Diagnostic Functions

Diagnostic functions

General
The Suspension module (SUM) has integrated self diagnostics that check input and output signals to detect damaged components and cables.

Diagnostic trouble codes (DTCs) and status
If the control module detects a fault, a diagnostic trouble code (DTC) is stored. However the control module continues to run the system in fail-safe mode,
The status is displayed for a given diagnostic trouble code (DTC) if it is permanent or intermittent.
A fault that was detected during the last run diagnostic is defined as permanent if the current diagnostic is carried out during the ongoing operating cycle. Other faults are defined as intermittent.
The Suspension module (SUM) defines an operating cycle as ignition on and ignition off.

Reading and erasing diagnostic trouble codes (DTCs)
Diagnostic trouble codes (DTCs) can be read off and erased using the diagnostic tool.
Diagnostic trouble codes (DTCs) can only be erased when all the stored diagnostic trouble codes (DTCs) have been read at least once, (occurs automatically in the diagnostic tool).

Reading off input and output signals
The value of many of the signals to and from the Suspension module (SUM) can be read out in the diagnostic tool to facilitate fault-tracing.
For more information about parameters, see Vehicle communication information in Specifications, other.

Activating components
Active components connected to the Suspension module (SUM) can be activated in the diagnostic tool for function checks, in connection with fault-tracing or replacement.
For more information on activations, see Vehicle communication information under Specifications, other.

Calibration
After replacing the control module, other components in the system or loading new software in the control, adaptive data in the control module must be updated by calibrating.
Calibration is carried out in the diagnostic tool's vehicle communication.

Control module identification
The diagnostic tool identifies control modules by reading off a code from the control module memory.
The code contains information about the control module's:
- hardware P/N (control module without software)
- hardware serial number (control module without software)
- software P/N
- diagnostic software P/N (part of the software).