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Page 17 - J1939 active diagnostic trouble codes in decoded format



Notes:

1. These are read only registers.

2. Some Engine Control Units (ECUs) do not comply with J1939 with respect to trouble codes, the trouble code type must be read to determine the interpretation of the codes.

3. For an ECU that is fully compliant with J1939 this page contains the status as indicated by the last DM1 message, refer to J1939-73 section 5.7.1.

4. For an ECU that is not fully compliant with J1939 this page contains trouble codes as read by the mechanism appropriate to the ECU.

5. The meaning of the lamp status codes is shown in the table below.

6. For details of the Suspect Parameter Number (SPN) refer to J1939-04 Appendix C.

7. For details of the Failure Mode Indicator (FMI) refer to J1939-73 Appendix A.

8. For details of the Occurrence Count (OC) refer to J1939-73 section 5.7.1, a value of 127 indicates that no OC is available.

9. For details of the Fault Code Number, Status of Fault Code and Number of Occurrences refer to the Scania document 'Fault codes EMS S6'.

10. For details of the Fault Code Number refer to the MTU document “Part 3 Maintenance and repair E531 711 / 01 E”

 

Registers

Register offset Name Minimum value Maximum value Scaling factor Units Bits/ Sign
0 Number of active trouble codes 0 63     16
1 Malfunction indicator lamp status 0 3     15/16-16/16
  Red stop lamp status 0 3     13/16-14/16
  Amber warning lamp status 0 3     11/16-12/16
  Protect lamp status 0 3     9/16-10/16
  Reserved for SAE assignment 0 3     7/16-8/16
  Reserved for SAE assignment 0 3     5/16-6/16
  Reserved for SAE assignment 0 3     3/16-4/16
  Reserved for SAE assignment 0 3     1/16-2/16
2-6 Trouble code 1         80
7-11 Trouble code 2         80
12-16 Trouble code 3         80
17-21 Trouble code 4         80
22-246 Trouble codes 5-49          
247-251 Trouble code 50         80

 

 

Lamp status codes

Code System control function
0 Lamp off
1 Lamp on
2 Undefined
3 Unimplemented

 

Trouble code type

Code Format
0 J1939
1 Scania Keyword 2000 (KW2K)
2 MTU
3 Cummins Modbus
4-99 Reserved

 

J1939 type trouble code

Register offset Name Minimum value Maximum value Scaling factor Units Bits/ Sign
0--1 SPN 0 524287     32
2 FMI 0 31     16
3 OC 0 127     16
4 Trouble code type 0 0     16

 

Scania Keyword 2000 (KW2K) type trouble code

Register offset Name Minimum value Maximum value Scaling factor Units Bits/ Sign
0-1 Fault code Number 0 65535     32
2 Status of Fault Code 0 255     16
3 Number of Occurrences 0 255     16
4 Trouble code type 1 1     16

 

MTU type trouble code

Register offset Name Minimum value Maximum value Scaling factor Units Bits/ Sign
0-1 Fault code Number 0 400     32
2 Status of Fault Code 0 255     16
3 Number of Occurrences 0 255     16
4 Trouble code type 2 2     16

Cummins modbus type trouble code

Register offset Name Minimum value Maximum value Scaling factor Units Bits/ Sign
0-1 DTC Number 0 65535     32
2 DTC Type 0 255     16
3 Not used 0 255     16
4 Trouble code type 3 3     16

 

Cummins modbus DTC types

Code System control function
1 Engine DTC Warning
2 Engine DTC Shutdown

 

 

Page 18 - J1939 active diagnostic trouble codes in raw format

Notes:

1. These are read only registers.

2. This page contains the status as indicated by the last DM1 message, refer to J1939-73 section 5.7.1.

3. The meaning of the lamp status codes is shown in the table below.

4. For details of the Suspect Parameter Number (SPN) refer to J1939-04 Appendix C.

5. For details of the Failure Mode Indicator (FMI) refer to J1939-73 Appendix A.

6. For details of the Occurrence Count (OC) refer to J1939-73 section 5.7.1, a value of 127 indicates that no OC is available.

7. For details of the Conversion Method (CM) refer to J1939-73 section 5.7.1

 

Registers

Register offset Name Minimum value Maximum value Scaling factor Units Bits/ Sign
0 Number of active trouble codes 0 126     16
1 Reserved 0 0     16
2 Reserved 0 0     16
3 Reserved for SAE assignment 0 3     15/16-16/16
  Reserved for SAE assignment 0 3     13/16-14/16
  Reserved for SAE assignment 0 3     11/16-12/16
  Reserved for SAE assignment 0 3     9/16-10/16
  Protect lamp status 0 3     7/16-8/16
  Amber warning lamp status 0 3     5/16-6/16
  Red stop lamp status 0 3     3/16-4/16
  Malfunction indicator lamp status 0 3     1/16-2/16
4 Trouble code 1: Least significant 16 bits of SPN 0 65535     16
5 Trouble code 1: CM 0 1     16/16
  Trouble code 1: OC 0 127     9/16-15/16
  Trouble code 1: FMI 0 31     4/16-8/16
  Trouble code 1: Most significant 3 bits of SPN 0 7     1/16-3/16
6-7 Trouble code 2 as above          
8-9 Trouble code 3 as above          
10-255 Trouble codes 4-126 as above          

 

Lamp status codes

Code System control function
0 Lamp off
1 Lamp on
2 Undefined
3 Unimplemented

 

 







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