DTC P0455. Saturn L300/LW300 2003

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2003 🢒 L300/LW300 🢒 Engine 🢒 Engine Controls - 3.0L (L81) 🢒 DTC P0455

Engine Controls Component Views
Engine Controls Schematics

System Description

The evaporative emission (EVAP) system is used to store fuel vapors as to reduce the amount of unburned fuel from escaping into the atmosphere. The EVAP system consists of the EVAP canister, fuel tank pressure (FTP) sensor, EVAP lines and hoses, EVAP purge solenoid (normally closed), EVAP service port, EVAP vent solenoid (normally open) and fuel tank. The engine control module (ECM) monitors the EVAP system for circuit faults in the EVAP purge solenoid, EVAP vent solenoid and FTP sensor circuits. The ECM also monitors the EVAP for leaks between EVAP vent and purge solenoid. When certain conditions have been met, the ECM will perform an EVAP diagnostic test at idle with no vehicle speed. DTC P0455 will set if a vacuum cannot be pulled on the EVAP system during the EVAP diagnostic system test indicating a large EVAP system leak or insufficient vacuum to EVAP purge solenoid.

Conditions for Running the DTC

•

DTCs P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057, P0058, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0131, P0132, P0133, P0134, P0135, P0136, P0137, P0138, P0139, P0140, P0141, P0150, P0151, P0152, P0153, P0154, P0155, P0156, P0157, P0158, P0159, P0160, P0161, P0221, P0222, P0223, P0442, P0443, P0444, P0445, P0446, P0447, P0448, P0449, P0451, P0452, P0453, P0506, P0507, P1271, P1277, P1278, P1282, P1283, P1511, P1516, P1519, P1523, P1526, P1530, P1551, P2100, P2101, P2107, P2119, P2122, P2123, P2127, P2128, P2138, P2176 are not set.

•	The condition exists for 15 seconds or no change is detected for 4 seconds.

•	The EVAP purge solenoid is commanded to a 20 percent duty cycle.

•	The EVAP vent solenoid is commanded ON.

•	The engine is at idle.

•	The vehicle speed is 0 km/h (0 mph).

•	The engine load is less than 35 percent.

•	The manifold absolute pressure (MAP) is less than 40 kPa.

•	The battery voltage is greater than 11 volts.

•	The engine coolant temperature (ECT) at engine startup is between 8-75°C (46-167°F).

•	The intake air temperature (IAT) is between 8-75°C (46-167°F).

•	The long term FT cells learned (if not learned, engine must run longer than 16 minutes and 45 seconds).

DTC P0455 diagnostic runs once during Phase D of the EVAP diagnostic test once per ignition cycle. If DTC P0455 fails, the ECM will re-run the EVAP diagnostic test from the beginning and must fail P0455 again to set.

If an EVAP diagnostic test is aborted due to changing enabled criteria, the ECM will run the entire EVAP test up to three times per ignition cycle.

Conditions For Setting the DTC

DTC P0455 will set if the FTP cannot be pulled lower than 2.02 volts, -4.50 mm Hg (-2.41 in H20), during the EVAP diagnostic system test indicating a large EVAP leak.

Action Taken When the DTC Sets

•	The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.

•

The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the DTC

•	A current DTC Last Test Failed clears when the diagnostic runs and passes.

•	A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.

•	Clear the DTC with a scan tool.

Diagnostic Aids

•	If DTC P0440, P0442, P0446, P0455 is set, EVAP special functions on the scan tool will not be allowed. Clear DTCs before performing these tests.

•	The ECM uses the FTP sensor to detect the pressure of fuel vapor in the fuel tank during all parts of the EVAP diagnostic system test. Ensure the FTP sensor is not skewed by verifying FTP Sensor on the scan tool is between 2.35-2.85 volts with the ignition ON and the engine OFF.

•	Possible causes of a large EVAP leak:

•	The fuel cap is missing, incorrectly installed or leaking.

•	The EVAP vent solenoid valve stuck open.

•	The EVAP purge solenoid stuck closed/blocked or lack of manifold vacuum to solenoid.

•	The EVAP line/hose connections are disconnected/leaking.

•	The fuel sender O-ring is leaking.

•	The FTP sensor seal is leaking.

•	To help locate intermittent leaks, use the J 41413-200 (J 41413-100) Evaporative Emissions System Tester (EEST) to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with the High Intensity White Light.

•	To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with a High Intensity White Light.

•	Review the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to set occurs. This may assist in diagnosing the condition.

•	For intermittent conditions refer to Intermittent Conditions .

Step

Action

Values

Yes

Schematic Reference: Evaporative Emissions Hose Routing Diagram

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

Observe the Freeze Frame/Failure Records for this DTC.
Perform the Service Bay Test. Refer to Service Bay Test .

Does the scan tool indicate that the Service Bay Test passed?

Go to Diagnostic Aids

Go to Step 3

Inspect the evaporative emission (EVAP) system for the following conditions:

•	A loose, missing, or damaged service port schrader valve

•	A loose, incorrect, missing, or damaged fuel fill cap

•	A damaged EVAP purge solenoid

Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information.
Inspect the EVAP system for the following conditions:

•	Any disconnected, improperly routed, kinked, or damaged EVAP pipes and hoses

•	A damaged EVAP vent solenoid or EVAP canister

Did you find and correct the condition?

Go to Step 19

Go to Step 4

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) Evaporative Emissions System Tester (EEST) power supply clips to a known good 12-volt source.
Install the J 41413-200 (J 41413-100) to the fuel fill pipe.
Connect the fuel fill cap to the J 41415-40 .
Connect the J 41413-200 (J 41413-100) nitrogen/smoke supply hose to the J 41415-40 .
Turn ON the ignition, with the engine OFF.
Command the EVAP vent solenoid closed with a scan tool.
Turn the nitrogen/smoke valve on the J 41413-200 (J 41413-100) 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 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 19

Go to Step 5

Disconnect the J 41415-40 from the fuel fill pipe.
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.
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 19

Go to Step 6

Use the remote switch to stop introducing smoke.
Install the J 41415-40 to the fuel fill pipe.
Connect the J 41413-200 (J 41413-100) nitrogen/smoke supply hose to the J 41415-40 .
Connect the vehicle fuel fill cap to the J 41415-40 .
Command the EVAP vent solenoid open with a scan tool.
Compare the Fuel Tank Pressure Sensor parameter, with a scan tool, to the J 41413-200 (J 41413-100) pressure/vacuum gage.

Is the scan tool Fuel Tank Pressure Sensor parameter within the specified value of the J 41413-200 (J 41413-100) pressure/vacuum gage?

1 in H2O

Go to Step 7

Go to Step 16

Seal the EVAP system using the EVAP Purge/Seal function with a scan tool.
Turn the nitrogen/smoke valve on the J 41413-200 (J 41413-100) control panel to NITROGEN.
Use the J 41413-200 (J 41413-100) to pressurize the EVAP system to the first specified value.

Is the Fuel Tank Pressure Sensor parameter more than the second specified value?

10 in H2O

5 in H2O

Go to Step 8

Go to Step 16