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P2, P2*, S3
Timers in UDS
By Kapil Thakar
0x03 0x22 0xF1 0x20
0x10 0x0B 0x62 0xF1 0x20 0x01 0x02 0x03
Initial 3 Bytes of Data linked with DID
DID
Length
SID+
40
P2, P2*, P4, S3 Timer
Request
First Pending / Final Response
Pending
Pending
Tester ECU
Final Positive Response / General Reject (0x10) NRC
P2
Timer
P2*
Timer
P2*
Timer
P2, P2*, P4, S3 Timer
Extended Session Request 10 03
Set Extended Session Successful: 50 03
Tester ECU
S3
Timer S3 Timer Start
S3 Timeout
Read Active Session
Active Session: Default
S3 Timer
0x02 0x10 0x03
SID
Sub
Function
0 0 0 0 0 0 0 1
Suppress
Pos
Resp
Bit
Sub
Function
data
bytes
Negative
Response
Indicator
P2, P2*, P4, S3 Timer
Extended Session Request 10 03
Set Extended Session Successful: 50 03
Tester ECU
S3
Timer
S3 Timer Start
S3 Timeout will not happen
Read Active Session
Active Session: Extended
Tester Present
S3 Timer Reset
S3 Timer Reset
Questions ?

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Timer Handling in UDS | S3 Server Timer | P2 and P2 Start Timer

  • 1. P2, P2*, S3 Timers in UDS By Kapil Thakar 0x03 0x22 0xF1 0x20 0x10 0x0B 0x62 0xF1 0x20 0x01 0x02 0x03 Initial 3 Bytes of Data linked with DID DID Length SID+ 40
  • 2. P2, P2*, P4, S3 Timer Request First Pending / Final Response Pending Pending Tester ECU Final Positive Response / General Reject (0x10) NRC P2 Timer P2* Timer P2* Timer
  • 3. P2, P2*, P4, S3 Timer Extended Session Request 10 03 Set Extended Session Successful: 50 03 Tester ECU S3 Timer S3 Timer Start S3 Timeout Read Active Session Active Session: Default
  • 4. S3 Timer 0x02 0x10 0x03 SID Sub Function 0 0 0 0 0 0 0 1 Suppress Pos Resp Bit Sub Function data bytes Negative Response Indicator
  • 5. P2, P2*, P4, S3 Timer Extended Session Request 10 03 Set Extended Session Successful: 50 03 Tester ECU S3 Timer S3 Timer Start S3 Timeout will not happen Read Active Session Active Session: Extended Tester Present S3 Timer Reset S3 Timer Reset