312000561 - D012 ENGINE IDLING TOO LOW
The customer complains that: Engine idle speed is too low.| Test results | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
Check:
| Move on to Step 1 | 1. Leaks from the intake manifolds2. Air filter blocked3. Ducts blocked4. Diesel filter blocked5. Leaks from the low pressure circuit | 1. Restore seal for ducts2. Replace air filter Op. 1048A10 AIR FILTER ASSEMBLY - R.R. 3. Repair ducts4. Replace diesel filter Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE 5. Restore the correct seal. | |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and check that there are no errors present in the control unit. | Move on to Step 2 | Presence of errors in control unit | Continue following the instructions on the diagnostic equipment | |
| 2 | EGR VALVE CHECK | All OK | Problems encountered | Operation |
| Check that the EGR solenoid valve is not stuck open.Check that the EGR valve is working properly by carrying out the active diagnosis using the Examiner and checking that the valve does not remain open by carrying outSee Test 1080CB | Move on to Step 3 | 1. Solenoid not working2. Wiring defective | 1. Replace the solenoid valve Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R 2. Check the continuity of the wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | |
| 3 | DIESEL HIGH PRESSURE CHECK | All OK | Problems encountered | Operation |
| Check that the high pressure value is correct by carrying out See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECK | Move on to Step 7 | 1. Leaks from high pressure circuit2. Pressure not correct | 1. Restore the correct seal2. Move on to Step 4 | |
| 4 | DIESEL LOW PRESSURE CHECK | All OK | Problems encountered | Operation |
| Check that the low pressure value is correct by carrying out See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK | Move on to Step 6 | Pressure not correct | Move on to Step 5 | |
| 5 | FUEL PUMP CHECK | All OK | Problems encountered | Operation |
| Using the Examiner check that the fuel pump absorption is correct by carrying outSee Test 1040AA | Move on to Step 6 | Electric pump defective | Replace the electric pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R | |
| 6 | CHECK ON DIESEL PRESSURE SENSOR ON RAIL | All OK | Problems encountered | Operation |
| Check that the pressure sensor on the rail is working properly by carrying out See Test 1060GR FUEL PRESSURE SENSOR ON RAIL OPERATION CHECK | Move on to Step 7 | 1. Sensor wiring defective2. Pressure sensor defective | 1. Restore correct wiring2. Replace the pressure sensor Op. 1060G28 FUEL PRESSURE SENSOR ON FUEL MANIFOLD TO INJECTORS - R.R | |
| 7 | FLOW METER CHECK | All OK | Problems encountered | Operation |
| Check the continuity of the wiring between the engine management control unit and the flow meter.Check that the flow meter is receiving the correct power supply. See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Check that the flow meter signal is correct using the Examiner and carrying out See Test 1060GS FLOW METER OPERATION CHECK | Move on to Step 8 | 1. Air flow meter defective2. Wiring between flow meter and engine management control unit broken.3. Flow meter signal too high | 1. Replace the flow meter Op. 1060G10 AIR FLOW METER - R.R. 2. Restore correct wiring.3. Check the EGR system. Move on to Step 2. | |
| 8 | INJECTOR CHECK | All OK | Problems encountered | Operation |
| Check that the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another by carrying out See Test 1060OC INJECTOR SEAL TESTCheck that the injectors are working properly by connecting to the engine management control unit in active diagnosis | Move on to Step 9 | 1. Injector with leaks/poor atomization.2. Check the continuity of the wiring between the engine management control unit and the injectors. | 1. Replace the injectorOp. 1060F10 2. Restore the correct wiring continuity. | |
| 9 | ENGINE CONTROL UNIT OPERATION CHECK. | All OK | Problems encountered | Operation |
| Replace the engine control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R and check that the fault is no longer present | End of diagnosis | The fault persists | Move on to Step 10 | |
| 10 | CHECK ON CORRECT OPERATION OF HIGH PRESSURE PUMP | All OK | Problems encountered | Operation |
| Replace the high pressure pump Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R. | End of diagnosis | |||