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 illustration below gives the same information as the Volvo component designations.
| Input signals |
Output signals |
| Directly connected: |
Directly connected: |
- Ignition switch (3/1)
- Air conditioning (A/C) pressure sensor (7/8)
- Brake light switch (from the central electronic module (CEM)) (3/9)
- Accelerator pedal (AP) position sensor (7/51)
- 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 / 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 oxygen sensor, bank 1 (7/15)
- Front oxygen sensor, bank 2 (7/82)
- Rear oxygen sensor, bank 1 (7/103)
- Rear oxygen sensor, bank 2 (7/104)
- Oil level sensor (7/35)
- Outside temperature sensor (6/62)
- Ignition coils (20/3-8)
- 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))
- Engine coolant level sensor (7/73)
|
- 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 (8/6-11)
- Fuel pump (FP) control module (4/83)
- Ignition coils (20/3-8)
- Leak diagnostic unit (6/67), (certain markets only).
- Front oxygen sensor, bank 1 preheating (7/15)
- Front oxygen sensor, bank 2 preheating (7/82)
- Rear oxygen sensor, bank 1 preheating (7/103)
- Rear oxygen sensor, bank 2 preheating (7/104)
- Main relay (system relay) (2/32)
- Starter motor relay (2/35)
- Camshaft reset valve (CVVT), intake (8/19)
- Emissions warning lamp (5/1)
- Actuator variable intake manifold, upper (6/139)
- Actuator variable intake manifold, lower (6/140)
- Cam profile solenoid 1 (CPS1) (8/125)
- Cam profile solenoid 2 (CPS2) (8/126)
|
| 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 CAN communication: |
Via CAN communication: |
- Central electronic module (CEM) (4/56):
- accelerator pedal position, (analog and PWM-signal)
- 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
- steering angle
- status engine heater (on/off)
- Brake control module (BCM) (4/16):
- status brake pedal
- vehicle speed
- active control function
- front wheel spin to detect "rough roads"
- torque limiting request
- Climate control module (CCM) (3/112):
- 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
- Rear electronic module (REM) (4/58).
- Steering wheel module (SWM) (3/254).
|
- 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)
- alternator control module (ACM) load
- fault status alternator control module (ACM)
- Climate control module (CCM) (3/112):
- 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)
- engine coolant temperature (ECT)
- engine speed
- accelerator pedal position
- status brake pedal
- 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)
- 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
- status brake pedal
- Rear electronic module (REM) (4/58).
- Steering wheel module (SWM) (3/254).
|
Courtesy of VOLVO CARS CORPORATION
Courtesy of VOLVO CARS CORPORATION