K-Line: Difference between revisions

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== Connection points ==
== Connection points ==
=== OBD2 ===
K-line uses the standard pin 7 on the [[Data link connector (OBD2)|OBD2 connector]]


=== ECU ===
=== ECU ===


==== '''If you have 1.6 or 2.0 without immobilizer installed:''' ====
==== If you have 1.6 or 2.0 without immobilizer installed: ====
Good news! Your K-Line pins (OBD2/MCC) are connected directly to the K-line pin on the ECU (2.0 - 77)
Good news! Your K-Line pins (OBD2/MCC) are connected directly to the K-line pin on the ECU (2.0 - 77)


==== '''If you have 1.6 or 2.0 with immobilizer installed:''' ====
==== If you have 1.6 or 2.0 with immobilizer installed: ====
Your K-Line pins (OBD2/MCC) are connected to BCM's "Diagnosis" pin (BCM-IM, pin 19). '''THERE IS NOTHING CONNECTED TO K-LINE PIN AT THE ECU!!''' (2.0 77). Instead, all K-line stuff is connected to the ECU's W-Line (2.0 - 47)
Your K-Line pins (OBD2/MCC) are connected to BCM's "Diagnosis" pin (BCM-IM, pin 19). '''THERE IS NOTHING CONNECTED TO K-LINE PIN AT THE ECU!!''' (2.0 77). Instead, all K-line stuff is connected to the ECU's W-Line (2.0 - 47)


==== '''If you have 2.7 with or without immobilizer installed:''' ====
==== If you have 2.7 with or without immobilizer installed: ====
Your K-Line pins (OBD2/MCC) are connected to BCM's "Diagnosis" pin (BCM-IM, pin 19). Your K/Immo-Line pin at the ECU (C133-1, pin 3) is connected to BCM's "Immo W-line" (BCM-IM, pin 20). 2.7 ECUs don't have a separate K and W line - it's all integrated in one pin, you don't have nothing to worry about.
Your K-Line pins (OBD2/MCC) are connected to BCM's "Diagnosis" pin (BCM-IM, pin 19). Your K/Immo-Line pin at the ECU (C133-1, pin 3) is connected to BCM's "Immo W-line" (BCM-IM, pin 20). 2.7 ECUs don't have a separate K and W line - it's all integrated in one pin, you don't have nothing to worry about.


== KWP2000 ==
== KWP2000 ==
Recommended document: [https://opengk.org/files/Users/dante383/OBDII%20Specifications%20-%20KWP2000%20DaimlerChrysler%202002.pdf OBDII Specifications - KWP2000 DaimlerChrysler 2002.pdf]
To start communication, you need to use Fast Init - so bring the K-line down for exactly 25ms, then up for 25ms followed by StartCommunication request. Python example of that using a FTDI cable [https://github.com/Dante383/gkbus/blob/a3ff894e8352ef2faab36e22553da7ddf5688cb8/gkbus/interface/kline/KLineSerial.py#L48 can be found in GKBus] code.
To start communication, you need to use Fast Init - so bring the K-line down for exactly 25ms, then up for 25ms followed by StartCommunication request. Python example of that using a FTDI cable [https://github.com/Dante383/gkbus/blob/a3ff894e8352ef2faab36e22553da7ddf5688cb8/gkbus/interface/kline/KLineSerial.py#L48 can be found in GKBus] code.


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==== Challenge-response calculation ====
==== Challenge-response calculation ====
SIMK43/41 uses a 2 byte seed and 2 byte key for security access. Until a write-up about the algorithm is prepared, you can take a look at it's Python implementation in GKFlasher: https://github.com/Dante383/GKFlasher/blob/15a715b18f2119d697a5ceed00f6383f690c4a23/ecu.py#L42
SIMK43/41 uses a 2 byte seed and 2 byte key for security access. You can take a look at it's Python implementation in GKFlasher: https://github.com/Dante383/GKFlasher/blob/15a715b18f2119d697a5ceed00f6383f690c4a23/ecu.py#L42
 
The algorithm presents as so (Python):
 
