Leon Mk2
| Part I |
| 1 - | Connector |
| q | Extract or connect this with the ignition OFF |
| q | Unlock for extraction |
| 2 - | Monomotronic -J257- Engine control unit* |
| q | For the injection system, lambda regulation, active carbon filter solenoid valve, engine speed limiting by the fuel pump relay, inlet manifold preheating control, ignition and self-diagnosis |
| q | Location: in the engine compartment to the left |
| q | For the substitution of the control unit, it must be: adapted to the electronic immobiliser control unit → Chapter |
| 3 - | 10 Nm |
| 4 - | Support |
| q | For engine control unit |
| 5 - | Connector |
| q | 4 -pin |
| 6 - | Coolant temperature sender -G62-* |
| q | With coolant temperature gauge sender -G2- |
| q | Before removal, reduce the pressure of the cooling system |
| q | Checking → Chapter |
| q | Resistance values → Fig. |
| 7 - | O-ring |
| q | Replace if damaged |
| 8 - | Retaining clip |
| 9 - | Connection sleeve |
| 10 - | Lambda probe -G39-*, 50 Nm |
| q | Location: in the exhaust manifold |
| q | Grease thread only with “G5”. “G5” must not get into the slots on the probe body |
| q | Verification of the lambda probe and lambda regulation → Chapter |
| q | Test the supply voltage for the probe heating → Chapter |
| q | Verify the continuity of the lambda probe heat conduction |
| 11 - | 4-pin connector |
| q | For lambda probe and probe heating |
