Suzuki XL7 2007 Service Manual page 916

1J-23 Charging System:
Conditions for Running the DTC
Key ON Test
• No generator, crankshaft position (CKP) sensors, or
camshaft position (CMP) sensor DTCs are set.
• The ignition is in RUN position.
• The engine is not running.
Run Test
• No generator, CKP sensors, CMP sensor DTCs are
set.
• The engine is running.
Conditions for Setting the DTC
• During the key ON test, the ECM detects high voltage
on the generator turn on signal circuit for at least 5
seconds.
• During the RUN test, the ECM detects low voltage on
the generator turn on signal circuit for at least 15
seconds.
Action Taken When the DTC Sets
• The ECM will command the charge indicator and or
warning message to be illuminated on the instrument
panel cluster (IPC) and the driver information center
(DIC), if equipped.
• The ECM will not illuminate the malfunction indicator
lamp (MIL).
• The ECM will store conditions, which were present
when the DTC set as Failure Records data only.
Conditions for Clearing the DTC
• The ECM will command the message OFF after one
trip in which the diagnostic has been run and passed.
• The history DTC will clear after 40 consecutive warm-
up cycles have occurred without a malfunction.
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 Testing
1. Ignition OFF, disconnect the harness connector at
the generator.
2. Ignition ON, test for less than 1 volt between the
generator turn on signal and ground.
➢ If greater than the specified range, test the
generator turn on signal circuit for a short to
voltage. If the circuit tests normal, replace the ECM.
3. Engine Running, test for greater than 3.5 volts
between the generator turn on signal and ground.
➢ If less than the specified range, test the generator
turn on signal circuit for a short to ground, or an
open/high resistance. If the circuit tests normal,
replace the ECM.
4. If circuit tests normal during the Ignition ON / RUN
tests, replace the generator.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
"Control Module References: " for ECM replacement,
setup, and programming
"Generator Replacement"
DTC P0622
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 P0622: Generator F-Terminal Circuit
Circuit/System Description
The engine control module (ECM) uses the generator
field duty cycle signal circuit to monitor the duty cycle of
the generator. The generator field duty cycle signal
circuit connects to high side of the field windings in the
generator. A pulse width modulated (PWM) high side
driver in the voltage regulator turns the field windings ON
and OFF. The ECM uses the PWM signal input to
determine the generator load on the engine. This allows
the ECM to adjust the idle speed to compensate for high
electrical loads. The ECM monitors the status of the
generator field duty cycle signal circuit. When the key is
in the RUN position and the engine is OFF, the ECM
should detect a duty cycle near 0 percent. However,
when the engine is running, the duty cycle should be
between 5-95 percent.