PROBLEM SYMPTOMS TABLE


warning
  • A high-tension voltage is flowing between the engine-ECU and the injectors while the engine is running. Handle them carefully to avoid receiving electric shocks from the voltage.
warning
  • If the throttle valve is operated, a finger might be injured as the result of being caught by the throttle valve. When touching the throttle valve, surely shut off the driving circuits of the throttle valve.
Trouble symptom
 Inspection procedure
Reference page
Communication with Engine-ECU is Not Possible
 1
Starter System
 2
Engine-ECU Power Supply, Engine Control Relay, Ignition Switch-IG1 System
 3
Intake Air Pressure Sensor System
 4
Air Temperature Sensor System
 5
Intake Air Temperature Sensor System
 6
Air Flow Sensor System
 7
Engine Coolant Temperature Sensor System
 8
Fuel Temperature Sensor System
9
Crank Angle Sensor System
 10
Camshaft Position Sensor System
 11
Accelerator Pedal Position Sensor (main) System
 12
Accelerator Pedal Position Sensor (sub) System
 13
No. 1 Injector System
 14
No. 2 Injector System
 15
No. 3 Injector System
 16
No. 4 Injector System
 17
Variable Geometry Control Motor System
 18
Variable Geometry Position Sensor System
 19
EGR Valve (DC Motor) System
 20
EGR Valve Position Sensor System
 21
EGR Cooler Solenoid Valve System
 22
Alternator System
 23
Glow System
 24
Fuel Pump System
 25
A/C Compressor Relay System
 26
Engine Oil Pressure Switch System
 27
Throttle Valve Control Motor System
 28
Throttle Position Sensor System
 29
Swirl Control Solenoid Valve System
 30
Exhaust Gas Temperature Sensor System
 31
Exhaust Differential Pressure Sensor System
 32
Proportional Oxygen Sensor System
 33
Water In Fuel Sensor System
 34
Fuel Flow Regulator System
 35
High Pressure Fuel Regulator System
 36
Rail Pressure Sensor System
 37
Engine Oil Temperature Sensor System
 38
Engine Oil Level Sensor System
 39
Fuel Additive Pump System
 40

INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
 Probable cause
 Remedy
 Reference page
Engine warning lamp
 The engine warning lamp does not illuminate right after the ignition switch is turned the "ON" position
  • Failed engine warning lamp
  • Check the combination meter

 Refer to GROUP 54A - Combination Meter - Check Chart for Trouble Symptoms

  • Open circuit in combination meter circuit
  • Check the combination meter circuit
Engine warning lamp
 The engine warning lamp remains illuminating and never goes out
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Short circuit in combination meter circuit
  • Check the combination meter

 Refer to GROUP 54A - Combination Meter - Check Chart for Trouble Symptoms

  • Check the combination meter circuit
Starting
 Starting impossible (Starting not possible)
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injection System , , ,

  • Contamination (water, kerosene, etc.) in fuel, and repair if necessary

 -

  • Failed glow system
  • Check the glow system

 Refer to Inspection Procedure - Glow System

  • Failed compression pressure
  • Check the compression pressure

 Refer to GROUP 11G - On-vehicle Service - Compression Pressure Check

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Starting
 Poor start ability when engine is cold (Poor starting)
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to inspection Procedure - Injector System , , ,

  • Contamination (water, kerosene, etc.) in fuel, and repair if necessary

 -

  • Failed glow system
  • Check the glow system

 Refer to Inspection Procedure - Glow System

  • Failed engine oil viscosity
  • Check the engine oil viscosity, and replace if necessary

 -

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Starting
 Poor start ability when engine is both cold and warm (Poor starting)
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to inspection Procedure - Injector System , , ,

  • Contamination (water, kerosene, etc.) in fuel, and repair if necessary

 -

  • Failed compression pressure
  • Check the compression pressure

 Refer to GROUP 11G - On-vehicle Service - Compression Pressure Check

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Idling stability (Improper idling)
 Idle speed is low when engine is cold (Improper idling speed)
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injector System , , ,

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Idling stability (Improper idling)
 Idle speed is high (Improper idling speed)
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Failed fuel system
  • Check the fuel high pressure fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injector System , , ,

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Idling stability (Improper idling)
 Idle speed is low (Improper idling speed)
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injector System , , ,

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Idling stability (Improper idling)
 Idle speed is unstable (Rough idling, hunting)
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injector System , , ,

  • Contamination (water, kerosene, etc.) in fuel, and repair if necessary

 -

  • Failed glow system
  • Check the glow system

 Refer to Inspection Procedure - Glow System

  • Failed EGR system
  • Check the EGR system

 -

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Idling stability (Engine stalls)
 Engine stops soon after starting
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injector System , , ,

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Idling stability (Engine stalls)
 Engine stops during idling
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injector System , , ,

  • Failed EGR system
  • Check the EGR system

 -

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Driving
 Engine output is too low
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injector System , , ,

  • Contamination (water, kerosene, etc.) in fuel, and repair if necessary

-

  • Failed EGR system
  • Check the EGR system

 -

  • Failed turbocharger
  • Check the boost pressure control system and turbocharger, and repair if necessary

 -

  • Failed compression pressure
  • Check the compression pressure

 Refer to GROUP 11G - On-vehicle Service - Compression Pressure Check

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Driving
 Abnormal engine knocking occurs
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injector System , , ,

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Driving
 Abnormally black smoke
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injector System , , ,

  • Failed EGR system
  • Check the EGR system

 -

  • Failed turbocharger
  • Check the boost pressure control system and turbocharger, and repair if necessary

 -

  • Failed air cleaner element
  • Check the air cleaner element, and replace if necessary

 -

  • Catalytic converter or DPF assembly deteriorated
  • Check the catalytic converter, and replace if necessary

 -

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Driving
 Abnormally white smoke
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Oil loss via the piston ring
  • Check the piston ring, and replace if necessary

 -

  • Oil loss via the valve guides
  • Check the valve guides, and replace if necessary

 -

  • Failed engine-ECU
  • Replace the engine-ECU

 -
Driving
 Hunting occurs while driving
  • Failed engine control system
  • Check the output diagnosis code

 Refer to Inspection Chart for Diagnosis Code

  • Check the data list

 Refer to Data List Reference Table

  • Check the actuator test

 Refer to Actuator Test Reference Table

  • Failed fuel system
  • Check the fuel high pressure and fuel supply line, and repair if necessary

 -

  • Check the fuel injector

 Refer to Inspection Procedure - Injector System , , ,

  • Failed EGR system
  • Check the EGR system

 -

  • Failed engine-ECU
  • Replace the engine-ECU

 -