01 · General

Control system

0 AdministrationControl system

Design and Function

Applies to: 2002–2005; B5244SG2

Integrated in the existing engine management system from DENSO. New features are marked in bold text.

Input signals

No.	Sensor / function	Explanation
1	Engine control module (ECM)	Gas control integrated.
2	Engine speed (RPM) sensor	Information about the engine speed (RPM).
3	Heated oxygen sensor (HO2S)	Information about the oxygen content in the exhaust gases.
4	Manifold absolute pressure (MAP) sensor	Information about the pressure in the intake manifold.
5	Temperature sensor	Information about the engine coolant temperature.
6	Throttle Position Sensor (TP), Electronic Throttle Module	Information about the throttle position.
7	Level sensor	Provides data about the fuel level.
8	Switch in the climate control module	Selects gasoline or gas operation.
9	SRS (supplemental restraint system)	Transmits information to the rear electrical module and the engine control module (ECM) to close the shut-off valves in the event of a collision.
10	Stepper motor	Transmits information about whether the stepper motor is functioning or not.

Output signals / controlled components

No.	Sensor / function	Explanation
11	Combined instrument panel, Fuel gauge	Displays the quantity of Liquefied petroleum gas (LPG) in the tank.
12	Combined instrument panel, Warning lamp	The lamp lights at low fuel pressure.
13	Combined instrument panel, Liquid crystal display (LCD)	Warns of changeover to gasoline operation. Displays service information and gasoline level.
14	Stepper motor, fuel rail	Controls the stepper motor. Pulse width modulation (PWM) signal.
15	Shut-off valve, DFCO (deceleration fuel cut off)	Controls the valve on the fuel rail.
16	Switch in the climate control module	The lamp indicates gasoline operation.
17	Shut-off valve, fuel tank	Controls, via the rear electrical module, the relay which activates the valve.
18	Data Link Connector (DLC)
-	Shut-off valve, engine compartment	Controlled by the engine control module (ECM).

Applies to: 2002–2006; B5244SG

Integrated in the existing engine management system from DENSO. New features are marked in bold text.

Input signals

No.	Sensor / function	Explanation
1	Engine control module (ECM)	Gas control integrated.
2	Engine speed (RPM) sensor	Information about the engine speed (RPM).
3	Heated oxygen sensor (HO2S)	Information about the oxygen content in the exhaust gases.
4	Manifold absolute pressure (MAP) sensor	Information about the pressure in the intake manifold.
5	Temperature sensor	Information about the engine coolant temperature.
6	Throttle Position Sensor (TP), Electronic Throttle Module	Information about the throttle position.
7	Level sensor	Provides information about temperature and pressure to the rear electrical module which calculates the gas level.
8	Switch in the climate control module	Selects gasoline or gas operation.
9	SRS (supplemental restraint system)	Transmits information to the rear electrical module to close the gas valves in event of a collision.
10	Stepper motor	Transmits information about whether the stepper motor is functioning or not.

Output signals / controlled components

No.	Sensor / function	Explanation
11	Combined instrument panel, Fuel gauge	Displays the amount of CNG in the tank.
12	Combined instrument panel, Warning lamp	The lamp lights at low fuel pressure.
13	Combined instrument panel, Liquid crystal display (LCD)	Warns of changeover to gasoline operation. Displays service information and gasoline level.
14	Stepper motor, fuel rail	Controls the stepper motor. Pulse width modulation (PWM) signal.
15	Shut-off valve, DFCO (deceleration fuel cut off)	Controls the valve on the fuel rail.
16	Switch in the climate control module	The lamp indicates gasoline operation.
17	Shut-off valve, tanks	Controls, via the rear electrical module, the relay which activates the valves.
18	Data Link Connector (DLC)

Parts & tools for this job For 1999 Volvo S80

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