<code>def calculate_key (seed):</code>
 
<code>    key = 0x9360</code>
 
<code>   </code>
 
<code>    for index in range(0x24):</code>
 
<code>        key = key * 2 ^ seed</code>
 
<code>       </code>
 
<code>    return key & 0xFFFF</code>
 


==== Input-Output local identifiers ====
==== Input-Output local identifiers ====
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|0x12
|0x12
|fuel pump relay
|fuel pump relay
|
|-
|0x13
|a/c compressor relay
|
|
|-
|-
|0x14
|0x14
|fuel pump control
|fuel pump control
|
|-
|0x15
|?
|
|
|-
|-
|0x16
|0x16
|"Canister Close Valve-Clocked" (whatever that means)
|Canister Close Valve-Lock
|
|
|-
|-
Line 103: Line 133:
|cvvt valve
|cvvt valve
|
|
|-
|0x30
|fuel cut-4 cylinders
|i4 non-cvvt only
|-
|-
|0x31
|0x31
Line 109: Line 143:
|-
|-
|0x32
|0x32
|ignition coil #2, 5
|ignition coil #2, 3
|Coil #5 v6 only
|Coil #5 v6 only
|-
|-
Line 156: Line 190:
|v6 only
|v6 only
|-
|-
|0x41
|0x40
|Version Configuration
|Version Configuration
|Automatic Transaxle (0x08) - This is the ECU reset function to install M/T or Non-TCS system.
|Automatic Transaxle (0x08) - This is the ECU reset function to install M/T or Non-TCS system.
|-
|-
|0x42
|0x41
|Version Configuration
|Version Configuration
|Traction Control System (0x08) - This is the ECU reset function to install M/T or Non-TCS system.
|Traction Control System (0x08) - This is the ECU reset function to install M/T or Non-TCS system.
|-
|0x42
|?
|
|-
|-
|0x50
|0x50
|adaptive values
|adaptive values
|0x04 - clear function
|0x04 - clear function
|-
|0x71
|?
|
|-
|0x72
|?
|
|-
|0x73
|?
|
|-
|0x74
|?
|
|-
|0x79
|?
|
|-
|0x7A
|?
|
|-
|0x95
|evap leakage test
|0x06 - start function
|-
|0x96
|?
|
|-
|0xA0
|?
|
|}
|}
<blockquote></blockquote>
<blockquote></blockquote>

Latest revision as of 10:44, 18 March 2025

K-Line on SIMK43 runs at 10400 baud and uses the KWP2000 protocol for diagnostic communication.

Connection points

OBD2

K-line uses the standard pin 7 on the OBD2 connector

ECU

If you have 1.6 or 2.0 without immobilizer installed:

Good news! Your K-Line pins (OBD2/MCC) are connected directly to the K-line pin on the ECU (2.0 - 77)

If you have 1.6 or 2.0 with immobilizer installed:

Your K-Line pins (OBD2/MCC) are connected to BCM's "Diagnosis" pin (BCM-IM, pin 19). THERE IS NOTHING CONNECTED TO K-LINE PIN AT THE ECU!! (2.0 77). Instead, all K-line stuff is connected to the ECU's W-Line (2.0 - 47)

If you have 2.7 with or without immobilizer installed:

Your K-Line pins (OBD2/MCC) are connected to BCM's "Diagnosis" pin (BCM-IM, pin 19). Your K/Immo-Line pin at the ECU (C133-1, pin 3) is connected to BCM's "Immo W-line" (BCM-IM, pin 20). 2.7 ECUs don't have a separate K and W line - it's all integrated in one pin, you don't have nothing to worry about.

KWP2000

Recommended document: OBDII Specifications - KWP2000 DaimlerChrysler 2002.pdf

To start communication, you need to use Fast Init - so bring the K-line down for exactly 25ms, then up for 25ms followed by StartCommunication request. Python example of that using a FTDI cable can be found in GKBus code.

