Suzuki XL7 2007 Service Manual page 204

1A-99 Engine General Information and Diagnosis:
➢ If the test lamp does not illuminate and the fuse is
OK, repair the ignition voltage circuit for an open/
high resistance between the multi-way connector
and the fuse.
3. Connect a test lamp between the appropriate
injector control circuit, ECM side of the multi-way
harness connector, and B+. The test lamp should not
illuminate.
➢ If the test lamp illuminates, test the control circuit
for a short to ground. If circuit/connections test
normal, replace the ECM.
4. Connect a test lamp between the appropriate
injector control circuit, ECM side of the multi-way
harness connector, and ground. The test lamp
should not illuminate.
➢ If the test lamp illuminates, test the control circuit
for a short to voltage. If circuit/connections test
normal, replace the ECM.
5. Ignition ON, test for 2.6-4.6 volts between the
appropriate injector control circuit, ECM side of the
multi-way connector, and ground.
➢ If the voltage is not within the specified range, test
the control circuit for an open/high resistance. If the
circuit/connections test normal, replace the ECM.
6. Remove the upper intake manifold. Refer to "Upper
Intake Manifold Replacement: ".
7. Disconnect the fuel injector connectors.
8. Test for continuity between the ignition voltage
circuit(s) and the appropriate fuel injector control
circuit, at the fuel injector side of the multi-way
harness connector, the DMM should display OL.
➢ If less than OL repair the short between the ignition
voltage circuit and the control circuit.
9. Test for less than 1 ohm of resistance in the
appropriate ignition voltage circuit, between the
injector connector(s) and the multi-way connector.
➢ If more than 1 ohm repair the open/high resistance
in the ignition voltage circuit.
10. Test for less than 1 ohm of resistance in the
suspected control circuit, between the injector
connector and the multi-way connector.
➢ If more than 1 ohm repair the open/high resistance
in the fuel injector control circuit.
11. Test for continuity between appropriate fuel injector
control circuit and ground. The DMM should display
OL.
➢ If less than OL repair the short to ground in the fuel
injector control circuit.
12. Test for continuity between the suspected fuel
injector control circuit and all the other control
circuits of the fuel injectors. The DMM should display
OL.
➢ If less than OL is measured between any of the
control circuits, repair the wire to wire short
between those circuits.
13. If all circuits/connections test normal, test or replace
the appropriate fuel injector(s).
Component Testing
1. Measure for 12-16 ohms of resistance between the
terminals of the fuel injector.
➢ If the resistance is not within the specified range,
replace the fuel injector.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Fuel Injector and Fuel Rail Replacement: "
• "Control Module References: " for engine control
module replacement, setup, and programming
DTC P0300-P0306
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 Descriptors
DTC P0300: Engine Misfire Detected
DTC P0301: Cylinder 1 Misfire Detected
DTC P0302: Cylinder 2 Misfire Detected
DTC P0303: Cylinder 3 Misfire Detected
DTC P0304: Cylinder 4 Misfire Detected
DTC P0305: Cylinder 5 Misfire Detected
DTC P0306: Cylinder 6 Misfire Detected
Circuit/System Description
The engine control module (ECM) uses information from
the crankshaft position (CKP) sensor and the camshaft
position (CMP) sensors in order to determine when an
engine misfire is occurring. By monitoring variations in
the crankshaft rotation speed for each cylinder, the ECM
is able to detect individual misfire events. A misfire rate
that is high enough can cause 3-way catalytic converter
damage. The malfunction indicator lamp (MIL) will flash
ON and OFF when the conditions for catalytic converter
damage are present. DTCs P0301 through P0306
correspond to cylinders 1 through 6. If the ECM is able to
determine that a specific cylinder is misfiring, the DTC
for that cylinder will set.