Suzuki XL7 2007 Service Manual page 269

DTC P2227, P2228, or P2229
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.
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: " provides an overview of
each diagnostic category.
DTC Descriptors
DTC P2227: Barometric Pressure (BARO) Sensor
Performance
DTC P2228: Barometric Pressure (BARO) Sensor
Circuit Low Voltage
DTC P2229: Barometric Pressure (BARO) Sensor
Circuit High Voltage
Circuit/System Description
The barometric pressure (BARO) sensor responds to
changes in altitude and atmospheric conditions. This
gives the engine control module (ECM) an indication of
barometric pressure. The ECM uses this information to
calculate fuel delivery. The BARO sensor is located
within the controller and is not serviced as a separate
unit. The BARO sensor provides a voltage signal to the
ECM relative to the atmospheric pressure changes. The
ECM monitors the BARO sensor signal for a voltage
outside of the normal range.
Conditions for Running the DTC
P2227
• Before the ECM can report DTC P2227 failed, DTCs
P0100, P0101, P0102, P0103, P0121, P0122, P0123,
P0221, P0222, P0223, P2228, and P2229 must run
and pass.
• The engine is operating for more than 20 seconds.
• The mass air flow is more than 11 g/s.
• The difference between the calculated manifold
absolute pressure (MAP) and BARO pressure is less
than 1.0 kPa for more than 3 seconds.
• The evaporative emission (EVAP) leak test is not
enabled.
• DTC P2227 runs continuously once the above
conditions are met for 2 seconds.
P2228 or P2229
• The engine is operating.
• The DTCs run continuously once the above conditions
are met for 2 seconds.
Engine General Information and Diagnosis:
Conditions for Setting the DTC
P2227
• The ECM detects that the BARO pressure is less than
50 kPa or greater than 115 kPa.
• The ECM detects that the BARO pressure changed
more than 5 kPa within 20 seconds.
• The ECM detects that the BARO pressure changed
more than 30 kPa since the last ignition cycle.
• Any of the condition above exist for 4 seconds or for a
cumulative of 50 seconds.
P2228
The ECM detects that the BARO sensor voltage is less
than 0.20 volt for 4 seconds or for a cumulative of 50
seconds.
P2229
The ECM detects that the BARO sensor voltage is more
than 4.8 volts for 4 seconds or for a cumulative of 50
seconds.
Action Taken When the DTC Sets
DTCs P2227, P2228, and P2229 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P2227, P2228, and P2229 are Type B DTCs.
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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