DTC P1441 Evaporative Emission (EVAP)
System Flow During Non-Purge
The PCM monitors the
amount of vacuum/pressure in the EVAP system by monitoring the fuel tank
pressure sensor signal. The PCM seals the EVAP system by commanding the EVAP
Purge Solenoid OFF and the EVAP vent valve ON. The PCM monitors the fuel tank
pressure sensor in order to determine if the EVAP Purge Solenoid is leaking
vacuum to the EVAP system. This DTC sets if the vacuum in the EVAP system is
greater than a predetermined value within a predetermined time.
Conditions for Running the DTC
- DTCs P0107, P0108, P0112, P0113,
P0121, P0122, P0123, P0420, P0430, P0500, P0502, P0503, P1111, P1112,
P1114, P1115, and HO2
- The ignition voltage is between
10.0 volts and 17.0 volts.
- The barometric pressure is greater
than 75 kPa.
- The fuel level is between 15% and
85% of full capacity.
- The engine coolant temperature is
between 4°C (39°F) and 30°C (86°F).
- The intake air temperature is
between 4°C (39°F) and 30°C (86°F).
- The start up engine coolant and
intake air temperatures are within 9°C (16°F) of each other.
- The EVAP Purge Solenoid duty cycle
is 0%.
- The TP angle is between 0% and
99.6%.
Conditions
for Setting the DTC
The EVAP system develops
a vacuum greater than a predetermined value when purge is not commanded.
Action
Taken When the DTC Sets
- The PCM illuminates the malfunction
indicator lamp (MIL) on the second consecutive ignition cycle that the
diagnostic runs and fails.
- The PCM records the operating
conditions at the time the diagnostic fails. The first time the diagnostic
fails, the PCM stores this information in the Failure Records. If the
diagnostic reports a failure on the second consecutive ignition cycle, the
PCM records the operating conditions at the time of the failure. The PCM
writes the conditions to the Freeze Frame and updates the Failure Records.
Conditions
for Clearing the MIL/DTC
- The PCM turns OFF the malfunction
indicator lamp (MIL) after 3 consecutive ignition cycles that the
diagnostic runs and does not fail.
- A last test failed, or current DTC,
clears when the diagnostic runs and does not fail.
- A history DTC clears after
40 consecutive warm-up cycles, if no failures are reported by this or
any other emission related diagnostic.
- Use a scan tool in order to clear
the MIL and the DTC.
Before replacing any
components, visually/physically inspect for the following:
- Mis-routed harness.
- Rubbed through wire insulation
- Broken wire inside the insulation
- Kinked or damaged vacuum hoses
- Physically damaged system components
- Inspect components and vacuum lines
for traces of carbon or other contaminants. The presence of foreign
material may be causing a restriction in the system or preventing the
solenoid valve from closing properly. Either condition may cause a DTC to
set.
For an intermittent
condition, refer to Symptoms
.
The numbers below refer
to the step numbers on the Diagnostic Table.
- This step tests for a
EVAP Purge Solenoid Valve that is leaking vacuum to the EVAP system when
EVAP system purge is not commanded by the PCM.
Inspect for possible carbon contamination
of the EVAP Purge Solenoid Valve and the purge line.
|
Step |
Action |
Value(s) |
Yes |
No |
|
Did
you perform the Powertrain On-Board Diagnostic
(OBD) System Check? |
-- |
|||
Does
the vacuum gauge indicate a vacuum? |
-- |
Go to Diagnostic Aids |
||
|
Important Inspect for carbon
contamination. Refer to EVAP
System Cleaning . Replace
the EVAP Purge Solenoid Valve. Refer to EVAP
Canister Purge Solenoid Valve Replacement . Is the action complete? |
-- |
-- |
||
Does
the scan tool indicate that this test ran and passed? |
-- |
|||
|
Select
the Capture Info option and the Review Info option using the scan tool. Does
the scan tool display any DTCs that you have not diagnosed? |
-- |
Go to the applicable
DTC |
System OK |