Dtc P0442 - Suzuki XL7 2007 Service Manual

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1A-111 Engine General Information and Diagnosis:

DTC P0442

Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
• "Strategy Based Diagnosis: "
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: "
DTC Descriptors
DTC P0442: Evaporative Emission (EVAP) System
Small Leak Detected
Circuit Description
This diagnostic tests the evaporative emission (EVAP)
system for a small leak. The diagnostic runs when the
ignition is in the OFF position, and the correct conditions
are met. While the engine is operating, there are sources
of heat transferred into the fuel tank from the following:
• Exhaust heat
• Engine heat
• Ambient temperature
When the engine is stopped and the ignition is in the
OFF position, a change in the fuel tank vapor
temperature occurs. This results in a change in the
pressure of the fuel tank vapor space. This change in
pressure is monitored by the control module, using the
fuel tank pressure (FTP) sensor input. The EVAP
diagnostic detects leaks as small as 0.51 mm (0.02 in).
FTP Sensor Signal
Voltage
High, Approximately 1.5
Volts or More
Low, Approximately 1.5
Volts or Less
Conditions for Running the DTC
NOTE
The following conditions must be met prior to
the ignition OFF test.
• DTCs P0100, P0101, P0102, P0103, P0111, P0112,
P0113, P0116, P0117, P0118, P0119, P0125, P0128,
P0443, P0446, P0449, P0451, P0452, P0453, P0458,
P0459, P0496, P0498, P0499, P0560, P0562, P0563,
P0700, P2227, P2228, and P2229 are not set.
• The ignition voltage is more than 10.8 volts.
• A refueling event is not detected
Fuel Tank Pressure
Negative Pressure/
Vacuum
Positive Pressure
• The fuel volatility is not excessive.
• The ambient air temperature (AAT) is between 2-32°C
(35-90°F).
• The intake air temperature (IAT) is between 2-32°C
(35-90°F) at start-up.
• The engine coolant temperature (ECT) is less than
42°C (108°F) at start-up.
• The ECT and the IAT are within 10°C (18°F) of each
other at engine start-up.
• The barometric pressure (BARO) is more than 68
kPa.
• The engine coolant temperature (ECT) during the
previous ignition was more than 74°C (165°F).
• The fuel level is between 12-88 percent.
• The vehicle traveled more than 8 km (5 mi) with
vehicle speed above 2.5 km/h (1.6 mph).
• The engine run time is more than 10 minutes.
• DTC P0442 runs once per engine off cycle when the
above conditions have been met prior to engine shut
down.
Conditions for Setting the DTC
The control module detects approximately 6 vacuum/
pressure changes significantly less than a calibrated
amount.
Action Taken When the DTC Sets
DTC P0442 is a Type A/B DTC.
Conditions for Clearing the DTC
DTC P0442 is a Type A/B DTC.
Diagnostic Aids
• To improve the visibility of the smoke exiting the EVAP
system, observe the suspected leak area from
different angles with the J 41413-SPT High Intensity
White Light.
• To help locate intermittent leaks, use the J 41413-200
Evaporative Emissions System Tester (EEST) to
introduce smoke into the EVAP system. Move all
EVAP components while observing smoke with the J
41413-SPT. Introducing smoke in 15 second intervals
will allow less pressure into the EVAP system. When
the system is less pressurized, the smoke will
sometimes escape in a more condensed manner.
• Observe the Freeze Frame/Failure Records vehicle
mileage since the diagnostic test last failed may help
determine how often the condition occurs that caused
the DTC to set. This may assist in diagnosing the
condition.

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