Engine management system AHD 2.5 TDI since February 1999 (III).
Diesel fuel injection control unit, engine crankshaft speed sensor, injector needle stroke sensor, intake manifold temperature sensor, electronic engine immobilizer control unit
| G28 | engine crankshaft speed sensor, on the rear left side of the engine |
| G72 | temperature sensor in the intake manifold, in the engine compartment, front left |
| G80 | injector needle stroke sensor |
| J248 | diesel fuel injection control unit, near the battery |
| J362 | electronic engine immobilizer control unit, on the left behind the instrument panel |
| K117 | electronic engine immobilizer warning light |
| T2 | wiring connector, 2-pin, on the left side of the engine |
| T3а | wiring connector, 3-pin, near the engine speed sensor |
| T12s | wiring connector, 12-pin |
| T14 | wiring connector, 14-pin, in the lower part of the passenger compartment, front left, connector for the VAG 1551 tester |
| T22d | wiring connector, 22-pin, left under the instrument panel |
| T68 | wiring connector, 68-pin |
| (11) | connection to "ground" |
| (156) | connection to the body in the wiring kit of the diesel fuel injection system |
| (220) | connection to the body (mass sensor) included with engine wiring harness |
| (H20) | connection 1 in the diagnostic wiring kit (rotation speed signal) |
| (H21) | connection 2 in the diagnostic wiring harness |
| * | not available on vehicles with electronic engine immobilizer |
| - - - | only on vehicles with electronic engine immobilizer |
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