Diagnostic Functions Additional Heater 912-D

Overview

General




The control module has a built-in diagnostic system, the Volvo on-board diagnostic (OBD) system, which continuously monitors itself and its input and output signals.

Diagnostic trouble codes (DTCs)
If the control module detects a fault it will store a diagnostic trouble code (DTC). The control module can store up to 23 diagnostic trouble codes (DTCs).
If for some reason a fault disappears after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault is stored in the control module.

Reading off Volvo on-board diagnostic (OBD) system




Fault data and other information can be read off using the VIDA PC which is connected to the data link connector (DLC) under the center console cover.

Volvo on-board diagnostic (OBD) system
With the VIDA PC it is possible to:
- read off and erase diagnostic trouble codes (DTCs) stored.
- read off and erase the low current protection status.
- continuously monitor the value and status of input and output signals.
- activate certain functions.
- program the control module with certain information.
- read the control module identification.
To activate the Volvo on-board diagnostic (OBD) system:
- ignition on.
- battery voltage normal.

Reading and erasing diagnostic trouble codes (DTCs)
Stored diagnostic trouble codes (DTCs) can be erased using this function. The on-board diagnostic (OBD) system can identify 23 different faults in the form of diagnostic trouble codes (DTCs).
Erasing diagnostic trouble codes (DTCs) can only be carried out when all diagnostic trouble codes (DTCs) have been read at least once.

Read off and erase the low current protection status
With this option the low current protection status can be read off and erased.
The control module uses the low current protection to interrupt or shut off the additional heater while running if the control module registers that the power supply is too low.

Reading off input and output signals
Using this function the values and status of the control module input and output signals can be continuously read off.
The following parameters can be read off:
- battery voltage, value
- outside temperature, value
- coolant temperature, value
- additional heater, status
- ignition supply, status
- generator (GEN) voltage D+, status
- the status displays whether or not the control module has registered too low power supply.
- fuel pump (FP), status
- glow plugs, status
- water pump, status
- combustion fan, value
- timer, status
- run time, value

Activating components/functions




With this option the components/functions in the additional heater system can be activated.
The following components can be activated:
- additional heater.
- water pump.
- combustion fan.
- glow plug.

Reading off programming data
With this option it is possible to read programmed data and program in data. The aim with this programming is set up the additional heater function according to the customer's requirement.

Note! If possible read off all data from the control module before replacing the control module. After replacement the current data is programmed into the new control module.

The programmable data is the start temperature setting. Start temperature refers to the highest outside temperature at which the additional heater may start.

Reading off control module identification
The control module ID can be confirmed by reading off a code from the control module memory.
This code contains information about the control module P/N.