Suzuki XL7 2007 Service Manual page 284

1A-179 Engine General Information and Diagnosis:
6. Ignition ON, command the fuel pump ON with a scan
tool. The fuel pressure should be between 380-410
kPa (55-60 psi).
➢ If the fuel pressure is not within range, refer to "Fuel
System Diagnosis: ".
7. Verify that the following conditions do not exist:
– Disconnect the MAF sensor. The engine control
module (ECM) will ignore the MAF sensor and
default to the calculated air flow.
➢ If disconnecting the MAF sensor corrects the
condition and the connections are OK, replace the
MAF sensor. Refer to "Mass Airflow Sensor/Intake
Air Temperature Sensor Replacement: ".
– Collapsed air intake duct to the throttle body
– Restricted air filter element
– Spark plugs for being gas or coolant fouled—
Refer to "Spark Plug Inspection: ".
– A skewed engine coolant temperature (ECT)
sensor—Refer to "Temperature Versus
Resistance - Engine Coolant Temperature
Sensor".
– Exhaust system restricted—Refer to "Restricted
Exhaust: ".
– Fuel contamination—Refer to "Alcohol/
Contaminants-in-Fuel Diagnosis (w/o Special
Tool): " "Alcohol/Contaminants-in-Fuel Diagnosis
(w/ Special Tool): ".
– Engine mechanical condition, for example, worn
timing chain and gears, low compression—Refer
to "Symptoms - Engine Mechanical: ".
➢ If you find any of the above conditions, repair as
necessary.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
Inspection/Maintenance (I/M) System Check
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: " provide an overview of each
diagnostic category.
Description
Several states require that a vehicle pass on-board
diagnostic (OBD) system tests and the inspection/
maintenance (I/M) emission inspection in order to renew
license plates. This is accomplished by viewing the I/M
System Status display on a scan tool. Using a scan tool,
the technician can observe the I/M System Status in
order to verify that the vehicle meets the criteria that
complies with the local area requirements.
Conditions for Updating the I/M System Status
Each system requires at least one, and sometimes
several, diagnostic tests. The results of these tests are
reported by a diagnostic trouble code (DTC). A system
monitor is complete when either all of the DTCs
comprising the monitor have Run and Passed, or any
one of the DTCs comprising the monitor have illuminated
the malfunction indicator lamp (MIL). Once all of the
tests are completed, the I/M System Status display will
indicate YES in the Completed column.
For example, when the HO2S Heater Status indicates
YES, either all of the oxygen sensor heater tests have
passed or one of the tests has illuminated the MIL. If the
vehicle has four heated oxygen sensors, either all four
heater circuit tests have passed or one of the heater
circuit tests has illuminated the MIL. The I/M System
Status will indicate NO under the Completed column
when any of the required tests for that system have not
run. The following is a list of conditions that would set the
I/M System Status indicator to NO:
• The vehicle is new from the factory and has not yet
been driven through the necessary drive conditions to
complete the tests.
• The battery has been disconnected or discharged
below operating voltage.
• The control module power or ground has been
interrupted.
• The control module has been reprogrammed.
• The control module DTCs have been cleared as part
of a service procedure.