ID of the ECU is 0x11, and as a diagnostic device you should be using ID 0xF1. So an example command and response would look like this:

Diagnostic device: 82 11 F1 27 01 AC (security access request)

ECU response: 83 F1 11 67 02 34 22

Baudrate

By default, SIMK43 uses 10400 baud. On some ECUs (so far testing revealed that <2005 ECUs might not support that), baudrate can be manipulated by additional undocumented parameter of the StartDiagnosticSession service:

Baudrate identifier,

passed to StartDiagnosticSession

Baudrate on K-line

(bits per second)

0x01 10400
0x02 20000
0x03 40000
0x04 60000
0x05 120000

Challenge-response calculation

SIMK43/41 uses a 2 byte seed and 2 byte key for security access. You can take a look at it's Python implementation in GKFlasher: https://github.com/Dante383/GKFlasher/blob/15a715b18f2119d697a5ceed00f6383f690c4a23/ecu.py#L42

The algorithm presents as so (Python):

def calculate_key (seed):

    key = 0x9360

   

    for index in range(0x24):

        key = key * 2 ^ seed

       

    return key & 0xFFFF


Input-Output local identifiers

Identifier (hex) Description Notes
0x10 check engine light
0x11 EVAP canister close valve (on)
0x12 fuel pump relay
0x13 a/c compressor relay
0x14 fuel pump control
0x15 ?
0x16 Canister Close Valve-Lock
0x1A cooling fan relay high
0x1B cooling fan relay low
0x1C main relay
0x20 canister purge valve
0x23 idle speed actuator
0x24 cvvt valve
0x30 fuel cut-4 cylinders i4 non-cvvt only
0x31 ignition coil #1, 4
0x32 ignition coil #2, 3 Coil #5 v6 only
0x33 ignition coil #3, 6 Coil #6 v6 only
0x39 injector cylinder 1 i4 only
0x3A injector cylinder 2 i4 only
0x3B injector cylinder 3 i4 only
0x3C injector cylinder 4 i4 only
0x300701 injector cylinder 1 v6 only
0x300702 injector cylinder 2 v6 only
0x300704 injector cylinder 3 v6 only
0x300708 injector cylinder 4 v6 only
0x300710 injector cylinder 5 v6 only
0x300720 injector cylinder 6 v6 only
0x40 Version Configuration Automatic Transaxle (0x08) - This is the ECU reset function to install M/T or Non-TCS system.
0x41 Version Configuration Traction Control System (0x08) - This is the ECU reset function to install M/T or Non-TCS system.
0x42 ?
0x50 adaptive values 0x04 - clear function
0x71 ?
0x72 ?
0x73 ?
0x74 ?
0x79 ?
0x7A ?
0x95 evap leakage test 0x06 - start function
0x96 ?
0xA0 ?

Routines by local identifier

Identifier (hex) Description Notes
0x00 erase program section
0x01 erase calibration section
0x02 verify and mark blocks as ready to execute Needs to be called after flashing
0x03 unknown requires security access, returned 0x33 0xE0 on a bench ecu
0x04 unknown returns 0x22 Conditions Not Correct Or Request Sequence Error
0x05 unknown returns 0x22 Conditions Not Correct Or Request Sequence Error
0x12 query immobilizer info 1 byte number of keys learnt, 1 bytes immo status (0x01 = learnt), 1 byte key status (0x00 not learnt), 1 byte smartra status if applicable
0x13 needs to be called before immobilizer password teaching/changing
0x14 needs to be called before immobilizer teaching.
0x15 needs to be called before ECU immobilizer reset
0x16 needs to be called before putting immobilizer in limp home mode
0x17 input new limp home password
0x18 activate limp home mode takes user-provided (default: 2345) password as parameters
0x19 confirm limp home password change takes 0x01 as a parameter
0x1A input 6 digit immobilizer password Needs to be called before teaching, resetting or other actions modifying the immo system. Takes password and 6x 0xFF as parameters
0x1B, 0x1C, 0x1D, 0x1E teach keys 1,2,3,4 Takes 0x01 as a parameter
0x20 reset ECU immo. Takes 0x01 as a parameter
0x25 needs to be called before neutralizing smartra
0x26 confirm neutralizing smartra. takes 0x01 as a parameter
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