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, LIN and CAN communication. The graphic below gives the same information as the Volvo component designations.
| Input Signals |
Output Signals |
| Directly connected: |
Directly connected: |
- Air conditioning (A/C) pressure sensor (7/8)
- Brake light switch (from the central electronic module (CEM)) (3/9)
- Accelerator pedal (AP) position sensor (PWM signal) (7/51)
- Electronic throttle unit (6/120)
- Camshaft position sensor, intake (7/172)
- Camshaft position sensor, exhaust (7/173)
- Engine coolant temperature sensor (7/16)
- Engine speed sensor (7/25)
- Fuel pressure sensor / fuel temperature sensor (7/156)
- Knock sensor (KS) (7/23-24)
- Mass air flow (MAF) sensor/air temperature sensor (7/17)
- Manifold absolute pressure (MAP) sensor (7/81)
- Front heated oxygen sensor (HO2S) (7/15)
- Centre heated oxygen sensor (7/82)
- Rear heated oxygen sensor (7/104)
- Oil level-/oil temperature sensor (7/166)
- Outside temperature sensor (6/62)
- Ignition coils (20/3-8)
- Engine cooling fan control module (4/71)
- Leak diagnostic unit (6/67), (certain markets only).
- Gear position status (P/N engaged/disengaged) (from the transmission control module (TCM) (4/28))
- Starter button (from Start control module (SCU)) (3/132)
|
- Air conditioning (A/C) relay (2/22)
- Air conditioning (A/C) compressor (8/3)
- Electronic throttle unit (6/120)
- Engine cooling fan control module (4/71)
- Evaporative emission system (EVAP) valve (8/18)
- Injectors (8/6-11)
- Fuel pump (FP) control module (4/83)
- Ignition coils (20/3-8)
- Leak diagnostic unit (6/67), (certain markets only).
- Front heated oxygen sensor (HO2S), preheating (7/15)
- Centre heated oxygen sensor, preheating (7/82)
- Rear heated oxygen sensor (HO2S), preheating (7/104)
- Main relay (system relay) (2/32)
- Starter motor relay (2/35)
- Camshaft reset valve (CVVT), intake (8/117)
- Actuator variable intake manifold, upper (6/139)
- Actuator variable intake manifold, lower (6/140)
|
| Via LIN communication: |
Via LIN communication: |
- Alternator control module (ACM) (6/26):
- fault status
- magnetization for charging
- Cooler temperature sensor (7/200):
- radiator temperature
- fault status
|
- Alternator control module (ACM) (6/26):
- requested voltage for charging.
- Cooler temperature sensor (7/200):
|
| Via Controller Area Network (CAN) communication: |
Via Controller Area Network (CAN) communication: |
- Central electronic module (CEM) (4/56):
- 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
- charging status
- request for cruise control
- request for adaptive cruise control
- steering angle
- permitted City Safety (yes/no) (only XC60)
- Brake control module (BCM) (4/16):
- brake pedal status (pressed/released)
- vehicle speed
- active control function
- front wheel spin to detect "rough roads
- 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
- gear position
- status gear position (P/N engaged/disengaged)
- "Lock-up" status (engaged/disengaged)
- request for lowest permitted idle speed
- gear ratio
- torque loss in transmission
- Combustion preheater module (CPM) (4/7):
- status engine heater (on/off)
- Forward sensing module (FSM) (4/80):
- request for engine braking
- request for maximum acceleration
- status adaptive cruise control (on/off)
|
- 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
- status cruise control (on/off)
- status adaptive cruise control (on/off)
- alternator control module (ACM) load
- fault status alternator control module (ACM)
- 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):
- gear position
- load
- status cruise control (on/off)
- status adaptive cruise control (on/off)
- engine coolant temperature (ECT)
- engine speed
- accelerator pedal position
- 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
- status cruise control (on/off)
- status adaptive cruise control (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
- accelerator pedal position
- engine status (on/off)
- Differential electronic module (DEM) (4/82):
- engine speed
- engine torque (calculated)
- accelerator pedal position
- brake pedal status (pressed/released)
- Combustion preheater module (CPM) (4/7):
- 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)
|
Courtesy of VOLVO CARS CORPORATION
Courtesy of VOLVO CARS CORPORATION