| TEST RESULTS |
| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check:correct fastening to earth of negative engine wiring lead and negative battery leadcorrect fastening of positive battery terminal and all connected cables See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | Move on to Step 1 | Fastenings slack or oxidized. | Restore the electrical continuity and the correct fastenings of the cables and the connections for the wiring concerned |
| 1 | HEATER PLUGS CONTROL UNIT POWER SUPPLY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the heater plugs control unit is receiving the correct power supplyCheck the condition of the protective fuse | Move on to Step 2 | 1. Supply wiring broken2. The fuse has blown. | 1. Restore wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT 2. Replace the fuse and search for the cause of the problem. |
| 2 | CHECK THE WIRING | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the continuity of the wiring between the engine management control unit and the heater plugs control unit See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | Move on to Step 3 | Wiring broken | Restore correct wiring. |
| 3 | CHECK ON HEATER PLUGS CONTROL UNIT ACTIVATION SIGNAL | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the heater plugs control unit activation signal is correct. | Move on to Step 4 | Signal interrupted at the engine management control unit output | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R and carry out the correct operation renewal procedure |
| 4 | HEATER PLUGS POWER SUPPLY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the heater plugs are receiving the correct power supply | Move on to Step 5 | 1. Wiring between control unit and heater plugs broken2. Heater plugs control unit defective | 1. Restore the correct wiring.2. Replace heater plugs control unit Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R and carry out the correct operation renewal procedure |
| 5 | HEATER PLUGS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| With the engine at ambient temperature, check the operation of each individual heater plug See Test 5520CA GLOW HEATER PLUGS OPERATION CHECK | End of diagnosis | Heater plug defective. | Replace the heater plug Op. 5520C10 HEATER PLUGS - R+R carry out the renewal procedure for correct operation and delete the error in the memory using the Examiner. |