Synopsis
BB00: battery
CA00: ignition switch
V1150: pre-heater warning lamp
1150: preheater relay
1160: pre-heater plugs
Pre/post heating relay (1150)
Role
The pre-post heating relay supplies the glow plugs which allow starting
Description
This relay which supplies the pre-post heating glow plugs controlled by the injection ECU is a single fused relay
The pre-post heating times are determined by the injection ECU
If the pre-post heating unit fails, the injection ECU memorises a fault
Special features
Assignment of the 5V.VE connector terminals
- Terminal 1: earth
- Terminal 2: not used
- Terminal 3: ignition controlled +
- Terminal 4: control
- Terminal 5: pre-post heating diagnostics
Location
The pre-heat harness connector is located on a support screwed to the water outlet housing
Pre-post heat plugs (1160)
Role
The pre-post heating glow plugs allow a rapid temperature rise in the combustion chambers during the starting phase
Description
The supply to the glow plugs is provided by the pre-heating unit
The body of the glow plug provides the link with the earth when it is fitted
Composition of the pre-heat glow plugs
- 1 heater element
- 1 protective metal cover
Location
The glow plugs are positioned on the engine cylinder head and emerge in the pre-combustion chambers
Pre-heater warning lamp (V1150)
Role
The warning lights informs the driver of the pre-heat phase; ignition time depends on the engine temperature
Description
As soon as the ignition is switched on the injection ECU supplies the pre-heat warning light which is connected at its other end to the earth
Location
The pre-heat warning light is located on the instrument panel
Principle of pre-post heating
The pre-heat and post-heat times are determined by the injection ECU
Pre-heating
The pre-heat time is determined by mapping according to the battery voltage and the coolant temperature
Heating of glow plugs produced by the starter
The pre-heat glow plugs and the warning light operate as soon as the ignition is switched on
When the warning light goes out the glow plugs remain supplied to the maximum for 10 to 15 seconds, if the starter has not been operated
The warning light is no longer lit when the engine coolant temperature is higher than 80 °C
NoteIf the starter is not operated, when the warning light goes out, the glow plugs remain supplied for a maximum of 15 seconds
Post heating
The post-heating enables the operating phase of the plugs to be extended after the starting phase (for 3 minute(s))
The post-heating enables the emission of pollutants in the first few minutes after starting to be reduced
The pre-heat time depends solely on the engine temperature
The post-heat time delay starts as soon as the starter is released
Parameters which could interrupt post-heating
- Coolant temperature greater than 60 degrees C
- Load lever switch
After the post-heating there is always an intermediate heating time if the following criteria are not fulfilled
- Coolant temperature (0 °C)
- Flow of fuel injected (35 mm3)
- Engine speed (1000 rpm)