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| Disconnect plug -1- from Coolant temperature sender-G62--2-. |
Note | By disconnecting the plug from the coolant temperature sender, engine condition “cold” is simulated and when the ignition is switched on a corresponding preheating process is performed. |
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| Unplug connector of the glow plugs. |
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| Connect Hand multimeter for voltage measurement between glow plug connector and engine mass. |
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| Switch on ignition. The approx. battery voltage must be displayed for approximately 20 seconds. |
| If no voltage is present: |
| During the simulated preheating process the glow period warning lamp -K29- must light up. |
| If the warning lamp does not light up: |
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