16. TROUBLESHOOTING 16.4.4 APS (Automatic Priming System) 2-91 Problem Main causes Remedy Engine does not start at all. ‡ Nozzle clogging (dust, paraffin precipitation, defective nozzle) ‡ Defective glow plug ‡ Fuel pipe collapse, fuel leak, clogging ‡ Defective wiring ‡ Fuse breaking ‡ Defective APS controller (‡ Clean, change to specified fuel, replace nozzle) (‡ Replace) (‡ Check, repair) (‡ Check, repair) (‡ Replace) (‡ Replace) Engine does start smoothly but much white smoke emits or the engine stop.
‡ Nozzle clogging (dust, paraffin precipitation, defective nozzle) ‡ Defective glow plug ‡ Fuse breaking ‡ Alternator functional defect (Alternator output shortage) ‡ Defective APS water temperature sensor ‡ Defective APS controller (‡ Clean, change to specified fuel, replace nozzle) (‡ Replace) (‡ Replace) (‡ Check, repair or replace) (‡ Replace temperature sensor) (‡ Replace) When loaded, the engine will emit black smoke and stop. ‡ Defective APS water temperature sensor ‡ Deposited heater relay contact point (‡ Replace temperature sensor) (‡ Replace heater relay) Burner is ignited and preheating monitor lamp remaining lighted.
Preheating monitor lamp does not become bright (when the temperature of the engine cooling water exceeds 20°C, the engine preheating system is in normal condition) ‡ Disconnection in electrical intake air heater and glow plug ‡ Defective wiring ‡ Defective timer (‡ Replace) (‡ Check, repair) (‡ Replace) Burner is not ignited ‡ Glow plug is not heated red. ‡ See item “Preheating monitor lamp does not become bright” ‡ Fuel is not or less sprayed. fi Nozzle clogging (dust, paraffin, precipitation, defective nozzle) fi Defective APS controller (fi Clean, change to specified fuel, replace nozzle) (fi Replace)