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 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: |
- Air conditioning (A/C) pressure sensor (7/8)
- Stop lamp switch (3/9)
- Accelerator pedal (AP) position sensor (PWM signal) (7/51)
- Electronic throttle unit (6/120)
- Camshaft position (CMP) sensor, intake bank 2 (7/172)
- Camshaft position (CMP) sensor, intake bank 1 (7/188)
- Camshaft position (CMP) sensor, exhaust bank 2 (7/173)
- Camshaft position (CMP) sensor, exhaust bank 1 (7/189)
- Engine coolant temperature (ECT) sensor (7/16)
- Engine speed (RPM) 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)
- Oil pressure switch (7/6)
- Front oxygen sensor, bank 2 (7/15)
- Front oxygen sensor, bank 1 (7/82)
- Rear oxygen sensor, bank 2 (7/103)
- Rear oxygen sensor, bank 1 (7/104)
- Oil level-/oil temperature sensor (7/35)
- Outside temperature sensor (6/62)
- Engine coolant level sensor (7/73)
- Ignition coils (20/46-53)
- Engine cooling fan (FC) 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 (FC) control module (4/71)
- Evaporative emission system (EVAP) valve (8/18)
- Injectors (8/146-153)
- Fuel pump (FP) control module (4/83)
- Ignition coils (20/46-53)
- Leak diagnostic unit (6/67), (certain markets only).
- Front oxygen sensor, bank 2 preheating (7/15)
- Front oxygen sensor, bank 1 preheating (7/82)
- Rear oxygen sensor, bank 2 preheating (7/103)
- Rear oxygen sensor, bank 1 preheating (7/104)
- Main relay (system relay) (2/32)
- Starter motor relay (2/35)
- Camshaft reset valve (Continuous variable valve timing (CVVT)), intake bank 2 (8/19)
- Camshaft reset valve (Continuous variable valve timing (CVVT)), intake bank 1 (8/117)
- Camshaft reset valve (Continuous variable valve timing (CVVT)), exhaust bank 2 (8/81)
- Camshaft reset valve (Continuous variable valve timing (CVVT)), exhaust bank 1 (8/118)
- Valve variable intake (8/107)
|
| 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):
- 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.
- 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.
- 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 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).
|
- 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):
- Gear position
- Load
- Cruise control status (on/off)
- Adaptive cruise control status (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
- Cruise control status (on/off)
- 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
- 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)
- Cruise control status (on/off)
- Adaptive cruise control status (on/off).
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 Courtesy of VOLVO CARS CORPORATION
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 Courtesy of VOLVO CARS CORPORATION
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