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GAP Diagnostic 2023-09-12 All Rights Reserved
User Manual G3 units: Version 37, Firmware V4.0
4.3.2 Faults decoding
Fault codes shown by the IIDTool are based in part on the list of DTC Fault codes (Data Trouble Code)
from the ISO 15031 standard specification*. These standardized codes are complemented by Jaguar
Land Rover’s manufacturer specific codes. The IIDTool decodes fault codes and provides the descrip
-
tion. Here’s the structure:
*
L322-02, L322-06 and L316
, some ECUs do not respect this standard.
Structure of Fault codes provided by the IIDTool
The code consists of four (4) distinct elements sometimes followed by a textual definition referring to
one of the elements (Def):
Code
Structure
– Axxxx – xx
– (xx)
abcdef
– abcdef
Code
Element
1
st
2
nd
3
rd
Definition of 1
st
Definition of 2
nd
Example
C1A27
11
58
Compressor Circuit General electrical failure,
short to ground
Table 18.
Structure of Fault codes provided by the IIDTool
Note
:
L322-02, L322-06 and L316, some ECUs do not follow this nomenclature.
Code Elements
1
st
Element :
Alphanumeric code of 5 characters, standardized DTC (Data Trouble Code).
Definition
The textual definition of the second element is located after the 4th element of the fault code provided
by the IIDTool.
Structure of the 1
st
element (Example : A xxxx)
1
st
character : Letter indicating the system on which the fault relates to (see table on next page)
2
nd
character : Fault code origin (optional information), 0=from the ISO standard, 1=manufacturer
specific
3
rd
character : Subset showing the fault subsystem (see table on next page, code P only)
4
th
at 5
th
character : Defective component and nature of the fault
