Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- An EVAP canister purge solenoid valve or EVAP canister vent solenoid valve circuit fault may have caused this DTC to set.
- The ECM uses the FTP sensor to detect the amount of vacuum pulled on the EVAP system during the leak diagnostic tests. Ensure that the fuel pressure sensor is not skewed by verifying the FTP sensor on the scan tool is between 1.30-1.70 volts with the ignition ON and the fuel cap removed.
- Locate the small leak with the J 41413-200
(J 41413-100) Evaporative Emission System Tester. See Special Tools
.
- The following are possible causes of a small leak:
- The fuel cap is leaking.
- The EVAP canister vent solenoid valve is not seating correctly.
- The EVAP vent hose is loose or damaged.
- The EVAP canister is leaking.
- The fuel sender assembly O-ring is leaking.
- The fuel tank or filler neck is leaking.
- The small leak diagnostic can detect a leak greater than 0.020 of an inch in diameter.
- A condition may exist where a leak in the EVAP system only exists under a vacuum condition. By using the scan tool Purge/Seal function to create a vacuum, seal the system and observe the FTP parameter for vacuum decay, this type of leak may be detected.
DTC P0442
| Step |
Action |
Yes |
No |
| Schematic Reference: Evaporative Emissions (EVAP) Hose Routing Diagram |
| 1 |
Did you perform the Diagnostic System Check - Vehicle? |
Go to Step 2 |
Go to Diagnostic System Check - Vehicle |
| 2 |
IMPORTANT:
Larger volume fuel tanks and/or those with lower fuel levels may require several minutes to stabilize.
- Turn the nitrogen/smoke valve to nitrogen.
- Connect the nitrogen/smoke hose to the 0.5 mm (0.20 in) test orifice on the bottom-front of the J 41413-200
(J 41413-100) Evaporative Emissions System Tester (EEST). See Special Tools
.
- Use the remote switch to activate the J 41413-200
(J 41413-100). See Special Tools
.
- Align the red flag on the flow meter with the floating indicator. Use the remote switch to de-activate the J 41413-200
(J 41413-100). See Special Tools
.
- Install the GE-41415-50
Fuel Tank Cap Adapter to the fuel fill pipe. See Special Tools
.
- Remove the nitrogen/smoke hose from the test orifice and install the hose onto the GE-41415-50
. See Special Tools
.
- Turn ON the ignition, with the engine OFF.
- Command the EVAP canister vent solenoid valve CLOSED with a scan tool.
- Use the remote switch to introduce nitrogen and fill the EVAP system until the floating stabilizes.
- Compare the flow meter's stable floating indicator position to the red flag.
Is the floating indicator below the red flag? |
Go to Diagnostic Aids |
Go to Step 3 |
| 3 |
IMPORTANT:
Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. System flow will be less with higher temperatures.
- Turn OFF the ignition.
- Connect the J 41413-200
(J 41413-100) power supply clips to a known good 12-volt source. See Special Tools
.
- Install the GE-41415-50
to the fuel fill pipe. See Special Tools
.
- Connect the fuel fill cap to the GE-41415-50
. See Special Tools
.
- Connect the J 41413-200
(J 41413-100) nitrogen/smoke supply hose to the GE-41415-50
. See Special Tools
.
- Turn ON the ignition with the engine OFF.
- Command the EVAP canister vent solenoid valve closed with a scan tool.
- Turn the nitrogen/smoke valve on the J 41413-200
(J 41413-100) control panel to SMOKE. See Special Tools
.
- Use the remote switch to introduce smoke into the EVAP system.
- Use the J 41413-VLV
EVAP Service Port Vent Fitting to open the EVAP service port. See Special Tools
.
- Remove the J 41413-VLV
once smoke is observed. See Special Tools
.
- Continue to introduce smoke into the EVAP system for an additional 60 seconds.
- Inspect the entire EVAP system for exiting smoke with a High Intensity White Light.
- Continue to introduce smoke at 15 second intervals until the leak source has been located.
Did you locate and repair a leak source? |
Go to Step 5 |
Go to Step 4 |
| 4 |
- Disconnect the GE-41415-50
from the fuel fill pipe. See Special Tools
.
- Install the fuel fill cap to the fuel fill pipe.
- Connect the J 41413-200
(J 41413-100) nitrogen/smoke supply hose to the EVAP service port. See Special Tools
.
- Use the remote switch to introduce smoke into the EVAP system.
- Inspect the entire EVAP system for exiting smoke with a High Intensity White Light.
- Continue to introduce smoke at 15 second intervals until the leak source has been located.
Did you locate and repair a leak source? |
Go to Step 5 |
Go to Diagnostic Aids |
| 5 |
IMPORTANT:
Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
- Turn the nitrogen/smoke valve to nitrogen.
- Connect the nitrogen/smoke hose to the 0.5 mm (0.20 in) test orifice on the bottom-front of the J 41413-200
(J 41413-100). See Special Tools
.
- Use the remote switch to activate the J 41413-200
(J 41413-100). See Special Tools
.
- Align the red flag on the flow meter with the floating indicator. Use the remote switch to de-activate the J 41413-200
(J 41413-100). See Special Tools
.
- Install the GE-41415-50
to the fuel fill pipe. See Special Tools
.
- Remove the nitrogen/smoke hose from the test orifice and install the hose onto the GE-41415-50
. See Special Tools
.
- Turn ON the ignition, with the engine OFF.
- Command the EVAP canister vent solenoid valve closed with a scan tool.
- Use the remote switch to introduce nitrogen and fill the EVAP system until the floating stabilizes.
- Compare the flow meter's stable floating indicator position to the red flag.
Is the floating indicator below the red flag? |
Go to Step 6 |
Go to Step 2 |
| 6 |
Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle |
System OK |