1A
Poor gasoline mileage
Perform troubleshooting referring to the followings when ECM has detected no DTC and no abnormality has been found in Visual Inspection:M13A with VVT and Engine Basic Inspection:M13A with VVT .
Condition Possible Cause Action
Poor gasoline mileage
Leaks or loose connection of high-tension cord
High-Tension Cord Inspection:M13A
Faulty spark plug (improper gap, heavy deposits and burned electrodes, etc.)
Spark Plug Inspection:M13A
Malfunctioning EGR valve
EGR System Inspection (If Equipped):M13A
High idle speed
“Improper Engine Idling or Engine Fails to Idle” under Engine Symptom Diagnosis:M13A with VVT
Poor performance of TP sensor, ECT sensor or MAF sensor
Throttle Position (TP) Sensor On-Vehicle Inspection:M13A , Engine Coolant Temperature (ECT) Sensor Inspection:M13A or Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor Inspection:M13A
Faulty fuel injector(s)
Fuel Injector Circuit Check:M13A with VVT
Faulty ECM
Low Compression
“Low Compression” under Engine Symptom Diagnosis:M13A with VVT
Poor valve seating
Valves and Valve Guides Inspection:M13A
Dragging brakes
Brakes Symptom Diagnosis
Slipping clutch
Clutch System Symptom Diagnosis:M13A Model
Thermostat out of order
Thermostat Inspection:M13A
Improper tire pressure
“Replacement Tires” under Tires Description
Camshaft position control (VVT) system out of order
Oil Control Valve Inspection (For Engine with VVT):M13A