Output signals

Fig 1: Identifying Output Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Output signal to		Used for/Remarks
1	Engine control module (ECM)	--
2	Sparkplugs	Ignition takes place at the same time in cylinders 1, 4, and 2, 3.
3	Ignition coils	Separate coils for cylinders 1/4 and 2/3. New design, coils are located above the sparkplugs for cylinder 3 and 4 and with a cable for 1 and 2, respectively.
4	evaporative emission system (EVAP) valve	Controls the flow from the canister inlet manifold, or to the turbo during the charging phase. The valve is located on the radiator.
5	Turbocharger (TC) control valve.	Controls the pressure in the wastegate's control valve. The turbo control valve is located on the air filter housing.
6	Fuel pump	No separate pump relay.
7	Leakage diagnosis pump (LDP)	This pump with pressure sensor is located in the rear of the car, beside the fuel tank.
8	Injectors	Controlled individually. The fuel is shut off at 6,500 RPM as overspeed protection. Shut-off at engine braking over 1,800 RPM.
9	AC compressor relay	Cut-in/cut-out of AC compressor. Direct control of AC compressor for compensation of high idle RPM.
10	air conditioning (A/C) compressor.	Activated/deactivated with AC compressor relay.
11	Control module immobilizer	Electronic immobilizer type 3 based on the challenge-response principle.
12	Diagnostic socket (DLC)	No direct connection to DLC. Troubleshooting is always done via control module immobilizer. The communication cable between Engine control module (ECM) and Control module immobilizer is used for both diagnostics and immobilizer function.
13	Combination instrument	Receives a lot of signals from Engine control module (ECM): injected fuel amount to /trip computer RPM-signal to tachometer and to calculate the engine's driving time for SRL if a certain trouble code is active, then MIL is activated digital signal about the coolant temperature.
14	Transmission control module (TCM)	Communication with Transmission Control Module (TCM) takes place via two cables. Signals are based on CAN communication principle. Up to 38 different signals are communicated via this system. Some of the most important are: engine torque engine speed throttle position engine's coolant temperature fuel shut-off trouble codes and use/limp-home values. From Transmission Control Module (TCM) to Engine control module (ECM): gear lever's position driving mode (E/S/W) brake light switch kick-down switch MIL-request torque reduction (3 levels) trouble codes and use/limp-home values.
15	Dynamic stabilizer system (DSA), control module	Communication across three cables about engine load, RPM, throttle position, request for torque reduction, and confirmation. Also EMS 2000-system trouble prevention DSA-activation.
16	Idle valve (IAC)	Idle RPM and limitation of vacuum in inlet manifold during engine braking. No limp-home function.
17	CVVT	Valve for variable camshaft timing on exhaust side. Same principle as for 5-cylinder engines. Only used for ECT below 60 °C.
18	Engine cooling fan relay for speed 1	Turns on and off cooling fan (FC) with first speed.
19	Engine cooling fan relay for speed 2	Turns on and off cooling fan (FC) with second speed.
20	Engine cooling fan	Cools the engine's radiator. Two speeds.
21	Relay for condenser fan	Turns on/off the condenser's fan
22	Condenser cooling fan	Only on cars with AC
23	System relay	Feeds current to: engine control module (ECM). fuel pump crankcase ventilation's heater Turbocharger (TC) control valve. injectors evaporative emission system (EVAP) valve Ignition coils idle valve (IAC) both heated oxygen sensors (warm-up) mass air flow sensor (MAF)