Suzuki XL7 2007 Service Manual page 185

Circuit/System Description
The throttle body assembly contains 2 throttle position
(TP) sensors. The TP sensors are mounted to the
throttle body assembly and are not serviceable. The TP
sensors provide a signal voltage that changes relative to
throttle blade angle. The engine control module (ECM)
supplies the TP sensors with a common 5-volt reference
circuit, a common low reference circuit, and two
independent signal circuits. The TP sensors have
opposite functionality. TP sensor 1 signal voltage
increases from below 1 volt at idle to above 4 volts at
wide open throttle (WOT). TP sensor 2 signal voltage
decreases from above 4 volts at idle to below 1 volt at
WOT.
Conditions for Running the DTC
P0121
• The ignition voltage is more than 7 volts.
• The TP sensor 1 voltage is between 0.18-4.6 volts.
• DTC P0121 runs continuously once the above
conditions are met.
P0122, P0123, P0222, and P0223
• The ignition is ON, with the engine OFF, or the engine
is operating.
• The ignition voltage is more than 7 volts.
• DTC P0122 runs continuously once the above
conditions are met.
P0221
• The ignition voltage is more than 7 volts.
• The TP sensor 2 voltage is between 0.16-4.9 volts.
• DTC P0221 runs continuously once the above
conditions are met.
Conditions for Setting the DTC
P0121
The TP sensor 1 disagrees more than 6 percent from TP
sensor 2 for greater than 0.14 second, and TP sensor 1
disagrees more than 9 percent from the predicted value
for greater than 0.24 second.
P0122
The ECM detects the TP sensor 1 signal voltage is less
than 0.18 volt for greater than 0.14 second.
P0123
The ECM detects the TP sensor 1 signal voltage is more
than 4.6 volts for greater than 0.14 second.
P0221
The TP sensor 1 disagrees more than 6 percent from TP
sensor 2 for greater than 0.14 second, and TP sensor 2
disagrees more than 9 percent from the predicted value
for greater than 0.24 second.
P0222
The ECM detects the TP sensor 2 signal voltage is less
than 0.16 volt for greater than 0.14 second.
P0223
The ECM detects the TP sensor 2 signal voltage is
greater than 4.9 volts for greater than 0.14 second.
Engine General Information and Diagnosis:
Action Taken When the DTC Sets
• DTCs P0121 and P0221 are Type B DTCs.
• DTCs P0122, P0123, P0222, and P0223 are Type A
DTCs.
Conditions for Clearing the DTC
• DTCs P0121 and P0221 are Type B DTCs.
• DTCs P0122, P0123, P0222, and P0223 are Type A
DTCs.
Diagnostic Aids
If there is a condition with the TP sensors the ECM
defaults to reduced power mode for the entire ignition
cycle, even if the condition is corrected.
Reference Information
Schematic Reference
"Engine Controls Schematics"
Connector End View Reference
• "Engine Control Module Connector End Views"
• "Engine Controls Connector End Views"
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)"
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