Fuel Injector Solenoid Coil Test - Suzuki XL7 2007 Service Manual

Circuit/System Testing
1. Ignition ON, command the fuel pump relay ON with a
scan tool and observe the fuel pressure while the
fuel pump is operating. Verify the fuel pressure is
between 380-410 kPa (55-60 psi).
➢ If the fuel pressure is more than the specified
range, replace the fuel pump.
➢ If the fuel pressure is less than the specified range,
remove the fuel tank and test/inspect for the
following:
– Restricted fuel feed pipe
– Restricted or plugged fuel filter
– Restricted or plugged strainer
– Stuck or binding fuel level float
– Restricted siphon jet pump
– Restricted transfer lines between fuel tanks
– Faulty fuel pressure regulator
– Poor connections at the harness connectors and
ground circuits of the fuel pump
➢ If you find a condition, repair as necessary.
➢ If all components test normal, replace the fuel
pump.
NOTE
The fuel pressure may vary slightly when the
fuel pump stops operating. After the fuel
pump stops operating, the fuel pressure
should stabilize and remain constant.
2. Verify that the fuel pressure does not decrease more
than 34 kPa (5 psi) in 1 minute.
➢ If the fuel pressure decreases more than the
specified value, perform the following procedure:
a. Ignition OFF, relieve the fuel pressure. Refer to
"Fuel Pressure Relief (With J 34730-1A)" "Fuel
Pressure Relief (Without J 34730-1A)".
b. Install the J 37287 between the fuel feed pipe
and the fuel rail.
c. Open the valve on the J 37287.
d. Bleed the air from the fuel pressure gage.
e. Close the valve on the J 37287.
f. Verify that the fuel pressure does not decrease
more than 34 kPa (5 psi) in 1 minute.
➢ If the fuel pressure remains constant, replace the
fuel pump.
➢ If the fuel pressure drops, locate and replace the
leaking fuel injector.
3. Relieve the fuel pressure to 69 kPa (10 psi). Verify
that the fuel pressure does not decrease more than
14 kPa (2 psi) in 5 minutes.
➢ If the fuel pressure decreases more than the
specified value, replace the fuel pump.
4. Remove the J 37287 and J 34730-1A. Refer to "Fuel
Pressure Gage Installation and Removal".
5. Operate the vehicle within the conditions of the
customer concern while monitoring fuel related
parameters with a scan tool.
➢ If the scan tool parameters indicate a lean
condition, test/inspect for the following:
– Restricted fuel feed pipe
– Restricted fuel filter
– Restricted siphon jet pump
– Restricted transfer lines between fuel tanks
– Faulty fuel pressure regulator
– Poor connections at the harness connectors and
ground circuits of the fuel pump
➢ If all components test normal and the scan tool
parameters indicate a lean condition, replace the
fuel pump.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Primary Fuel Tank Module Replacement"
• "Fuel Injector and Fuel Rail Replacement"

Fuel Injector Solenoid Coil Test

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.
Circuit/System Description
The control module enables the appropriate fuel injector
pulse for each cylinder. The ignition voltage is supplied
directly to the fuel injectors. The control module controls
each fuel injector by grounding the control circuit via a
solid state device called a driver. A fuel injector coil
winding resistance that is too high or too low will affect
the engine driveability. A fuel injector control circuit DTC
may not set, but a misfire may be apparent. The fuel
injector coil windings are affected by temperature. The
resistance of the fuel injector coil windings will increase
as the temperature of the fuel injector increases.
Fuel System: 1G-25