User´s Manual - I+ME ACTIA GmbH

Read Trouble Codes
This service ($A9) allows a tester to read the status of node-resident Diagnostic Trouble Code (DTC)
information from any controller, or group of controllers within a vehicle. This service allows the tester
to do the following:
- Retrieve the status of a specific DTC and FaultType combination.
- Retrieve the list of DTCs that match a tester defined DTC status mask.
- Enable a node resident algorithm, which periodically calculates the number of DTCs that match a tester
defined DTC status mask. The ECU shall send a response message each time the calculation yields a
different result than the one calculated the previous time.
Depending on the required action the service has to be configured. Therefor the Setup button in the
Main Diagnostic Setup window could activate the dialog box shown below.
$80 Read Status Of DTC By DTC Number
To retrieve the status of a specific DTC and DTC Fault Type Byte (symptom) combination, setup the
sub-parameter $80 Read Status Of DTC By DTC Number. The user needs to put in the DTC number
(DTC High Byte and DTC Low Byte) and the DTC Failure Type Byte. Acknowledge the settings by
OK.
$81 Read Status Of DTC By Status Mask
To retrieve a list of DTC numbers and DTC Fault Types, which satisfy the defined status mask, setup
the sub-parameter byte $81 Read Status Of DTC By Status Mask. The user needs to select a mask. By
click on Select Mask the user opens the dialog shown below or the user may put in directly a one-byte
hexadecimal value that defines the mask.
Note: CAT uses the End Of DTC Report message to determine when all UUDT responses to a level
$81 request have been sent. For a given node, transmitting another $Level $81 request prior to receiving
the endOfDTCReport message may result in undefined operation.
$82 Send On Change DTC Count
To enable a node-resident DTC count algorithm that periodically calculates the number of DTCs that
match a defined DTC status mask, setup the sub-parameter $82 Send On Change DTC Count. The user
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