ECD SYSTEM PROBLEM SYMPTOMS TABLE
Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
| Symptom | Suspected Area | See page |
|---|---|---|
| Engine does not crank (does not start) | Starter | |
| ST relay | ||
| ECT sensor | ||
| Difficult to start with cold engine | Engine difficult to start or stalling | |
| Starter signal circuit | ||
| Injector | ||
| Fuel filter | ||
| Compression | ||
| Supply pump | ||
| Fuel pressure sensor | ||
| Diesel throttle body assembly | ||
| EDU (relay) | ||
| Battery deteriorated | ||
| Fuel with low cetane number used | - | |
| Fuel frozen | - | |
| Air mixed into fuel pipe | - | |
| ECM | ||
| Difficult to start with warm engine | Engine difficult to start or stalling | |
| Starter signal circuit | ||
| Injector | ||
| Fuel filter | ||
| Compression | ||
| Supply pump | ||
| Fuel pressure sensor | ||
| Diesel throttle body assembly | ||
| EDU (relay) | ||
| Air mixed into fuel pipe | - | |
| Battery deteriorated | ||
| ECM | ||
| Engine stalls soon after starting | Engine difficult to start or stalling | |
| Fuel filter | ||
| Injector | ||
| ECM power source circuit | ||
| Supply pump | ||
| Fuel pressure sensor | ||
| Diesel throttle body assembly | ||
| Air mixed into fuel pipe | - | |
| ECM | ||
| Engine stalls (not including the condition listed above) | Engine difficult to start or stalling | |
| Abnormal initial idling (poor idling) | Rough idling or excessive engine vibration | |
| Fuel filter | ||
| Injector | ||
| Supply pump | ||
| Fuel pressure sensor | ||
| Fuel with low cetane number used | - | |
| A/C signal circuit to ECM open and generator signal circuit to ECM open | - | |
| ECM | ||
| High engine idling speed (poor idling) | Rough idling or excessive engine vibration | |
| A/C signal circuit | - | |
| Injector | ||
| Starter signal circuit | ||
| Supply pump | ||
| Fuel pressure sensor | ||
| Speed sensor circuit open | - | |
| Accelerator pedal | ||
| ECM | ||
| Low engine idling speed (poor idling) | Rough idling or excessive engine vibration | |
| A/C signal circuit | - | |
| Injector | ||
| EGR system | ||
| Compression | ||
| Fuel line (air bleeding) | - | |
| Supply pump | ||
| Fuel pressure sensor | ||
| Diesel throttle body | ||
| ECM | ||
| Rough idling (poor idling) | Rough idling or excessive engine vibration | |
| Hunting with hot engine (poor idling) | Injector | |
| ECM power source circuit | ||
| Compression | ||
| Fuel line (air bleeding) | - | |
| Supply pump | ||
| Fuel pressure sensor | ||
| Diesel throttle body | ||
| ECM | ||
| Hunting with cold engine (poor idling) | Injector | |
| ECM power source circuit | ||
| Compression | ||
| Fuel line (air bleeding) | - | |
| Supply pump | ||
| Fuel pressure sensor | ||
| Diesel throttle body | ||
| ECM | ||
| Hesitation/Poor acceleration (poor driveability) | Lack of power or hesitation | |
| Injector | ||
| Fuel filter | ||
| EGR system | ||
| Compression | ||
| Supply pump | ||
| Fuel pressure sensor | ||
| Diesel throttle body assembly | ||
| Accelerator pedal | ||
| Turbocharger system | ||
| ECM | ||
| Knocking (poor driveability) | Engine knocking or rattling | |
| Black smoke emitted (poor driveability) | Black smoke emitted | |
| EGR system | ||
| Injector | ||
| Accumulation in exhaust system | - | |
| White smoke emitted (poor driveability) | EGR system | |
| Injector | ||
| Fuel filter | ||
| Supply pump | ||
| Fuel pressure sensor | ||
| Diesel throttle body | ||
| Low quality fuel | - | |
| ECM | ||
| Surging/Hunting (poor driveability) | Injector | |
| Supply pump | ||
| Fuel pressure sensor | ||
| Turbocharger system (VN turbo system) | ||
| ECM | ||
| DPF switch indicator does not come on while the DPF warning buzzer is sounding | DPF switch and buzzer circuit | |
| ECM | ||
| DPF forcible regeneration does not end | DPF switch and buzzer circuit | |
| Clogging by DPF catalytic converter | ||
| ECM |