System overview: Signals
The chart 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: |
- Fuel tank pressure sensor (7/84)
- Knock sensor (KS) (7/23-24)
- Engine speed (RPM) sensor (7/25)
- Outside temperature sensor (7/105)
- Ignition switch (3/1)
- Oil pressure switch (7/6)
- Camshaft position (CMP) sensor (7/21) (1999-2001)
- Camshaft position (CMP) sensor (7/172) (2002-)
- Engine coolant temperature (ECT) sensor (7/16)
- Stop lamp switch (3/9)
- Manifold absolute pressure (MAP) sensor (7/81)
- Mass air flow (MAF) sensor (7/17) with integrated air temperature sensor
- Heated oxygen sensors (HO2S) (7/15, 7/82)
- Brake pedal position sensor (7/124)
- Clutch pedal sensor (7/123) (Manual transmissions only)
- Air conditioning (A/C) pressure sensor (7/8)
- Accelerator pedal (AP) position sensor (7/51)
- Ignition coils (20/3-7), diagnostics
- Engine coolant level sensor (7/73)
- Data link connector (DLC) (17/13), Communication line.
|
- Air conditioning (A/C) relay (2/22)
- Heated oxygen sensors (HO2S) heater pad (7/15, 7/82)
- Main relay (system relay) (2/32)
- Fuel pump (FP) relay (2/23), via the central electronic module (CEM)
- Ignition coils power stage (20/3-7)
- Injectors (8/6-10)
- EVAP canister shut-off valve (8/44)
- Evaporative emission system (EVAP) valve (8/18)
- Emissions warning lamp (MIL)
- Stop lamp switch (3/9), signal to the electronic throttle module (ETM)
- Engine cooling fan (FC) control module (4/71), pulse width modulated
- Accelerator pedal (AP) position sensor (7/51), signal to the electronic throttle module (ETM)
- Reset valve camshaft continuous variable valve timing (CVVT) (8/19)
- Electronic throttle module (ETM) (4/50)
- Air distribution valve (8/35) (1999-2000).
|
| Via Controller Area Network (CAN) communication: |
Via Controller Area Network (CAN) communication: |
- Transmission Control Module (TCM) (4/28) (only cars with automatic transmissions)
- Electronic throttle module (ETM) (4/50)
- Brake control module (BCM) / Anti-lock Brake System Module (ABS), (4/16)
- Central electronic module (CEM) (4/56).
Via central electronic module (CEM) (4/56):
- Steering wheel module (SWM) (3/130)
- Climate Control Module (CCM) (3/112)
- Rear electronic module (REM) (4/58)
- Data link connector (DLC) (17/13).
|
- Brake control module (BCM) / Anti-lock Brake System Module (ABS), (4/16)
- Transmission Control Module (TCM) (4/28) (only cars with automatic transmissions)
- Differential electronic module (DEM) (4/82) (AWD only)
- Electronic throttle module (ETM) (4/50)
- Central electronic module (CEM) (4/56).
Via central electronic module (CEM) (4/56):
- Climate Control Module (CCM) (3/112)
- Driver information module (DIM) (5/1)
- Phone module (PHM) (16/60) (option)
- Rear electronic module (REM) (4/58)
- Upper electronic module (UEM) (4/70)
- Data link connector (DLC) (17/13).
|
Courtesy of VOLVO CARS OF NORTH AMERICA.
Courtesy of VOLVO CARS OF NORTH AMERICA.