Test Point 22 - Ground and Plug Connections

TEST POINT 22: Ground connections/plug connections

Ground Points
^ Ground point II - fuel pump, wheelhouse front right (end tip)

^ Ground point IV - power ground under the seat, left

^ Ground point V - electronics ground under the seat, left

^ Ground point VI - central electrical ground on side member, right (under lid hinge)

^ Ground point X - battery ground

^ Ground point XI- grounding strip transmission-body (at the starter)

^ Ground point XII - ignition output stages, engine compartment, rear left (between ignition coils)

Are ground connections tight and not corroded? Loosen, clean and retighten ground connections as specified.

CAUTION: Never start the engine as long as the ground lead between the body and transmission is disconnected! This will destroy the control unit immediately!

Plug connections
Are all plugs connected correctly, not loose and not corroded? Disconnect plug connections: the pins and sleeves of the plugs must not be bent or corroded.

^ The 55-pin plug on the DME control unit (under the driver's seat).

^ 14-pin plug (under the driver's seat).

^ A 12-pin plug at the rear left in the engine compartment.

^ A 14-pin plug at the rear left in the engine compartment.

^ A 3-pin plug for the reference mark/speed sensor and a 3-pin plug for the oxygen sensor on the left side of the engine.

^ A 3-pin plug on the throttle valve switch.

^ A 2-pin plug on the solenoid valve for tank venting (center of intake air distributor).

^ A 4-pin plug on the air flow sensor.

^ A 2-pin plug on the NTC II on the left side of the engine. (The temperature sensor is screwed into the cylinder head 3, accessible from below.)

^ Two 7-pin plugs at the ignition output stages at the rear of the engine compartment.

^ 3-pin plug on the Hall sensor (at the ignition distributor).

^ 3-pin plug on knock sensor I (on the left side of the engine).

^ 3-pin plug on knock sensor II (center of intake air distributor).

^ A 2-pin plug on the idle speed control (at the intake air distributor).

^ The two-pin plug on the solenoid valve of the resonance plate (center of the intake air distributor).

^ A 2-pin plug in each case at the injection valves.

Since the Carrera is supplied worldwide with only one standard control unit and the control unit is coded correspondingly depending on the country equipment, this coding must be checked in the event of a complaint.

To allow calling up of the different characteristic maps, a 2-pin or 3-pin plug connection is brought out of the DME wiring harness near the plug receptacle.

The DME control unit is supplied with power via terminal 30 (battery +) as well as via ignition lock terminal 15.