Suzuki XL7 2007 Service Manual page 238

1A-133 Engine General Information and Diagnosis:
Circuit/System Description
The engine control module (ECM) provides ignition
voltage to the coil side of the fuel pump relay whenever
the engine is cranking or running. The control module
enables the fuel pump relay as long as the engine is
cranking or running, and ignition system reference
pulses are received. If no ignition system reference
pulses are received, the control module turns OFF the
fuel pump. The fuel pump relay control circuit is
equipped with a feedback circuit that is pulled up to 2.5
volts within the ECM. The ECM can determine if the
control circuit is open, shorted to ground, or shorted to a
voltage by monitoring the feedback voltage.
Conditions for Running the DTC
• The engine speed is greater than 80 RPM.
• The ignition voltage is 10-18 volts.
• The ECM has commanded the fuel pump relay ON
and OFF at least once during the ignition cycle.
• The above conditions are met for less than 1 second.
• The DTCs runs continuously once the above
conditions are met.
Conditions for Setting the DTC
P0627
The ECM detects the voltage on the fuel pump relay
control circuit is within a predetermined range when the
control circuit is commanded OFF. The condition exists
for a cumulative of 50 seconds.
P0628
The ECM detects the fuel pump relay control circuit
voltage is less than 2.21 volts when the control circuit is
commanded OFF. The condition exists for a cumulative
of 50 seconds.
P0629
The ECM detects the fuel pump relay control circuit
voltage is greater than 2.74 volts when the control circuit
is commanded ON. The condition exists for a cumulative
of 50 seconds.
Action Taken When the DTC Sets
DTCs P0627 and P0628 are Type C DTCs.
DTC P0629 is a type B DTC.
Conditions for Clearing the DTC
DTCs P0627 and P0628 are Type C DTCs.
DTC P0629 is a type B DTC.
Diagnostic Aids
If the condition is intermittent, move the related
harnesses and connectors, with the engine operating,
while monitoring the circuit status for the component with
a scan tool. The circuit status parameter changes from
OK or Indeterminate to Fault if there is a condition with
the circuit or a connection.
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)"
Circuit/System Verification
Ignition ON, command the Fuel Pump Relay ON and
OFF with a scan tool. You should hear or feel a click
from the fuel pump relay. Repeat as necessary in order
to verify fuel pump relay operation.