ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-23
Engine Symptom Diagnosis
Perform troubleshooting referring to following table when ECM has detected no DTC and no abnormality has
been found in visual inspection and engine basic inspection previously.
Condition Possible Cause Reference Item
Hard Starting
(Engine cranks OK)
Faulty spark plug “Spark Plugs Inspection” in Section
6F2.
Leaky high-tension cord “High-tension Cords Inspection” in Sec-
tion 6F2.
Loose connection or disconnection of high-
tension cords or lead wires
“High-tension Cords Inspection” in Sec-
tion 6F2.
Faulty ignition coil “Ignition Coil Assembly (Including Igni-
tor) Inspection” in Section 6F2.
Dirty or clogged fuel hose or pipe “Table B-3 Fuel Pressure Check” in this
section.
Malfunctioning fuel pump “Table B-3 Fuel Pressure Check” in this
section.
Air inhaling from intake manifold gasket or
throttle body gasket
Faulty idle air control system “Table B-4 Idle Air Control System
Check” in this section.
Faulty ECT sensor or MAF sensor “ECT Sensor Inspection” or “Mass Air
Flow (MAF) and Intake Air Temperature
(IAT) Sensor Inspection” in Section
6E2.
Faulty ECM
Low compression “Compression Check” in Section 6A1.
Poor spark plug tightening or faulty gasket “Spark Plugs Removal and Installation”
in Section 6F2.
Compression leak from valve seat “Valves and Cylinder Head Inspection”
in Section 6A2.
Sticky valve stem “Valves and Cylinder Head Inspection”
in Section 6A2.
Weak or damaged valve springs “Valves and Cylinder Head Inspection”
in Section 6A2.
Compression leak at cylinder head gasket “Valves and Cylinder Head Inspection”
in Section 6A2.
Sticking or damaged piston ring “Pistons, Piston rings, Connecting
Rods and Cylinders Inspection” in Sec-
tion 6A2.
Worn piston, ring or cylinder “Pistons, Piston rings, Connecting
Rods and Cylinders Inspection” in Sec-
tion 6A2.
Malfunctioning PCV valve “PCV System Inspection” in Section
6E2.
VVT system out of order “Oil Control Valve Inspection” in Section
6E2.
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