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8.15.2 Request Message Definition (Table 153).
Table 153: TesterPresent Request Message
Data Byte Parameter Name
Cvt Hex Value Mnemonic
#1
TesterPresent Request Service Id
M
3E
SIDRQ
8.15.2.1 Request Message Sub-Function $Level Parameter Definition. 
There are no sub-function
parameters used by this service.
8.15.2.2 Request Message Data Parameter Definition. 
This service does not contain a data-parameter(s).
8.15.3 Positive Response Message Definition. 
(Table 154) The use of any response, either positive or
negative is dependant on how the request message was addressed. If the request message is addressed
functionally (to multiple nodes using the AllNodes $101 CANId) then there shall be no response, either positive
or negative. If the request message is addressed physically (using the nodes point to point diagnostic request
CANId) then there shall be a response, either positive or negative.
Table 154: TesterPresent Positive Response Message
Data Byte Parameter Name
Cvt Hex Value Mnemonic
#1
TesterPresent Positive Response Service Id
M
1
7E
SIDPR
Where:
M
1 
= The TesterPresent positive response message shall only be sent if the request message was physically
addressed.
8.15.3.1 Positive Response Message Data Parameter Definition. 
There are no data parameters used by
this service in the positive response message.

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