Interpreters Document


Typical Interpreter Line: (all Action and Goto fields are hex numbers)



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dps Interpreters

Typical Interpreter Line: (all Action and Goto fields are hex numbers) 
Step 
Op-Code 
Action Fields
Goto Fields 
10 
11 
01 00 00 00 
51 11 FF 2D 00 00 00 00 00 00 
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Page
114 
14 Op-Code: SR 14 Clear Diagnostic Trouble Codes 
 
Supported By:
KWP2000 Interpreter 2
 
 
Description: 
The 14 Op-Code is used to issue a Clear DTCs Service Request. The group of diagnostic information selects 
which DTCs shall be cleared. The below values are defined in the document "SAE Recommended Practice 
J2012" section "Diagnostic Trouble Codes" 
Group of diagnostic information 
Description 
$0000 
All powertrain DTCs
$0001 - $3999 
Specific powertrain DTCs 
$4000 
All chassis DTCs 
$4001 - $7999 
Specific chassis DTCs 
$8000 
All body DTCs 
$8001 - $B999 
Specific Body DTCs 
$C000 
All undefined DTCs 
$C001 - $C999 
Specific undefined DTCs 
$FF00 
All DTCs 
Action Fields: 
AC0: Group of diagnostic information (high byte)
AC1: Group of diagnostic information (low byte) 
AC2: $00 - Not used
AC3: Exceptions: $00 
– Not used
Pseudo Code: 
XX 14 AC0 AC1 AC2 AC3 G0-G1 G2-G3 G4-G5 G6-G7 G8-G9 
Use KWP2000 Normal Response processing
Build Clear DTCs Service Request as indicated in the table below 
Request 
Byte 
Value 
Byte Description 

80 
Format byte for physical addressing 

## 
Global target byte 

## 
Global source byte 

03 
Length of request from byte 5 up to checksum (not included) 

14 
Clear DTCs service ID

AC0 
Group of diagnostic information (high byte)

AC1 
Group of diagnostic information (low byte) 

CS 
1 byte message checksum 
Calculate checksum and copy into service request (byte 7) 
Send Clear DTCs Service Request and receive response (up to 10 Bytes) 
Goto KWP2000 Response Processing
If ECU Reset Service positive response is received 
Look for ECU Reset Service positive response service ID ($50) in goto fields 
Else
Look for ECU Reset Service negative response, response code in goto fields 
Endif
If found
Goto appropriate step
Else 
Goto step indicated by FF goto field 
Endif 

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