Civil Engineering Reference
In-Depth Information
Table 4.20
Relation of emission-based diagnostics standards
ISO 15031-5
ISO 27145-3
SAE J1939-73
US10
SAE J1939-73
EURO VI
Request data
stream
Service $ 01
Service $ 22
SPNs + DM21,
DM5, DM 26,
DM32, DM33,
DM34
Request freeze
frame
Service $ 02
Service $ 19 04
DM25
Request pending
DTCs
Service $ 07
Service $ 19 42
DM6
DM41, DM44,
DM47, DM50
Request confirmed
DTCs
Service $ 03
Service $ 19 42
DM 12
DM42, DM45,
DM48, DM51
Request permanent
DTCs
Service $ 0A
Service $ 19 55
DM28
Request previous
DTCs
Service $ 19 42
DM23
DM43, DM46,
DM 49, DM52
Clear DTCs
Service $ 04
Service $ 14
DM 11
DM11
Request test results Service $ 06
Service $ 22
DM7, DM30
DM7, DM30
Command test
Service $ 08
Service $ 31
DM8
DM8
Request infoType
DM 19, DM20,
+SPN
Note: ISO 15031-5 (SAE J1979) is allowed for legislated OBD communication for HDVs in the
USA and for HDVs until Euro VI legislation in Europe. It uses Service $ 01-0A for retrieving the
legislated communication. ISO 14229-1 (ISO 15765-3 DoCAN) is used for enhanced diagnostics
in both passenger cars and some HDVs. The Euro VI column shows that there is a different set of
DMs for fulfilling Euro VI legislation
Service $ 09
Service $ 22
DM 19, DM20,
+SPN
could detect a failure during some conditions. The TestValues will usually differ
each time the monitor is executed since they are affected by component deviation,
component ageing and also driving and environmental conditions.
4.4.5.2
Scan Tool Initialization
The scan tool initialization procedure is easier than for a scan tool for ISO 15765-4
since there is currently only one allowed bus speed, 250 kbps and all Electronic-
ControlUnits shall utilize 29-bit CAN identifiers.
First, the tool will check for PGN 61444 EEC1 which is always transmitted
if there is an engine ElectronicControlUnit on the network. Then it will send a
DM5 Diagnostic Readiness 1 request as a BAM request. All ECUs that utilize SAE
J1939-73 will respond with the information of, e.g. the number of active DTCs, the
number of previously active DTCs, the monitor groups that have executed since last
clear DTC and the OBD compliance (similar to PID $ 1C of ISO 15031-5).
It is possible that vehicles prior 2010 in the USA do not utilize SAE J1939-73 for
diagnostic communication, and in Europe it is quite common to use SAE J1939-71
