purge Tube port of the Purge Solenoid with the Purge Solenoid off.
  NOTE:
  There should not be vacuum present with the Purge Solenoid off.
  
  Is there any vacuum present?
  
  Yes
  - Replace the Purge Solenoid in accordance with the service information. Refer to SOLENOID, EVAPORATIVE EMISSIONS PURGE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE VACUUM SUPPLY AT THE CANISTER SIDE OF THE PURGE SOLENOID WITH PURGE ACTIVE
1. Allow the engine it to idle long enough for the Purge Solenoid to cycle on.
2. Check the vacuum supply at the Purge Tube port of the Purge Solenoid with the Pure Solenoid on.
  Is there sufficient engine vacuum present?
  
  Yes
  - Go To 6
  No
  - Go To 5
CHECK THE MANIFOLD HOSE AND THE VACUUM SUPPLY AT THE INLET OF THE PURGE SOLENOID
1. Turn the engine off.
2. Remove the Manifold Hose/Tube (Call-out 8 in the Evap system figure) at the inlet port of the Purge Solenoid.
3. Connect a vacuum gauge to the Manifold Hose/Tube.
4. Start the engine and allow it to idle.
5. Check the vacuum supply to the Purge Solenoid.
  Is there sufficient engine vacuum present?
  
  Yes
  - Replace the Purge Solenoid in accordance with the service information. Refer to SOLENOID, EVAPORATIVE EMISSIONS PURGE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Repair the broken or plugged Manifold Hose/Tube (Call-out 8 in the Evap system figure).
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK FOR A RESTRICTION IN THE PURGE TUBE
1. Turn the ignition off.
2. Remove the Purge Tube (Call-out 6 in the Evap system figure) from the vehicle.
3. Check the Purge Tube for a being pinched or restricted.
  Is the Purge Tube pinched or restricted?
  
  Yes
  - Repair the restriction or replace the Purge Tube.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 7
CHECK FOR A BLOCKAGE BETWEEN THE CHARCOAL CANISTER AND THE FUEL TANK PRESSURE SENSOR
1. Remove the Recirculation Tube (Call-out 9 in the Evap system figure) from the FTP Sensor.
2. Attach a hand vacuum pump to the FTP Sensor.
3. Turn the ignition on.
4. While monitoring the FTP Sensor reading on the scan tool, apply vacuum to the sensor.
  Does the FTP Sensor value change when applying vacuum to the sensor?
  
  Yes
  - Repair the restriction in the Canister Tube (Call-out 5 in the Evap system figure), Recirculation Tube (Call-out 9 in the Evap system figure) or Multi-Function Control Valve (Call-out 14 in the Evap system figure).
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 8
CHECK THE FTP SENSOR (K859) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Disconnect the FTP Sensor harness connector.
2. Measure the voltage on the (K859) FTP Sensor 5-Volt Supply circuit at the FTP Sensor harness connector.
  NOTE:
  If the 5-Volt Supply circuit to the sensor is lost it can cause the sensor voltage signal to stick mid-range between the normal operating parameters. This can cause this DTC to set because the PCM does not detect a change in the FTP Sensor signal as expected during purge operation.
  
  Is the voltage between 4.9 to 5.1 volts?
  
  Yes
  - Verify that there is good pin to terminal contact in the Fuel Tank Pressure Sensor connector. If no problems were found with the connector, replace the Fuel Tank Pressure Sensor in accordance with the service information. Refer to SENSOR, FUEL TANK PRESSURE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Repair the (K859) Fuel Tank Pressure Sensor 5-Volt Supply circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .