Suzuki XL7 2007 Service Manual page 279

DTC P2636
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 P2636: Fuel Transfer Pump Flow Insufficient
Circuit Description
The fuel tank on this vehicle is equipped with 2 fuel level
sensors, one for each reservoir of the fuel tank. Fuel is
transferred from the left side of the fuel tank to the right
side of the fuel tank in order to ensure all of the usable
fuel volume is available. The fuel pump supplies a small
amount of pressurized fuel to the siphon jet pump
through the fuel feed pipe. The pressurized fuel creates
a venturi action inside the siphon jet pump. The venturi
action causes the fuel to be drawn out of the left side of
the fuel tank. Fuel is then transferred from the left side of
fuel tank to the right side of fuel tank through the internal
fuel transfer tube. This diagnostic tests for too large of a
difference in fuel level between the left and right side of
the fuel tank. The DTC sets if the control module
determines that the right side fuel level is less than a
predetermined amount of the left side fuel level.
The following table illustrates the difference between
temperature, resistance, and voltage:
Fuel Level
Fuel Level-Right
Sensor
or Left Sensor
Resistance
Empty
Full
Conditions for Running the DTC
• Before the engine control module (ECM) can report
DTC P2636 failed, DTCs P0462, P0463, P2067, and
P2068 must run and pass.
• The engine is operating.
• DTC P2636 runs continuously once the above
conditions exist for more than 4 minutes.
Conditions for Setting the DTC
• The ECM detects that the right side fuel level is less
than 11 percent and the left side fuel level is more
than 23 percent.
• The above condition is present for greater than 4
seconds or for a cumulative of 50 seconds.
Fuel Level
Sensor Voltage
Low Low
High High
Engine General Information and Diagnosis:
Action Taken When the DTC Sets
DTC P2636 is a Type C DTC.
Conditions for Clearing the MIL/DTC
DTC P2636 is a Type C DTC.
Diagnostic Aids
Depending on the current fuel level, it may be difficult to
locate a malfunctioning fuel level sensor. The condition
may only occur when the fuel level is full or near empty.
The fuel level sensor unit may need to be removed for
further diagnosis. A fuel level sensor that has an
intermittent condition causes this DTC to set.
Reference Information
Schematic Reference
"Engine Controls Schematics"
Connector End View Reference
• "Engine Control Module Connector End Views"
• "Engine Controls Connector End Views"
Description and Operation
"Fuel System Description: "
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
Engine idling for 5 minutes, observe the DTC information
with a scan tool. DTC P2636 should not set.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector of
the left side fuel level sensor.
2. Ignition ON, verify the scan tool Fuel Level Sensor-
Left Tank voltage parameter is at 5.0 volts.
➢ If less than the specified range, test the signal
circuit for a short to ground. If the circuit tests
normal, replace the ECM.
1A-174