Suzuki XL7 2007 Service Manual page 172

1A-67 Engine General Information and Diagnosis:
Diagnostic Aids
• Inspect the harness of the MAF sensor to verify that it
is not routed too close to the following components:
– The secondary ignition wires or coils
– Any solenoids
– Any relays
– Any motors
• Inspect the hydro-carbon (HC) filter in the air cleaner
assembly for ruptures that would leak charcoal into
the air intake, contaminating the sensing element.
• Inspect for any contamination, water intrusion, or
debris on the sensing elements of the MAF sensor. If
debris is present, clean the sensor. If the sensor
cannot be cleaned, replace the sensor.
• A high resistance may cause a driveability concern
before this DTC sets.
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
"Air Intake 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
1. Engine idling for 1 minute, observe the DTC
information with a scan tool. DTCs P0100, P0102
and P0103 should not set.
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, disconnect the harness connector at
the MAF sensor.
CAUTION
!
Do NOT use the low reference circuit in the
component harness connector for this test.
Damage to the control module may occur due
to excessive current draw.
2. Ignition ON, verify that a test lamp illuminates
between the ignition circuit terminal B and ground.
➢ If the test lamp does not illuminate, test the ignition
circuit for a short to ground or an open/high
resistance. If the circuit tests normal and the
ignition circuit fuse is open, test all the components
connected to the ignition circuit and replace as
necessary.
3. Test for less than 5 ohms between the ground circuit
terminal C and the battery ground.
➢ If greater than the specified value, repair the
ground circuit for an open/high resistance.
4. Test for 4.89-5.10 volts between the signal circuit
terminal A and the ground circuit terminal C.
➢ If less than the specified range, test the signal
circuit for an open/high resistance or a short to
ground. If the circuit/connections test normal,
replace the ECM.
➢ If greater than the specified range, test the signal
circuit for a short to voltage. If the circuit/
connections test normal, replace the ECM.
5. If all circuits/connections test normal, replace the
MAF sensor.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Mass Airflow Sensor/Intake Air Temperature Sensor
Replacement: "
• "Control Module References: " for engine control
module replacement, setup, and programming