Output signals
Component Purpose
A/C Compressor Control Valve
Controlling the A/C compressor displacement. Not used by emission related functions.
A/C Relay
Connecting and disconnecting A/C compressor. Not used by emission related func-
tions.
Alternator, LIN (bus)
Exchange of information between the ECM and the other units occurs as well with the
use of LIN serial communication. Not used by emission related functions.
Battery (Kl.30) Provides the ECM with RAM backup voltage.
CAN Exchange of information between the ECM and other Control Units.
CPS - Cam Profile Shifting Is used to control the CPS valves for variable inlet valve lift.
Diagnose Module – Tank Lea-
kage (DMTL)
Detects leakages above 0.5 mm in tank using overpressure.
ECM Power Main ECM power supply
Electronic Throttle Module
To control the engine torque at all driving conditions by regulating the throttle plates, and
hence air flow to the engine, with an electrical motor.
Electronic Fan Control Module
(EFCM)
The EFCM allows continuously variable control of the fan motor’srotation rate.
EVAP Canister Purge Valve To control the purge flow from canister to engine.
Ignition Coils/Power Stages
(1-6)
The ignition coils store energy from the battery and transform to a high voltage ignition
pulse to the spark plugs out of a control signal from the ECM.
Instrument panel Displays the MIL.
Starter Motor Relay Relay to switch on and off starter motor.
System relay Controlled by the ECM. To switch on and off EMS components.
VVT Control Valves, intake (One
for each bank)
Is used to control the Intake VVT valve for VVT Timing.
Pump Electronic Module (PEM)
The PEM is a component within a demand controlled fuel supply system (DECOS).
It’s a power stage that is used to control the flow rate and pressure of the fuel pump
continuously.
Spark plugs (1-6)
Transfer the high-tension ignition voltage generated within the coil into the cumbustion
chamber. No output signal directly from the ECM.
TCM (Automatic transmission
only)
Receiving signals (through CAN) from ECM. Hard wired Park/Neutral signal from TCM
to ECM.
VIS - Variable Intake System Is used to control the variable intake systems two electricaly controled tuning valves.
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