System Overview: Signals

The table below summarizes the input signals to and output signals from the Engine Control Module (ECM). The signal types are divided into directly connected signals, serial communication and controller area network (CAN) communication. The illustration below displays the same information with the Volvo component designations.

Input signals	Output signals
Directly connected:	Directly connected:
Starter button (from Start control module (SCU)) (3/132) Gear position status (P/N engaged/disengaged) (from the transmission control module (TCM) (4/28)) Air conditioning (A/C) pressure sensor (7/8) Stop lamp switch (3/9) Clutch pedal switch (3/271) (manual transmissions only) Accelerator pedal (AP) position sensor (7/51) Throttle position (TP) sensor (via electronic throttle unit) (6/120) Camshaft position sensor, intake (7/172) Camshaft position sensor, exhaust (7/173) Engine coolant temperature (ECT) sensor (7/16) Engine speed (RPM) sensor (7/25) Fuel pressure sensor (7/156) Knock sensor (KS) (7/23, 7/24) Mass air flow (MAF) sensor (7/17) Charge pressure sensor (7/165) Oil level and oil temperature sensor (7/166) Outside temperature sensor (6/62) Front heated oxygen sensor (HO2S) (7/15) Rear heated oxygen sensor (HO2S) (7/103) Leak diagnostic unit (certain markets only) (6/67).	Air conditioning (A/C) relay (2/22) Air conditioning (A/C) compressor (8/3) Electronic throttle unit (6/120) Engine cooling fan (FC) control module (4/71) Evaporative emission system (EVAP) valve (8/18) Injectors (8/6-8/10) Fuel pump control module - fuel pump (FP) (4/83) - (6/33) Ignition coils (20/3-20/7) Leak diagnostic unit (certain markets only) (6/67). Front heated oxygen sensor (HO2S), preheating (7/15) Rear heated oxygen sensor (HO2S), preheating (7/103) Starter motor relay (2/35) Main relay (system relay) (2/32) Turbocharger (TC) control valve (8/28) Camshaft reset valve (CVVT), intake (8/117) Camshaft reset valve (CVVT), exhaust (8/81)
Via LIN communication:	Via LIN communication:
Alternator control module (ACM) (6/26) : fault status magnetization for charging.	Alternator control module (ACM) (6/26) : requested voltage for charging.
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Central electronic module (CEM) (4/56) : clutch pedal position accelerator pedal (AP) position (from the analog signal from the accelerator pedal (AP) position sensor) quantity of fuel in the tank start function inhibiting the time since the engine was switched off request for increased idle speed request for battery charging brake pedal status charging status request for cruise control request for adaptive cruise control steering angle permitted City Safety (yes/no) (only certain versions). Brake control module (BCM) (4/16) : brake pedal status the vehicle speed active control function front wheel spin to detect "rough road" torque limiting request the request for extra wheel torque (only XC60). Climate control module (CCM) (4/6) : air conditioning (A/C) compressor request request for increased fan speed request for lowest permitted idle speed evaporator temperature. Transmission control module (TCM) (4/28) : vehicle speed torque limiting request transmission oil temperature selected gear position status gear position (P/N engaged/disengaged) "Lock-up" status (engaged/disengaged) request for lowest permitted idle speed gear ratio torque losses in the transmission. Combustion preheater module (CPM) (4/7) : engine coolant heater status (on/off). Forward sensing module (FSM) (4/80) : request for engine braking request for maximum acceleration adaptive cruise control status (on/off) Closing velocity module (CVM) (4/125) (only certain versions) : torque limiting request	Central electronic module (CEM) (4/56) : outside temperature request for fuel pump (FP) engine speed load request for the malfunction indicator lamp (MIL) to be lit engine status (on/off) immobilizer codes cruise control status (on/off) adaptive cruise control status (on/off) alternator control module (ACM) load alternator control module (ACM) fault status. Climate control module (CCM) (4/6) : air conditioning (A/C) compressor status atmospheric pressure engine coolant temperature (ECT) engine speed engine status (on/off). Transmission control module (TCM) (4/28) : selected gear position load cruise control status adaptive cruise control status (on/off) engine coolant temperature (ECT) engine speed the position of the accelerator pedal (AP) brake pedal status (pressed/released) speed set in the cruise control engine status (on/off) "kickdown" request. Driver information module (DIM) (5/1) : engine coolant temperature (ECT) warning texts related to the engine control module (ECM) engine speed cruise control status adaptive cruise control status (on/off) calculated fuel consumption engine status (on/off) oil pressure status oil level time for service. Brake control module (BCM) (4/16) : torque after transmission engine speed brake pedal status (pressed/released) position of the accelerator pedal. Differential electronic module (DEM) (4/82) : engine speed engine torque (calculated) the position of the accelerator pedal (AP) brake pedal status (pressed/released). Combustion preheater module (CPM) (4/7) : atmospheric pressure. Forward Sensing Module (FSM) (4/80) : outside temperature accelerator pedal position brake pedal status (pressed/released) engine status (on/off) status cruise control (on/off) status adaptive cruise control (on/off) Closing velocity module (CVM) (4/125) (only certain versions) status torque limiting (on/off)

Courtesy of VOLVO CARS CORPORATION

Courtesy of VOLVO CARS CORPORATION