Description Of Parameters: Fuel

FUEL LEVEL (VIA CAN) (%) 

The value indicates the actual fuel level in the fuel tank. The signal, which comes from the fuel level sensor which is directly connected to the Central Electronic Module (CEM), is sent to the Engine Control Module (ECM) via CAN.

0% = empty fuel tank.

100% = full fuel tank.

FUEL PUMP LOW PRESSURE SIDE (STATUS) 

The status regards the signal that the Engine Control Module (ECM) sends to the Central Electronic Module (CEM) via CAN with the request to supply voltage to the fuel pump control module and the fuel pump for the low pressure side.

On = Request for voltage supply is active.

Off = Request for voltage supply is not active.

Normal value: On. In a trouble-free system the request is active when the combustion engine is running.

FUEL PUMP LOW PRESSURE SIDE, WORKLOAD (%) 

The value indicates the actual control signal to the fuel pump control module for the low pressure side.

Measurement range = 0 - 100%.

Normal value: 50% (±10%) at idle with hot engine. Working range is 10 - 85%.

FUEL PRESSURE LOW PRESSURE SIDE (PA) 

The value indicates the actual fuel pressure on the low pressure side and is calculated by the signal from the directly connected fuel pressure sensor on the low pressure side. The pressure regards absolute pressure.

Measurement range: 0 - 1000 kPa.

Normal value: 500 - 530 kPa with hot engine at idle in neutral. In the event of extreme heat, the requested pressure can be as high as 720 kPa.

HINT: In a trouble-free system, the value should follow "Fuel pressure low pressure side, setpoint value". 

FUEL PRESSURE LOW PRESSURE SIDE, SETPOINT VALUE (PA) 

The value indicates the actual requested fuel pressure on the low pressure side. The pressure regards relative pressure.

Measurement range: 0 - 900 kPa.

Normal value: 400 - 430 kPa with hot engine at idle in neutral. In the event of extreme heat, the requested pressure can be as high as 620 kPa.

FUEL TEMPERATURE LOW PRESSURE SIDE (°C) 

The value indicates the temperature of the fuel on the low pressure side. The temperature is a calculated temperature.

Measurement range: -40 - 120°C.

HINT: The engine is considered to be cool when the engine has been switched off for at least 10 hours. The temperature can then be compared with the ambient temperature and the difference must not be greater than ±5°C. 

FUEL PRESSURE HIGH PRESSURE SIDE (PA) 

The value indicates the actual fuel pressure on the high pressure side and is calculated by the signal from the directly connected fuel pressure sensor on the high pressure side. The pressure regards absolute pressure.

Measurement range: 0 - 200 MPa.

Normal value: 3 - 8 MPa with hot engine at idle in neutral. When the engine is switched off the temperature increases in the fuel rail. Thereby, the fuel pressure also increases.

HINT: In a trouble-free system, the value should follow "Fuel pressure high pressure side, setpoint value". 

FUEL PRESSURE HIGH PRESSURE SIDE, SETPOINT VALUE (PA) 

The value indicates the actual requested fuel pressure on the high pressure side. The pressure regards absolute pressure.

Measurement range: 0 - 200 MPa.

Normal value: 3 - 8 MPa with hot engine at idle in neutral. With the ignition on the requested pressure is 12 MPa.

FUEL TEMPERATURE HIGH PRESSURE SIDE (°C) 

The value indicates the actual temperature of the fuel on the high pressure side. The temperature is a calculated temperature.

Measurement range: 0 - 160°C.

The engine is considered to be cool when the engine has been switched off for at least 10 hours. The temperature can then be compared with the ambient temperature and the difference must not be greater than ±5°C.

FUEL FLOW CONTROL VALVE (%) 

The value shows the actual control signal from the Engine Control Module (ECM) to the directly connected fuel flow control valve on the fuel pump for the high pressure side.

Measurement range 0-100%.

Working range: 0 - 100 %. 0 % means that the control module closes the valve in a position when minimal pressure build-up occurs, in practice during fuel shut-off. 100 % means that the valve closes in a position when pressure build-up occurs.

Normal value: 10 - 30 % with hot engine at idle in neutral.

EVAP VALVE (%) 

The value indicates the actual control signal to the directly connected EVAP valve. The control module opens the valve when the conditions to be able to drain the canister of hydrocarbons are met.

Measurement range 0-100%.

0% = closed valve.

100% = fully open valve.

The valve is normally closed immediately after the engine has started. It is closed while waiting for fuel trim to start, which requires the engine to be hot among other things. If fuel trim does not need to adjust the fuel amount, the valve opens, on the condition that the pressure on the intake manifold is less than the atmospheric pressure, which is the pressure in the fuel tank and canister.

EVAPORATIVE EMISSIONS SYSTEM (EVAP) FLOW (G/S) 

The value indicates the calculated flow through the EVAP valve. The value is calculated by the control module using the EVAP valve's actual position, as well as the difference between the pressure in the tank and the intake manifold.

Measurement range 0-1.5 g/s.

Normal value: 0 g/s when the EVAP valve is closed.

HINT: Greater opening of the valve, and greater pressure difference between tank and intake manifold gives a greater flow.