GDI ± Troubleshooting
13A-27
Code No.44 Abnormal combustion Probable cause
Range of check
D While engine is running during lean fuel combustion
Set conditions
D Abnormal engine speed due to mis-firing is detected by the crank angle
sensor
D Malfunction of the ignition coil
D Malfunction of the spark plug
D Malfunction of the EGR valve
D Open circuit or short-circuit in ignition primary
circuit
D Malfunction of the engine-ECU
NG
Repair
NG
Check the harness wire between the ignition coil and the ignition
switch, and repair if necessary.
(2) NG
NG
Repair
NG
Repair
OK
Replace the engine-ECU.
(3) NG
Check the harness wire between the ignition coil and the
earth, and repair if necessary.
NG
Repair
OK
Check for air leaking into the air intake system.
D Damaged intake manifold gasket
D Damaged vacuum hose
D Damaged air intake hose
D Malfunction of the EGR valve
OK
Check the injector system (Refer to P.13A-25, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE No.41)
NG
Check the following items in the order given.
D Spark plugs
D Compression pressure
OK
Check trouble symptom.
NG
Check the harness wire between the engine-ECU and the ignition
coil.
OK
Check trouble symptom.
OK
Check the following connectors:
A-09, A-10, A-11, A-12
OK
Check trouble symptom.
Check the following connector: C-17
OK
Measure at the ignition coil connectors A -09, A-10, A-11, A-12.
D Disconnect the connector, and measure at the harness
side.
(1) Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage
(2) Voltage between 3 and earth (Engine: Cranking)
OK: 0.5 ± 4.0 V
(3) Continuity between 2 and earth
OK: Continuity
(1) NG
Check the following connector: C-72, C-74
Check the ignition coil (Refer to GROUP 16 ± Ignition System).
NG
Replace
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