ON-BOARD DIAGNOSTIC SYSTEM EXTERNAL TESTER COMMUNICATION FUNCTION
id040200181600
• The external tester communication function communicates diagnostic information (reading DTCs, reading input/output signal, driving output parts) by sending and receiving signals between the ABS HU/CM and external tester.
Connection and communication information
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External tester
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WDS or equivalent
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Connection
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Communication method
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On-board diagnostic (malfunction detection) function
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Input/output: KLN signal
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Serial communication
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Data monitor function
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Input/output: KLN signal
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Serial communication
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Active command modes function
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Input/output: KLN signal
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Serial communication
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Serial Communication
• Serial communication (synchronous communication) is a method of communication in which many pieces of information are sent and received instantaneously through a single wire.
• By connecting the WDS or equivalent to DLC-2, diagnostic information can be sent and received between the WDS or equivalent and the ABS HU/CM via the KLN terminal.
• The ABS HU/CM receives signals for the malfunction detection function, data monitor function, and active command modes function from the WDS or equivalent, and sends information about DTCs and input/output part operating conditions to the WDS or equivalent.
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Diagnostic function
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Signal received
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Signal sent
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Malfunction detection function
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DTC verification signal
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DTC
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Data monitor function
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Request signal to read selected monitor item
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Monitor information for requested monitor item
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Active command modes function
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Request signal to read selected active command modes item
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Output part drive signal
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