| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
|---|
| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the condition of the air intake duct | Move on to Step | Duct obstructed | Restore operation |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and check:- no faults in the supplementary heater control unit
- parameter plausibility
| Move on to Step | 1. Presence of faults | 1. continue following the instructions for the diagnostic equipment |
| 2. Air intake motor faulty | Move on to Step |
| 3. Spark plug faulty | Move on to Step |
| 4. Fuel pump faulty | Move on to Step |
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Keeping the diagnostic equipment (Examiner or other instruments) connected to the diagnostic socket, check:- the operation of the air intake motor in active diagnosis
| Move on to Step | Operation not correct | Move on to Step |
| 3 | AIR INTAKE MOTOR ELECTRICAL SYSTEM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the condition of the electrical circuit from the additional heater control unit to the air intake motor (Wiring Diagram ) E6020 AIR CONDITIONING | Move on to Step | 1. Connections not correct | 1. Restore the connections (Wiring Diagram ) E6020 AIR CONDITIONING |
| 2. Connections correct, air intake motor not activated | Move on to Step |
| 4 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Keeping the diagnostic equipment (Examiner or other instruments) connected to the diagnostic socket, check:- operation of the air spark plug in active diagnosis
| Move on to Step | Operation not correct | Move on to Step |
| 5 | SPARK PLUG ELECTRICAL SYSTEM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the condition of the electrical circuit from the additional heater control unit to the spark plug (Wiring Diagram ) E6020 AIR CONDITIONING | Move on to Step | 1. Connections not correct | 1. Restore the connections (Wiring Diagram ) E6020 AIR CONDITIONING |
| 2. Connections correct, spark plug not activated | Move on to Step |
| 6 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Keeping the diagnostic equipment (Examiner or other instruments) connected to the diagnostic socket, check:- operation of the fuel pump in active diagnosis
| Move on to Step | Operation not correct | Move on to Step |
| 7 | FUEL PUMP ELECTRICAL SYSTEM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the condition of the electrical circuit from the additional heater control unit to the fuel pump (Wiring Diagram ) E6020 AIR CONDITIONING | Move on to Step | 1. Connections not correct | 1. Restore the connections |
| 2. Connections correct, electric pump not activated | Move on to Step (Wiring Diagram ) E6020 AIR CONDITIONING |
| 8 | ADDITIONAL HEATER ELECTRICAL SYSTEM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the additional heater control unit supply and earth is correct (Wiring Diagram ) E6020 AIR CONDITIONING | Move on to Step | Connections not correct | Restore the connections (Wiring Diagram ) E6020 AIR CONDITIONING |
| 9 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the fault is no longer present | | Fault persists | Replace supplementary heater unit See in Op. 5020M10 independent heater unit - r r |