Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- 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.
- To help locate intermittent leaks, use the J 41413-200
Evaporative Emission System Tester (EEST) to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with the J 41413-SPT
High Intensity White Light.
- To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT
.
- For intermittent conditions, refer to Intermittent Conditions
.
DTC P0442
| Step |
Action |
Yes |
No |
| Schematic Reference: Evaporative Emissions Hose Routing Diagram |
| 1 |
Did you perform the Diagnostic System Check - Vehicle? |
Go to Step 2 |
Go to Diagnostic System Check - Vehicle
in Vehicle DTC Information |
| 2 |
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 (0.02 in) test orifice on the bottom-front of the J 41413-200
Evaporative Emission System Tester (EEST).
- Use the remote switch to activate the J 41413-200
.
- Align the red flag on the flow meter with the floating indicator. Use the remote switch to deactivate the J 41413-200
.
- Install the J 41415-40
or 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 J 41415-40
or GE-41415-50
. See Special Tools
.
- Turn ON the ignition, with the engine OFF.
- Command the evaporative emission (EVAP) vent solenoid 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 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
power supply clips to a known good 12-volt source.
- Install the J 41415-40
or GE-41415-50
to the fuel fill pipe. See Special Tools
.
- Connect the J 41413-200
nitrogen/smoke supply hose to the J 41415-40
or GE-41415-50
. See Special Tools
.
- Turn ON the ignition, with the engine OFF.
- Command the EVAP vent solenoid valve closed with a scan tool.
- Turn the nitrogen/smoke valve on the J 41413-200
control panel to SMOKE.
- 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.
- Remove the J 41413-VLV
once smoke is observed.
- Continue to introduce smoke into the EVAP system for an additional 60 seconds.
- Inspect the entire EVAP system for exiting smoke with the J 41413-SPT
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 J 41415-40
or 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
nitrogen/smoke supply hose to the EVAP service port.
- Use the remote switch to introduce smoke into the EVAP system.
- Inspect the entire EVAP system for exiting smoke with the J 41413-SPT
.
- 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 (0.02 in) test orifice on the bottom-front of the J 41413-200
.
- Use the remote switch to activate the J 41413-200
.
- Align the red flag on the flow meter with the floating indicator. Use the remote switch to deactivate the J 41413-200
.
- Install the J 41415-40
or 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 J 41415-40
or GE-41415-50
. See Special Tools
.
- Turn ON the ignition, with the engine OFF.
- Command the EVAP vent solenoid valve closed with a scan tool.
- Use the remote switch to introduce nitrogen and fill the EVAP system until the floating indicator stabilizes.
- Compare the flow meter 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
in Vehicle DTC Information |
System OK |