Electrical/electronic circuit

ELECTRICAL/ELECTRONIC CIRCUIT

P4A16JJ01

Wiring

The system has two distinct sets of wiring for the control unit connectors: the engine side wiring (B) which connects the components fitted on the engine to the engine control unit and the vehicle side wiring (A) which connects the other components to the control unit and constitutes the interface with the vehicle wiring.

vehicle side wiring (A)

• supply from the battery
• supply from the ignition switch
• fuses
• system relay feeds
• radiator fan relay(s)
• climate control compressor relay (if fitted)

• CODE control unit connection
• control panel connection
• diagnostic equipment

engine side wiring (B)

• engine speed sensor
• absolute pressure and air temperature sensor
• coolant temperature sensor
• detonation sensor
• Lambda sensor
• power assisted steering end of travel sensor
• injectors
• idle speed actuator/butterfly position sensor

• ignition
• charcoal filter solenoid valve

P4A16J02

Layout of system earth points

In order to increase electro-magnetic compatibility and operational reliability, special care has been taken over the number and the location of the earth points, as can be seen the diagram:

• main earth directly on the battery negative;
• engine control system earth on the cylinder block/crankcase near the detonation sensor.