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KWP2000_arduino

This code tries to create an Arduino library for the kwp2000 protocol.

Status PID that are running:

  • PID_00. PIDs SUPPORTED
  • PID_01. MONITOR STATUS SINCE DTCs CLEARED
  • PID_02. FREEZE DTCD
  • PID_03. FUEL SYSTEM STATUS
  • PID_04. CALCULATED ENGINE LOAD
  • PID_05. ENGINE COOLANT TEMPERATURE
  • PID_06. SHORT TERM FUEL TRIM-BANK 1
  • PID_07. LONG TERM FUEL TRIM-BANK 1
  • PID_08. SHORT TERM FUEL TRIM-BANK 2
  • PID_09. LONG TERM FUEL TRIM-BANK 2
  • PID_10. FUEL PRESSURE
  • PID_11. INTAKE MANIFOLD ABSOLUTE PRESSUR
  • PID_12. ENGINE SPEED
  • PID_13. VEHICLE SPEED
  • PID_14. TIMING ADVANCE

Status SERVICE (MODE) that are running:
- MODE_1. Show current data - I/M Monitors and Live Data

For more information see the project wiki

kwp2000 is a communication protocol used in some cars

Example of message exchange with KWP2000 protocol:

the messages for SERVICE are composed as follows (Exemple: StartCommunicatioService, ReadByteByLocalIdentifier):

REQUEST

- Format byte - Target byte - Source byte - SID byte - Parameters - Checksome byte

RESPONSE

- Format byte - Target byte - Source byte - SID Positive Response byte - key byte 1 - key byte 2 - Checksome byte

Exemple request and response of StartCommunicatioService

REQUEST

- Format byte = 0xc1

- Target byte = 0x33

- Source byte = 0xf1

- SID byte = 0x81

- Parameters = NULL
- Checksome byte = 0x66

RESPONSE

- Format byte = 0x83

- Target byte = 0xf1

- Source byte = 0x10

- SID byte = 0xc1

- key byte 1 = 0xe9

- key byte 2 = 0x8f

- Checksome byte = 0xbd

the messages for PID are composed as follows (Exemple: ENGINE SPEED, VEHICLE SPEED):

REQUEST

- Format byte - Target byte - Source byte - Mode byte - Pid byte - Checksome byte

RESPONSE

- Format byte - Target byte - Source byte - SID Positive Response byte - PID Code byte - Parameter value byte - Checksome byte

Exemple request and response of ENGINE SPEED

REQUEST

- Format byte = 0xc2

- Target byte = 0x33

- Source byte = 0xf1

- Mode byte= 0x01

- Pid byte = 0x0d

- Checsome byte = 0xf4

RESPONSE

- Format byte = 0x83

- Target byte = 0xf1

- Source byte = 0x10

- SID Positive Response byte = 0x41

- PID Code byte = 0x0d

- Parameter value byte = 0x00

- Checksome byte = 0xd2

To interface Arduino with your car you need to create a circuit that can not burn the Arduino: transforming the 12V that supplies the K line into 5V compatible with Arduino and vice versa

Here you find an example: