1A-51 Engine General Information and Diagnosis:
Engine overheating
Inoperative thermostat
“Thermostat Inspection: in Section 1F”
Poor water pump performance
“Water Pump Inspection: in Section 1F”
Clogged or leaky radiator
“Radiator On-Vehicle Inspection and Cleaning:
in Section 1F”
Improper engine oil grade
“Engine Oil and Filter Change: in Section 0B”
Clogged oil filter or oil strainer
“Oil Pressure Check: For J20 Engine in
Section 1E” or “Oil Pressure Check: For M16A
Engine with VVT in Section 1E”
Poor oil pump performance
“Oil Pressure Check: For J20 Engine in
Section 1E” or “Oil Pressure Check: For M16A
Engine with VVT in Section 1E”
Faulty radiator cooling fan control
system
“Radiator Cooling Fan Low Speed Control
System Check: ” or “Radiator Cooling Fan
High Speed Control System Check: ”
Dragging brakes
Condition “Dragging brakes” in “Brakes
Symptom Diagnosis: in Section 4A”
Slipping clutch (for M/T model)
Condition “Slipping clutch” in “Clutch
(Hydraulic Type) Symptom Diagnosis: in
Section 5C”
Blown cylinder head gasket
“Cylinder Head Inspection: For J20 Engine in
Section 1D” or “Cylinder Head Inspection: For
M16A Engine with VVT in Section 1D”
Air mixed in cooling system
Poor gasoline mileage
Leaks or loose connection of high-
tension cord (for M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine): in Section 1H”
Faulty spark plug (improper gap, heavy
deposits and burned electrodes, etc.)
“Spark Plug Inspection: in Section 1H”
Malfunctioning EGR valve
“EGR Valve Inspection: in Section 1B”
High idle speed
Condition “Improper engine idling or engine
fails to idle”
Poor performance of 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 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 fuel injector(s)
“Fuel Injector Circuit Check: ”
Faulty ECM
Low compression
“Compression Check: For J20 Engine in
Section 1D” or “Compression Check: For
M16A Engine with VVT in Section 1D”
Poor valve seating
“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”
Dragging brakes
Condition “Dragging brakes” in “Brakes
Symptom Diagnosis: in Section 4A”
Slipping clutch (for M/T model)
Condition “Slipping clutch” in “Clutch
(Hydraulic Type) Symptom Diagnosis: in
Section 5C”
Thermostat out of order
“Thermostat Inspection: in Section 1F”
Improper tire pressure
“Tires Description: in Section 2D”
Camshaft position control (VVT) system
out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D”
Condition
Possible cause
Correction / Reference Item
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