Suzuki XL7 2007 Service Manual page 823

Diagnostic Aids
The following conditions may cause the fuel pump fuse
to open:
• The fuse is faulty.
• There is an intermittent short to ground in the supply
voltage circuit of the fuel pump.
• The fuel pump has an intermittent internal condition.
• 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: "
Description and Operation
"Fuel System Description"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
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): "
Special Tools Required
J 43244 Relay Puller Pliers
Circuit/System Verification
1. Ignition ON, command the fuel pump relay ON with a
scan tool. You should hear the fuel pump operate for
3-5 seconds and then turn OFF.
2. If the vehicle passes the Circuit/System Verification
Test, then operate the vehicle within the conditions
for running the DTC. You may also operate the
vehicle within the conditions that are captured in the
Freeze Frame/Failure Records Data List.
Circuit/System Testing
1. Ignition OFF, the fuel pump should not be operating.
➢ If the fuel pump operates continuously, test for a
short to voltage in supply voltage circuit of the fuel
pump. If the circuit/connections test normal, replace
the fuel pump relay.
2. Test the fuel pump fuse. The fuse should not be
open.
➢ If the fuel pump fuse is open, test for a short to
ground in the supply voltage circuit of the fuel
pump. If the circuit/connections test normal, replace
the fuel pump.
3. Ignition OFF, remove the fuel pump relay from the
electrical center.
4. Ignition ON, test for battery voltage between the B+
voltage circuit of the fuel pump relay and ground.
➢ If less than B+, repair the B+ voltage circuit of the
fuel pump relay for an open/high resistance.
5. Connect a 15-amp fused jumper wire between the
B+ circuit of the fuel pump relay and the supply
voltage circuit of the fuel pump. The fuel pump
should operate.
➢ If the fuel pump does not operate, test for the
following conditions:
– An open/high resistance in the supply voltage
circuit of the fuel pump
– An open/high resistance in the ground circuit of
the fuel pump
➢ If the above circuit/connections test normal, replace
the fuel pump.
6. If all circuit/connections test normal, test or replace
the fuel pump relay.
Component Testing
1. Measure for 110-150 ohms of resistance between
terminals 1 and 2 of the fuel pump relay.
➢ If the resistance is not within the specified range,
replace the fuel pump relay.
2. Measure for infinite resistance between the following
terminals of the fuel pump relay:
– 3 and 2
– 3 and 5
– 3 and 1
– 1 and 5
➢ If continuity is detected, replace the fuel pump
relay.
3. Connect a 15 amp fused jumper wire from the
positive terminal of the battery to relay terminal 1.
Connect a jumper wire from the negative terminal of
the battery to relay terminal 2. Measure for less than
2 ohms between terminals 3 and 5 of the relay.
➢ If the resistance measures more than 2 ohms,
replace the fuel pump relay.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Primary Fuel Tank Module Replacement"
• "Relay Replacement (Within an Electrical Center): "
"Relay Replacement (Attached to Wire Harness): "
Fuel System: 1G-23