Suzuki XL7 2007 Service Manual page 253

Diagnostic Aids
• Operating the throttle valve with the Throttle Position
control function of the scan tool may cause additional
DTCs to set. DO NOT attempt to diagnose DTCs set
during this function.
• The scan tool has the ability to operate the throttle
actuator control system using Special Functions. This
function operates the throttle through the entire range
in order to determine if the throttle body and system
operate correctly.
• Inspect for a condition in which the throttle valve may
have been held open.
• Inspect for conditions in which ice may have formed in
the throttle bore.
• The throttle valve is spring loaded to a slightly open
position. The throttle valve should be open
approximately 30 percent. This is referred to as the
rest position. The throttle valve should not be
completely closed, nor should it be open any more
than the specified amount. The throttle valve should
move open and to the closed position without binding
under the normal spring pressure. The throttle should
NOT be free to move open or closed WITHOUT
spring pressure.
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
"Engine Control Module 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)"
Engine General Information and Diagnosis:
Circuit/System Verification
1. Ignition ON, observe the DTC information with a
scan tool. Verify that DTCs P0121, P0122, P0123,
P0221, P0222, P0223, P2100, P2101, or P2119 are
not set.
➢ If any of the above DTCs are also set, refer to
"Diagnostic Trouble Code (DTC) List - Vehicle
Diagnostic Information: " for further diagnosis.
2. Start the engine. Observe the DTC information with a
scan tool for 30 seconds. DTC P1551 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 Data List.
Circuit/System Testing
Ignition OFF, disconnect the air intake duct at the throttle
body and inspect for the following:
• Throttle valve that is NOT in the rest position
• Throttle valve that is binding open or closed
• Throttle valve that is free to move open or closed
WITHOUT spring pressure
➢ If a condition is found, replace the throttle body
assembly.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
"Throttle Body Assembly Replacement: "
1A-148