Tech Tips
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, 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.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| Engine does not crank (does not start) | Battery | - |
| Starter (except cold area) | ||
| Starter (for cold area) | ||
| Starter relay assembly | ||
| Clutch start switch assembly | ||
| Engine difficult to start or stalling | ||
| Entry and start system (for start function) (w/ entry and start system) | ||
| Starter signal circuit (w/o entry and start system) | ||
| Difficult to start with cold engine | Immobiliser circuit (w/o entry and start system) | |
| Engine difficult to start or stalling | ||
| Cranking holding function circuit (w/ entry and start system) | ||
| Starter signal circuit (w/o entry and start system) | ||
| Pre-heating control circuit | ||
| Injector assembly | ||
| Fuel filter | - | |
| Compression | ||
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Diesel throttle body assembly | ||
| Low fuel tank level | - | |
| Fuel line (air bleeding) | ||
| VC output circuit | ||
| Fuel with low cetane number used | - | |
| Fuel frozen | ||
| ECM | ||
| Difficult to start with hot engine | Engine difficult to start or stalling | |
| Cranking holding function circuit (w/ entry and start system) | ||
| Starter signal circuit (w/o entry and start system) | ||
| Injector assembly | ||
| Fuel filter | - | |
| Compression | ||
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Diesel throttle body assembly | ||
| Low fuel tank level | - | |
| Fuel line (air bleeding) | ||
| VC output circuit | ||
| Battery deteriorated | - | |
| ECM | ||
| Engine stalls soon after starting | Engine difficult to start or stalling | |
| Fuel filter | - | |
| Injector assembly | ||
| ECM power source circuit | ||
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Diesel throttle body assembly | ||
| Pressure control valve (common rail assembly) | ||
| Fuel line (air bleeding) | ||
| ECM | ||
| Engine stalls (other than the conditions listed above) | Engine difficult to start or stalling | |
| Abnormal initial idling (poor idling) | Rough idling or excessive engine vibrations | |
| Fuel filter | - | |
| Injector assembly | ||
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Pressure control valve (common rail assembly) | ||
| Engine coolant temperature sensor | ||
| Fuel with low cetane number used | - | |
| A/C signal circuit | - | |
| ECM | ||
| High engine idling speed (poor idling) | Rough idling or excessive engine vibrations | |
| A/C signal circuit | - | |
| Injector assembly | ||
| Cranking holding function circuit (w/ entry and start system) | ||
| Starter signal circuit (w/o entry and start system) | ||
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Pressure control valve (common rail assembly) | ||
| Engine coolant temperature sensor | ||
| ECM | ||
| Low engine idling speed (poor idling) | Rough idling or excessive engine vibrations | |
| A/C signal circuit | - | |
| Injector assembly | ||
| EGR system | ||
| Compression | ||
| Valve clearance | ||
| Fuel line (air bleeding) | ||
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Diesel throttle body assembly | ||
| Pressure control valve (common rail assembly) | ||
| Engine coolant temperature sensor | ||
| ECM | ||
| Rough idling (poor idling) | Rough idling or excessive engine vibrations | |
| Hunting with hot engine (poor idling) | Injector assembly | |
| ECM power source circuit | ||
| Compression | ||
| Fuel line (air bleeding) | ||
| Valve clearance | ||
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Diesel throttle body assembly | ||
| Pressure control valve (common rail assembly) | ||
| Engine coolant temperature sensor | ||
| ECM | ||
| Hunting with cold engine (poor idling) | Injector assembly | |
| ECM power source circuit | ||
| Compression | ||
| Fuel line (air bleeding) | ||
| Valve clearance | ||
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Diesel throttle body assembly | ||
| Pressure control valve (common rail assembly) | ||
| Engine coolant temperature sensor | ||
| Fuel with low cetane number used | - | |
| ECM | ||
| Hesitation/Poor acceleration (poor driveability) | Lack of power or hesitation | |
| Injector assembly | ||
| Fuel filter | - | |
| Nozzle leakage pipe assembly | - | |
| EGR system | ||
| Compression | ||
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Diesel throttle body assembly | ||
| Pressure control valve (common rail assembly) | ||
| Turbocharger system | ||
| Diesel turbo pressure sensor | ||
| ECM | ||
| Knocking (poor driveability) | Engine knocking or rattling | |
| Black smoke emitted (poor driveability) | Black smoke emitted | |
| Injector assembly | ||
| EGR system | ||
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Diesel throttle body assembly | ||
| Pressure control valve (common rail assembly) | ||
| Mass air flow meter | ||
| Diesel turbo pressure sensor | ||
| ECM | ||
| White smoke emitted (poor driveability) | EGR system | |
| Injector assembly | ||
| Fuel filter | - | |
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Diesel throttle body assembly | ||
| Pressure control valve (common rail assembly) | ||
| Turbocharger system | ||
| ECM | ||
| Surging/Hunting (poor driveability) | Injector assembly | |
| Supply pump assembly | ||
| Fuel pressure sensor (common rail assembly) | ||
| Pressure control valve (common rail assembly) | ||
| Fuel filter | - | |
| Turbocharger system | ||
| Vehicle speed sensor | - | |
| Clutch start switch assembly | ||
| ECM |