Step
| Action
| Values
| Yes
| No
|
1
| Did you perform the Diagnostic System Check-Engine Controls?
| --
| Go to
Step 2
| Go to
Powertrain On Board Diagnostic (OBD) System Check
|
2
| Did DTC P0443, P0449, or P0453 set?
| --
| Go to
Diagnostic Trouble Code (DTC) List/Type
| Go to
Step 3
|
3
| Inspect the evaporative emission (EVAP) system for the following conditions:
• | A damaged EVAP vent valve |
• | A pinched EVAP vent hose |
Did you find and correct the condition?
| --
| Go to
Step 14
| Go to
Step 4
|
4
|
- Disconnect the purge line from the EVAP purge valve.
- Turn ON the ignition, with the engine OFF.
- Observe the fuel tank pressure (FTP) parameter with a scan tool.
Does the scan tool indicate FTP near the specified value?
| 0 in H2O
| Go to
Step 5
| Go to
Step 8
|
5
|
- Turn OFF the ignition.
- Reconnect all previously disconnected hardware.
- Install the J 41415
Fuel Fill Cap Adaptor.
- Connect the J 41413
EVAP Pressure and Purge Station and the fuel fill cap to the J 41415
.
- Turn ON the ignition, with the engine OFF.
- Command the EVAP canister vent valve ON with a scan tool.
Important: DO NOT exceed the specified value in this step. Exceeding the specified value
may produce incorrect test results.
- Pressurize the EVAP system to the first specified value with the J 41413
.
- Rotate the J 41413
rotary switch to the OFF/HOLD position.
- Command the EVAP canister vent valve OFF with a scan tool.
Does the scan tool indicate FTP near the second specified value?
| 5 in H2O
0 in H2O
| Go to Diagnostic Aids
| Go to
Step 7
|
6
| Disconnect the EVAP canister vent hose from the EVAP canister vent valve.
Does the scan tool indicate FTP within the specified range?
| -0.5 to +0.5 in H2O
| Go to
Step 10
| Go to
Step 7
|
7
| Disconnect the EVAP vent pipe from the EVAP canister.
Does the scan tool indicate FTP near the specified value?
| 0 in H2O
| Go to
Step 13
| Go to
Step 11
|
8
| Observe the FTP sensor voltage with a scan tool.
Is the FTP sensor voltage more than the specified value?
| 4.3 V
| Go to
DTC P0453 Fuel Tank Pressure Sensor Circuit High Voltage
| Go to
Step 9
|
9
| Test for poor connections at the harness connector of the FTP sensor. Refer
to
Testing for Intermittent Conditions and Poor Connections
and
Connector Repairs
in Wiring Systems.
Did you find and correct the condition?
| --
| Go to
Step 14
| Go to
Step 12
|
10
| Replace the EVAP canister vent valve. Refer to
Evaporative Emission Vent Valve Replacement
.
Did you complete the replacement?
| --
| Go to
Step 14
| --
|
11
| Replace the EVAP canister. Refer to
Evaporative Emission Canister Replacement
.
Did you complete the replacement?
| --
| Go to
Step 14
| --
|
12
| Replace the FTP sensor. Refer to
Fuel Tank Pressure Sensor Replacement
.
Did you complete the replacement?
| --
| Go to
Step 14
| --
|
13
| Repair the blockage in the EVAP vent hose.
Did you complete the repair?
| --
| Go to
Step 14
| --
|
14
|
- Turn ON the ignition, with the engine OFF.
- Command the EVAP canister vent valve ON with a scan tool.
Important: DO NOT exceed the specified value in this step. Exceeding the specified value
may produce incorrect test results.
- Pressurize the EVAP system to the specified value with the J 41413
.
- Turn the J 41413
rotary
valve to the OFF/HOLD position.
- Monitor the J 41413
pressure gage.
- Command the EVAP canister vent valve OFF with a scan tool.
Does the EVAP system pressure decrease?
| 5 in H2O
| Go to
Step 15
| Go to
Step 3
|
15
| With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?
| --
| Go to
Diagnostic Trouble Code (DTC) List/Type
| System OK
|