Suzuki XL7 2007 Service Manual page 915

DTC B1527
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 Descriptor
DTC B1527: High Parasitic Load Detected
Circuit/System Description
The body control module (BCM) monitors the state of
charge (SOC) of the electrical system. If the BCM
senses that the SOC at key-on is 30 percent lower than
what it was when the engine was running, DTC B1527
will set.
Conditions for Running the DTC
The ignition must be in Accessory or Run mode for this
code to set.
Conditions for Setting the DTC
The SOC at key-on is 30 percent lower than when the
engine was running and battery drain is more than 2
amps.
Action Taken When the DTC Sets
There is no battery telltale illuminated or DIC message
displayed.
Conditions for Clearing the DTC
• The DTC will clear if the fault does not return after 50
consecutive ignition cycles.
• The DTC will clear when run SOC is greater than or
equal to 80 percent.
Reference Information
Schematic Reference
"Starting and Charging Schematics: "
Connector End View Reference
"Engine Electrical Connector End Views: "
Description and Operation
"Charging System Description and Operation"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Scan Tool Reference
• "Scan Tool Data List - Engine Electrical: "
• "Scan Tool Data Definitions - Engine Controls - 3.6L
(LY7): "
Circuit/System Verification
Ignition ON, compare the scan tool Prev. State of Charge
and Start Up State of Charge parameters. The readings
should not differ by more than 30%.
➢ If the readings differ by more than 30%, refer to
"Battery Electrical Drain/Parasitic Load Test".
DTC P0621
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 Descriptor
DTC P0621: Generator L-Terminal Circuit
Circuit/System Description
The engine control module (ECM) uses the generator
turn on signal circuit to control the load of the generator
on the engine. A high side driver in the ECM applies a
voltage to the voltage regulator. This signals the voltage
regulator to turn the field circuit ON and OFF. The ECM
monitors the state of the generator turn on signal circuit.
The ECM should detect low voltage on generator turn on
signal circuit when the ignition is ON and the engine is
OFF, or when the charging system malfunctions. With
the engine running, the ECM should detect high voltage
on the generator turn on signal circuit. The ECM
performs key ON and RUN tests to determine the status
of the generator turn on signal circuit.
Charging System: 1J-22