Control Functions
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
The engine control module (ECM) controls the following components and functions on the basis of these input signals:
- main relay (2/32)
- fuel pump (FP), by activating the fuel pump (FP) relay (2/23)
- fuel injection, by individually activating injectors (8/6-8/10)
- ignition, by transmitting signals to the ignition discharge module (IDM) integrated with the ignition coil (4/44)
- idling speed, by operating the idle air control (IAC) valve (8/5)
- pressure in the inlet manifold during engine braking by regulating the idle air control (IAC) valve (8/5)
- engine cooling fan (FC), by activating the fan control (FC) relay (2/11)
- turbocharger (TC) boost pressure, by controlling the turbocharger (TC) control valve (8/28)
- EVAP-system canister purge (CP) valve (8/18)
- malfunction indicator lamp (MIL) (10/106) for emission-related faults
- preheating of front and rear heated oxygen sensors (HO2S) (7/15 and 7/82)
- air conditioning (A/C) compressor relay (2/22), for shutting-off compressor.
- EVAP canister shut-off valve (8/44), certain markets only.
- pulsed secondary air injection system (PAIR) pump valve (8/43)
- pulsed secondary air injection system (PAIR) pump, by activating the pulsed secondary air injection system (PAIR) pump relay (2/53).