Flow chart
67: channel D4 of connector CM1
88: channel J1 of connector CM1
| 1320 | engine ECU |
|---|---|
| BSI | built-in systems interface |
| 1150 | pre-post heat box |
| 1160 | pre-heater plugs |
| 0004 | instrument panel |
| no. of link | signal | nature of signal |
|---|---|---|
| 1 | request for lighting of pre-heater warning lamp | CAN |
| 2 | lighting of pre-heater warning lamp | Comfort VAN |
Pre-heater plugs (1160)
Role
The pre-post heating glow plugs allow a rapid temperature rise in the combustion chambers during the starting phase
Description
11 volt pre-heater plugs
Total length of 118,5 mm
Composition of the pre-heat glow plugs
- A heating resistor
- A metallic protective cover
Pre-post heat box (1150)
Role
The housing supplies the pre-heating plugs with electricity following the injection ECU's commands
Description
The pre-post heating times are determined by the injection ECU
If the pre-heater control unit develops a fault, the injection ECU will memorise the fault
Electrical special features
Allocation of channels of connector
- Line N° 1: earth
- Line N° 3: after ignition +12 volts
- Line N° 4: engine check ECU input
- Line N° 5: pre-heater control unit diagnostic
- Line N° 8: permanent +12 volts
- Line N° 9: supply to the glow plugs
Location
| reference | designation |
|---|---|
| 3 | pre-heater plug |
| 4 | electrical harness |
| 5 | pre-heater control unit |
| 6 | engine cylinder head |
Pre-postheating
The pre-heating and post-heating times are determined by the ECU in accordance with the engine's cooling liquid's temperature
Pre-heating operation
| engine coolant temperature | pre-heating time |
|---|---|
| - 20 °C | 10 seconds |
| - 10 °C | 7 seconds |
| 5 °C | 3,5 seconds |
Heating of the pre-heater plugs under starting
During the starting phase, the pre-heater plugs are supplied in the following cases
- Engine coolant temperature lower than 20°C
- Engine running at more than 70 rpm for 0,2 seconds
NoteIf the starter is not operated, when the warning light goes out, the glow plugs remain supplied for a maximum of 5 seconds
Postheating operation
The postheating extends the operating of the pre-heater plugs after the starting phase
The post-heating enables the emission of pollutants in the first few minutes after starting to be reduced
The postheating reduces blue exhaust fumes and emissions at altitude
| engine coolant temperature | post-heating duration |
|---|---|
| - 30 °C | 3000 seconds |
| 20 °C | 2200 seconds |
| 40 °C | 1500 seconds |
| 65 °C | 0 seconds |
Parameters which could interrupt post-heating
- Engine coolant temperature lower than 60°C
- Injected fuel flow exceeding 30 mm3 (between 1200 and 1500 rpm)
- Injected fuel flow exceeding 10 mm3 (2500 rpm)
- Injected fuel flow exceeding 5 mm3 (330 rpm)
- Engine speed above 3500 rpm