Description of Parameters

Description of parameters

Hint: Certain parameters have different values depending whether the car was manufactured before or after week 39, 2001. Use VIDA car communication "Reading off data for vehicle configuration " to see the week of manufacture of the car.

Failed start attempts, value
Reading of the number of failed attempts to start the heater.
If the counter reaches 3 the heater cannot start. A diagnostic trouble code (DTC) is stored in the central electronic module if the counter reaches 1 but the heater can still be started. To set the counter to zero erase the diagnostic trouble codes (DTCs).

Overheating incidents, value
Reading of the number of failed attempts to start the heater. If this parameter counts to 3 the heater cannot be started. To set the counter to zero erase the diagnostic trouble codes (DTCs).

Successful start attempts, value
Reading of the number of successful attempts to start the heater. If the heater can be started 10 times in succession the overheat counter is set to zero. The counter is also set to zero when the diagnostic trouble codes (DTCs) are erased.

Coolant temperature, value
The coolant temperature in the heater.
For cars manufactured up to week 38, 2001 inclusive:
The heater cycles between 76 -89 °C (status 5).
For cars manufactured from week 39, 2001 inclusive:
The heater cycles between 76 -93 °C (status 5).

Battery voltage, value
The normal value when the alternator is charging is 13.0- 14.0 V. Voltage shall be at least 10.5 V to start the heater.
Measurement range 0 and up.

Heater run time, value
Reading off the number of hours the heater has been running.
Measurement range: 0-65,535 hours.
The heater is designed to run for approximately 4,500 hours.

Additional heater status, value
Heater operating status:
0: The heater has not started.
1: The heater starts. Heater self test. The glow plug is activated and then the heater fan.
2: The heater starts and the fuel pump is active. The control module awaits combustion for a certain period of time.
3: The heater runs. Normal heater operation.
4: The heater stops. The flame goes out.
5: The heater waits. Waiting for the engine coolant temperature to be low enough for the heater to start again.
6: The heater has stopped. The heater only has this status if a fault has occurred.
7: The flame is extinguished.
8: Residual heat. If, when the outside temperature is low, the driver is in the car and turns on the heater, the water pump starts in order to heat the passenger compartment.
9: Fuel pump activated. Used in production.
10: Activating the fuel pump. Used to avoid problems with the fuel pump sticking.

Actual combustion fan speed, value
Measurement range 0 - 8000 rpm.
For cars manufactured up to week 38, 2001 inclusive:
Normal rpm approx. 4000-4500 rpm as well as at high rpm, approx. 8000 rpm.
For cars manufactured from week 39, 2001 inclusive:
Normal rpm approx.5000 rpm as well as at high rpm, approx. 8000 rpm.

Derived combustion fan speed, value
Measurement range 0 - 8000 rpm.
Displays the theoretical speed that the fan should have.

Degree of modulation of combustion fan, value
Measurement range 0 - 100 %.
Reading of the degree of pulse width modulation that the combustion fan is controlled by.

Fuel pump frequency, value
Measurement range 0-10 Hz.
Reading off the pump frequency of the fuel pump.
For cars manufactured up to week 38, 2001 inclusive: In status no. 2 the pump operates at 4.9 Hz for diesel and 5.5 Hz for petrol.
Cars manufactured from week 39, 2001 inclusive:In status no.2 the pump operates at 5.7 Hz for diesel and 6.8 Hz for petrol.
In status no.3 the pump is controlled by the water temperature. In status nos. 4 and 7 the fuel pump is switched off (0 Hz). The fuel pump is not active in status nos. 1, 7, 5, 6 or 8.

Degree of modulation of Glow plug, value
Measurement range 0-100%.
Reading of the degree to which the glow plug is activated.
For cars manufactured up to week 38, 2001 inclusive:
In status no. 1 the glow plug is supplied completely (100%) or pulsed with the frequency 1 Hz. The degree of modulation of the glow plug depends on the voltage.
For cars manufactured from week 39, 2001 inclusive:
In status no. 1 the glow plug is supplied completely (100%) or pulsed with the frequency 10 Hz. The degree of modulation of the glow plug depends on the voltage.

Flame monitor, value
Measurement range: 0-5 V.
Reading out flame monitor's voltage.
The flame monitor registers the light intensity in the heater and is used to detect if there is a flame or not. The lower the light intensity that the flame monitor detects, the higher the voltage to the control module. The higher the light intensity that is registered, the lower the voltage.
The following applies when the control module uses the signal from the flame monitor to decide if there is a flame or not:
- If voltage is higher than approx. 2.5 V for a certain time, the control module considers that there is no flame.
- If voltage is lower than approx. 2.5 V for a certain time, the control module considers that there is a flame.

Extended X-supply, status
Indicates whether the ignition is on or off according to the control module.

Supply voltage to components, status
Indicates whether the control module is sending supply voltage to the combustion fan, fuel pump and water pump.
On: Voltage
Off: No voltage

Glow plug, status
On: Glow plug activated.
Off: Glow plug not activated.
In status 1 the glow plug is on. In status 2 the glow plug is switched off when a flame is detected. Other statuses the glow plug is off.

Water pump, status
On: Water pump activated.
Off: Water pump not activated (status 6, 9 and 10).

Fuel level, status
Fuel level ok: The control module registers that there are more than 4 litres of fuel in the fuel tank and the heater can be started.
Fuel level too low: The control module registers that there is less than 4 litres of fuel in the fuel tank and the heater cannot be started.