Suzuki XL7 2007 Service Manual page 223

Reference Information
Schematic Reference
"Engine Controls Schematics"
Connector End View Reference
• "Engine Control Module Connector End Views"
• "Engine Controls Connector End Views"
Description and Operation
"Evaporative Emission Control System Description: "
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
DTC Type Reference
"Powertrain Diagnostic Trouble Code (DTC) Type
Definitions"
Scan Tool Reference
• "Scan Tool Data List - Engine Controls - 3.6L (LY7)"
• "Scan Tool Data Definitions - Engine Controls - 3.6L
(LY7)"
• "Scan Tool Output Controls - Engine Controls - 3.6L
(LY7)"
Circuit/System Verification
1. Command the EVAP vent solenoid valve ON and
OFF with the scan tool. An audible click should be
heard when changing between the commanded
states.
2. Start the engine, observe the DTC information with a
scan tool. DTCs P0449, P0498, or P0499 should not
set.
3. If the vehicle passes the Circuit/System Verification
test, then operate the vehicle within the conditions
for running the DTC. You may also operate the
vehicle within the conditions that are captured in the
Freeze Frame/Failure Records List.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at
the EVAP vent solenoid valve.
NOTE
The ignition circuit supplies voltage to other
components. Make sure you test all circuits
for a short to ground or test all components
for being shorted that share the ignition
circuit.
Engine General Information and Diagnosis:
2. Ignition ON, verify that a test lamp illuminates
between the ignition voltage circuit terminal A and
ground.
➢ If the test lamp does not illuminate, test the ignition
voltage circuit for a short to ground or an open/high
resistance. If the circuit tests normal and the
ignition voltage circuit fuse is open, test all
components connected to the ignition voltage
circuit and replace as necessary.
3. Ignition OFF, connect a test lamp between the
control circuit terminal B and the ignition voltage
circuit terminal A.
NOTE
The control circuit for the EVAP vent
solenoid valve is pulled-up to voltage within
the ECM, 2.6-4.6 volts on the control circuit is
normal.
4. Ignition ON, use a scan tool to command the EVAP
vent solenoid valve ON and OFF. The test lamp
should turn ON and OFF.
➢ If the test lamp remains ON all the time, test for a
short to ground on the control circuit. If circuit/
connections test normal, replace the ECM.
➢ If the test lamp remains OFF all the time, test for a
short to voltage or an open/high resistance on the
control circuit. If circuit/connections test normal,
replace the ECM.
5. Test for 2.6-4.6 volts between the control circuit
terminal B and ground.
➢ If the voltage is not within the specified range,
replace the ECM.
6. If all circuits/connections test normal, test or replace
the EVAP vent solenoid valve.
Component Testing
1. Measure for 20-24 ohms of resistance between the
terminals of the EVAP vent solenoid valve.
➢ If the resistance is not within the specified range,
replace the EVAP vent solenoid valve.
2. Test for infinite resistance between each terminal of
the EVAP vent solenoid valve and the EVAP vent
solenoid valve housing.
➢ If less than infinite resistance, replace the EVAP
vent solenoid valve.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Evaporative Emission Canister Vent Solenoid Valve
Replacement: "
• "Control Module References: " for ECM replacement,
setup, and programming
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