Dtc P0449, P0498, Or P0499 - Suzuki XL7 2007 Service Manual

1A-117 Engine General Information and Diagnosis:

DTC P0449, P0498, or P0499

Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• Review "Strategy Based Diagnosis: " for an overview of the diagnostic approach.
• The "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: " provide an overview of each diagnostic
category.
DTC Descriptors
DTC P0449: Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit
DTC P0498: Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit Low Voltage
DTC P0499: Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit High Voltage
Diagnostic Fault Information
Circuit
Ignition Voltage
EVAP Canister Vent Solenoid Valve Control
Circuit
Circuit/System Description
The evaporative emission (EVAP) canister vent valve is
used for EVAP system diagnostics. The EVAP canister
vent valve is a normally open valve. Battery positive
voltage is supplied directly to the EVAP canister vent
valve. The engine control module (ECM) controls the
solenoid by grounding the control circuit with a solid
state device called a driver. The driver is equipped with a
feedback circuit that is pulled-up to a voltage. The ECM
can determine if the control circuit is open, shorted to
ground, or shorted to a voltage by monitoring the
feedback voltage.
Conditions for Running the DTC
• Before the ECM can report DTC P0449, P0498, or
P0499 failed, DTC P0451 must run and pass.
• The engine speed is more than 80 RPM.
• The ignition voltage is between 10-18 volts.
• The ECM has commanded the EVAP canister vent
valve ON and OFF at least once during the ignition
cycle.
• The DTCs run continuously once the above conditions
are met.
Short to Open/High
Ground Resistance
P0498 P0449
P0498 P0449
Conditions for Setting the DTC
DTC P0449
The ECM detects the voltage on the EVAP canister vent
valve control circuit is between 2.6-4.6 volts when the
driver is commanded OFF. The condition exists for 4
seconds or a cumulative of 50 seconds.
DTC P0498
The ECM detects the voltage on the EVAP canister vent
valve control circuit is less than 2.6 volts when the driver
is commanded OFF. The condition exists for 4 seconds
or a cumulative of 50 seconds.
DTC P0499
The ECM detects the voltage on the EVAP canister vent
valve control circuit is more than 4.6 volts when the
driver is commanded ON. The condition exists for 4
seconds or a cumulative of 50 seconds.
Action Taken When the DTC Sets
• DTC P0449, P0498 and P0499 are Type B DTCs.
• The EVAP system will only purge during open loop.
Conditions for Clearing the DTC
DTC P0449, P0498 and P0499 are Type B DTCs.
Signal
Short to Voltage
Performance
—
P0499
—
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