1A-55 Engine General Information and Diagnosis:
Improper engine idling or
engine fails to idle
Faulty spark plug
“Spark Plug Inspection: in Section 1H”
Leaky or disconnected high-tension cord
(for M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine): in Section 1H”
Faulty ignition coil with ignitor
“Ignition Coil Assembly (Including ignitor)
Inspection: in Section 1H”
Fuel pressure out of specification
“Fuel Pressure Check: ”
Leaky manifold, throttle body, or cylinder
head gasket
Malfunctioning EGR valve
“EGR Valve Inspection: in Section 1B”
Faulty evaporative emission control
system
“EVAP Canister Purge Inspection: in Section
1B”
Faulty EGR system
“EGR System Inspection: in Section 1B”
Faulty fuel injector(s)
“Fuel Injector Circuit Check: ”
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 ECM
Loose connection or disconnection of
vacuum hoses
Malfunctioning PCV valve
“PCV Valve Inspection: in Section 1B”
Engine overheating
Condition “Engine overheating”
Low compression
“Compression Check: For J20 Engine in
Section 1D” or “Compression Check: For
M16A Engine with VVT in Section 1D”
Camshaft position control (VVT) system
out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D”
Faulty electric load parts (headlight,
blower motor and/or rear defogger)
“Electric Load Signal Circuit Check: ”
Faulty electric load current sensor (for
J20 engine)
“Electric Load Current Sensor On-Vehicle
Inspection (For J20 Engine): in Section 1C”
Faulty generator and/or its circuit
“DTC P0620: Generator Control Circuit: ” and
“DTC P0625 / P0626: Generator Field
Terminal Circuit Low / High: ”
Condition
Possible cause
Correction / Reference Item
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