Engine General Information and Diagnosis: 1A-48
Engine Symptom Diagnosis
S5JB0A1104010
Perform troubleshooting referring to the followings when ECM has detected no DTC and no abnormality has been
found in “Visual Inspection: ” and “Engine Basic Inspection: ”.
Condition
Possible cause
Correction / Reference Item
Hard starting (Engine
cranks OK)
Faulty spark plug
“Spark Plug Inspection: in Section 1H”
Leaky high-tension cord (for M16
engine)
“High-Tension Cord Inspection (For M16
Engine): in Section 1H”
Loose connection or disconnection of
high-tension cord(s) or lead wire(s) (for
M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine): in Section 1H”
Faulty ignition coil
“Ignition Coil Assembly (Including ignitor)
Inspection: in Section 1H”
Dirty or clogged fuel hose or pipe
“Fuel Pressure Check: ”
Malfunctioning fuel pump
“Fuel Pressure Check: ”
Air drawn in through intake manifold
gasket or throttle body gasket
Faulty electric throttle body assembly
“Electric Throttle Body Assembly On-Vehicle
Inspection: in Section 1C”
Faulty accelerator pedal position (APP)
sensor assembly
“Accelerator Pedal Position (APP) Sensor
Assembly Inspection: in Section 1C”
Faulty ECT sensor or MAF sensor
“Engine Coolant Temperature (ECT) Sensor
Inspection: in Section 1C” or “Mass Air Flow
(MAF) and Intake Air Temperature (IAT)
Sensor Inspection: in Section 1C”
Faulty ECM
Low compression
“Compression Check: For M16A Engine with
VVT in Section 1D” or “Compression Check:
For J20 Engine in Section 1D”
Poor spark plug tightening or faulty
gasket
“Spark Plug Removal and Installation: in
Section 1H”
Compression leak from valve seat
“Valves and Valve Guides Inspection: For J20
Engine in Section 1D” or “Valves and Valve
Guides Inspection: For M16A Engine with VVT
in Section 1D”.
Sticky valve stem
“Valves and Valve Guides Inspection: For J20
Engine in Section 1D” or “Valves and Valve
Guides Inspection: For M16A Engine with VVT
in Section 1D”.
Weak or damaged valve springs
“Valve Spring Inspection: For J20 Engine in
Section 1D” or “Valve Spring Inspection: For
M16A Engine with VVT in Section 1D”
Compression leak at cylinder head
gasket
“Cylinder Head Inspection: For J20 Engine in
Section 1D” or “Cylinder Head Inspection: For
M16A Engine with VVT in Section 1D”
Sticking or damaged piston ring
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Cylinders, Pistons
and Piston Rings Inspection: For M16A Engine
with VVT in Section 1D”
Worn piston, ring or cylinder
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Cylinders, Pistons
and Piston Rings Inspection: For M16A Engine
with VVT in Section 1D”
Malfunctioning PCV valve
“PCV Valve Inspection: in Section 1B”
Camshaft position control (VVT) system
out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D”
Faulty EGR system
“EGR System Inspection: in Section 1B”
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