When the malfunction code is not confirmed the DTC check and problem still can not be confirmed in the basic inspection,then proceed to this step and perform troubleshooting according to the numbered order given in the table below.
Symptom
•Does not crank (Difficult to start)
Suspect area:
Starter
Starter relay
Water temp. sensor
•Difficult to start at cold engine
Suspect area:
STA signal circuit
Injector
Fuel filter
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•Difficult to start at hot engine
Suspect area:
STA signal circuit
Injector
Fuel filter
Compression pressure
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•Engine stall soon after starting
Suspect area:
Fuel filter
Injector
ECU power source circuit
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•Others (Engine stall)
Suspect area:
ECU power source circuit
Injector
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•Incorrect first idle (Poor idling)
Suspect area:
Fuel filter
Injector
Engine ECU
Supply pump
Fuel pressure sensor
•High engine idle speed (Poor idling)
Suspect area:
A/C signal circuit
Injector
STA signal circuit
Engine ECU
Supply pump
Fuel pressure sensor
•Lower engine idle speed (Poor idling)
Suspect area:
A/C signal circuit
Injector
EGR control circuit
Compression pressure
Valve clearance
Fuel line (Air bleed)
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•Rough idling (Poor idling)
Suspect area:
Injector
Fuel line (Air bleed)
EGR control circuit
Compression pressure
Valve clearance
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•Hunting at hot engine (Poor idling)
Suspect area:
Injector
ECU power source circuit
Compression pressure
Fuel line (Air bleed)
Valve clearance
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•Hunting at cold engine (Poor idling)
Suspect area:
Injector
ECU power source circuit
Compression pressure
Fuel line (Air bleed)
Valve clearance
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•Hesitation/Poor acceleration (Poor drivability)
Suspect area:
Injector
Fuel filter
EGR control circuit
Compression pressure
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•Knocking (Poor drivability)
Suspect area:
Injector
EGR control circuit
Engine ECU
Supply pump
Fuel pressure sensor
•Black smoke (Poor drivability)
Suspect area:
Injector
EGR control circuit
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•White smoke (Poor drivability)
Suspect area:
EGR control circuit
Injector
Fuel filter
Engine ECU
Supply pump
Fuel pressure sensor
Diesel throttle
•Surging/Hunting (Poor drivability)
Suspect area:
Injector
Engine ECU
Supply pump
Fuel pressure sensor