Wiring Diagram VW POLO 2003 - Bosch Motronic MP9 Control Unit - ignition system - knock sensor - engine RPM sender
| N152 | Ignition transformer |
| N157 | Ignition transformer output stage |
| O | Ignition distributor |
| P | Spark plug connector |
| Q | Spark plugs |
| G40 | Hall sender |
| J257 | Mono-Motronic control unit, in plenum chamber (45-pin connector) |
| G61 | Knock sensor |
| S | Starter (50) |
| ACH | To earth crimp, for Aircon crimp |
| D | Earth crimp in engine wiring harness |
| 220 | Earth connection (31) in engine wiring harness |
| 330 | ECU earth crimp for senders, in the engine wiring harness |
Wiring Diagram VW POLO 2003 - Bosch Motronic MP9 Control Unit - senders for intake manifold and coolant temperature - throttle valve potentiometer
| G69 | Throttle valve potentiometer |
| G71 | Pressure sensor |
| G72 | Intake manifold temperature sensor |
| G62 | Coolant temperature sender |
| G2 | Coolant temperature sender |
| J257 | Mono-Motronic control unit, in plenum chamber (45-pin connector) |
| S18 | Fuse - 20 amp |
| J17 | Fuel pump relay |
| TV2 | Junction box for terminal 30 above relay plate |
| TE/1 | Single connector - earth rossette |
| H | To front harness connector, 18-pin |
| T18/ | 18-pin connector |
| K2/ | To 2-pin connector (Right Indicator) |
| J2/ | To 2-pin connector (Left Indicator) |
| TC | To 6-pin connector (cooling fan module, non Aircon models only) |
| 220 | Earth connection (31) in engine wiring harness |
| 330 | ECU earth crimp for sensors, in the engine wiring harness |
Wiring Diagram VW POLO 2003 - Bosch Motronic MP9 Control Unit - injectors - thermo switch for run-on fan
| J363 | Power supply relay for Motronic control unit |
| J257 | Mono-Motronic control unit, in plenum chamber (45-pin connector) |
| G22 | Speedo sender |
| F87 | Thermo switch for run-on fan |
| N30 | Injector Cyl. 1 |
| N31 | Injector Cyl. 2 |
| N32 | Injector Cyl. 3 |
| N33 | Injector Cyl. 4 |
| T6/ | Connector 6-pin, injector rail |
| T9/4 | Aircon connector 9-pin |
| T8/2 | Transponder connection 6-pin |
| Ta | Single connection in engine compartment |
| Tb | 10-pin connector (cooling fan module, Aircon models only) |
| TC | 6-pin connector (cooling fan module, Non Aircon models only) |
| G3 | Positive (+) connector in cable sleeve injectors |
Wiring Diagram VW POLO 2003 - Oil pressure switch - sender for speedometer
| G22 | Speedo sender |
| F1 | Oil pressure switch (0.3 bar) |
| F22 | Oil pressure switch (1.8 bar) |
| Tg/ | To transponder, 6-pin connector |
| 221 | Earth connecion (engine earth) in engine wiring harness |
| 230 | Positive (15) crimp in engine hiring harness |
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