Category Archives: FUSO 4M4

• Diagnosis codes shown by the Multi-Use Tester and those indicated by flashing of the warning lamp are different.  

•Before measuring voltage, check the battery for charged condition and specific gravity. If system inspection is performed with the battery uncharged or reduced in specific gravity, accurate measurements cannot be achieved. • Before disconnecting battery cables, harnesses and connectors, set the starter switch to LOCK or OFF, then allow at least 20 seconds. • To… Read More »

• Perform the inspection in accordance with the following flowchart.

• The engine is electronically controlled by the engine electronic control unit (ECU). • By processing accelerator pedal position data from the accelerator position sensor, the engine electronic control unit controls the injectors for optimum fuel injection.  

• The sensors and other components are continuously monitored for faults. In the event that a component is found faulty, an indication is made in the meter cluster to alert the driver, the fault location is memorized in the form of a diagnosis code, and the control during fault is initiated. • While the control… Read More »

• The vehicle identification number (VIN) registration function is used to have the VIN of the vehicle registered when a new engine electronic control unit is installed or the existing one is replaced. (For the VIN registration method, see “ON-VEHICLE INSPECTION AND ADJUSTMENT”.)  

• The idle-up function increases the engine idling speed when a load is applied to the engine by other system (such as air conditioner) or when the warm-up acceleration function are activated. Also, in the case of variable geometry turbocharger-equipped vehicles, idling speed can be increased with the lighting switch turned on as well.

• The auxiliary brake function activates or deactivates the exhaust shutter 3-way magnetic valve according to the vehicle condition to control the exhaust brake.