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Originally Posted by jt20
What is the safety shut-off? Causes?
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This is from the FSM. I didn't include the sections on "Switching of glow current" or"Fault indicator"
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Functions of the preglow time relay:
The preglow time relay has the following functions:
- Switching of glow current
- Ready to start indicator
- Safety shutoff
- Fault indicator
Ready to start indicator
A temperature sensor installed in the preglow time relay determines the duration of the glow period.
When the glow system is switched on, the preglow indicator lamp in the instrument clustrer lights up.
As soon as the required glow period, depending on ambient temperature of preglow time relay, has been attained, the preglow indicator lamp will go out and thereby indicate ready-to-start condition.
Safety Shutoff
If, upon indication of the ready-to-start condition, there is no start within 20-35 seconds, the glow current is interrupted by the safety shutoff. For a subsequent start, the glow system is again switched on for the duration of the starting procedure.
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This tells me that if you don't start the car within 20-35 seconds after the glow light goes out, the relay clicks the glow plugs off.