Dtc P0303: Cylinder 3 Misfire Detected Malfunction; Dtc P0304: Cylinder 4 Misfire Detected Malfunction - Suzuki GRAND VITARA 2005 Service Manual

DTC P0303: Cylinder 3 Misfire Detected Malfunction

NOTE
• Cylinder number is counted from flywheel side.
• Conditions for applying fault finding procedures to stored faults:
The fault is declared present after the engine is started or following a road test.
• If the fault is present, engine performance is reduced and instability is possible.
• Priority when dealing with a number of faults:
Firstly, deal with fault "DTC P0203: Fuel Injector Circuit / Open Malfunction-Cylinder 3: " if it is
present or stored.
Troubleshooting
Check that the fuel injector No.3 calibration code using SUZUKI scan tool is correctly entered and that it
corresponds to the code inscribed on the corresponding injector.
Enter the code into an fuel injector that has not been programmed or where the code has been entered
incorrectly, if necessary.
Refer to "Registration Procedure for the Fuel Injector Calibration Code: in Section 1C".
Check the engine compression.
Repair if necessary.
Check the valve clearance and adjust if necessary.
In the event of several combustion misfire faults being present, check that the right fuel is being used.
Visually inspect the fuel injector 3 return pipes.
Repair if necessary.
If the fault is still present: apply Test 8 of Fault Finding-Tests referring to "Test 8: Injector malfunction: ".
If the fault is still present, substitute a known-good ECM and recheck.

DTC P0304: Cylinder 4 Misfire Detected Malfunction

NOTE
• Cylinder number is counted from flywheel side.
• Conditions for applying fault finding procedures to stored faults:
The fault is declared present after the engine is started or following a road test.
• If the fault is present, engine performance is reduced and instability is possible.
• Priority when dealing with a number of faults:
Firstly, deal with fault "DTC P0204: Fuel Injector Circuit / Open Malfunction-Cylinder 4: " if it is
present or stored.
Troubleshooting
Check that the fuel injector No.4 calibration code using SUZUKI scan tool is correctly entered and that it
corresponds to the code inscribed on the corresponding injector.
Enter the code into an fuel injector that has not been programmed or where the code has been entered
incorrectly, if necessary.
Refer to "Registration Procedure for the Fuel Injector Calibration Code: in Section 1C".
Check the engine compression.
Repair if necessary.
Check the valve clearance and adjust if necessary.
In the event of several combustion misfire faults being present, check that the right fuel is being used.
Visually inspect the fuel injector 4 return pipes.
Repair if necessary.
If the fault is still present: apply Test 8 of Fault Finding-Tests referring to "Test 8: Injector malfunction: ".
If the fault is still present, substitute a known-good ECM and recheck.
Engine General Information and Diagnosis: 1A-49
S5JB0B1104107
S5JB0B1104108