24-08-2012, 08:59 AM
(24-08-2012, 04:16 AM)gareth7 Wrote: HDi's rarely use the glow plugs.......
that statement is wrong!
it should read
"Hdi's glowplug light rarely iluminates"
as the glow plugs work without showing the light for post starting heating, it only iluminates fror pre starting heating
10 - 1 - PRE-HEATING
As soon as ignition is switched on : The engine management control unit supplies the glow plugs and controls the lighting of the warning light on the instrument panel, depending on the coolant temperature; The pre-heating time varies depending on the coolant temperature .
NOTE : the warning light on the instrument panel only comes on during the pre-heating phase; it comes on for the duration of the pre-heating .
coolant temperature pre-heating time
(second(s))
-30°C 20
-10°C 5
0°C 0.5
+18°C 0
If the starter is not operated, when the warning light goes out, the glow plugs remain supplied for a maximum of 10 seconds .
During the starting phase, the glow plugs are supplied under the following conditions :
• the coolant temperature is below 20 degrees C
• the engine runs at more than 70 rpm for 0.2 second(s)
10 - 2 - POST HEATING
Post-heating consists of prolonging the operation of the glow plugs for a maximum of 60 seconds from the end of the starting phase .
Parameters which could interrupt post-heating :
• coolant temperature greater than 20 degrees C
• flow injected greater than 35 mm3
• engine speed above 2000 rpm