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Key to diagram 1
| K70 | diesel engine control unit |
| K76 | preheating unit |
| K80 | fuel filter heater relay |
| K114 | main relay |
| K128 | fuel injection pump |
| M70 | vacuum pump |
| R24 | engine oil temperature sensor |
| RZO | coolant temperature sensor |
| R35 | crankshaft position sensor |
| R44 | mass air flow meter (sensor) |
| R65 | intake manifold pressure sensor |
| R67 | accelerator pedal position potentiometer |
| I don't know | instrument cluster plug on engine wiring harness |
| X80 | instrument cluster plug on engine control unit wiring harness |
| X81 | engine and control unit wire plug |
| I | ground point (-) on the front left side |
| R5.1 | glow plug cylinder no. 1 |
| R5.2 | glow plug cylinder no.2 |
| R5.3 | glow plug cylinder no.3 |
| R5.4 | glow plug cylinder no. 4 |
| S43 | cruise control switch |
| S45 | clutch pedal switch, cruise control switch |
| U12 | fuel filter heater |
| U12.1 | heater switch |
| U12.2 | additional resistance of the cabin air blower |
| Y18 | eGR valve |
| Y28 | traction control valve |
| Y29 | boost air pressure reducing valve |
| 8 | ground point (-) on the engine |
| 15 | ignition voltage supply terminal |
| 20A | 20 Amps |
| 30 | permanently energized terminal |
| ZOA | 30 Amps |
| 80A | 80 Amps |
| SY | color information display |
| F10 | fuse F10 |
| F56 | fuse F56 |
| FV10 | main fuse FV10 |
| IMO | immobilizer (anti-theft system) |
| INS | instrument panel |
| MID | multifunctional display |
| MK | engine cooling system |
| STA | starter and battery charging |
| WEG | speedometer |
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