JLG 450A_AJ Series II Service Manual - Manual (Page 205)

SECTION 3 - CHASSIS & TURNTABLE
3121180 – JLG Lift – 3-155
Fault Code Broadcast
All diagnostic trouble codes are broadcast through EDIS
for display on a PC. EDIS can acquire the data from the
ECU via CAN using the EControls Inc. Proprietary Proto-
col (ECIPP). Faults may also be acquired over the CAN
network through CAN J1939-based scan tools or multi-
function display units.
Diagnostic Trouble Codes
Numeric diagnostic trouble codes assigned to faults in
this manual are cross-referenced to SAE.s “Recom-
mended Practice for Diagnostic Trouble Code Definitions”
(SAE J2012). While these codes are recommended, cus-
tomers may define their own codes by assigning a new
number to the flash code in the diagnostic calibration.
This assigns the DTC as displayed in EDIS and flash code
output on the MIL output pin. EDIS may be used to con-
nect to the DGC ECM via CAN.
CAN
The DGC supports SAE J1939 CAN based diagnostic
support. This includes:
• DM1: Active Diagnostic Trouble Codes
• DM2: Previously Active Diagnostic Trouble Codes
• DM3: Diagnostic Data Clear/Reset of Previously Active
DTCs
• DM4: Freeze Frame Parameters
• DM5: Diagnostic Readiness (bytes 1, 2, and 3 are sup-
ported)
• DM11: Diagnostic Data Clear/Reset For Active DTCs
• DM12: Emissions-Related Active Diagnostic Trouble
Codes
• DM19: Calibration Information
All diagnostic trouble codes broadcast over CAN are SAE
J1939 DM1 and DM2 formatted messages. DGC ECMs
are compliant with J1939 OBD-M, supporting the Diag-
nostic Messages above as well as user indicators and
CAN data defined in the OBD-M protocol. Faults available
for broadcast and their respective SPN/FMI numbers are
dependent on the application and engine calibration.
There are 4 CAN SPN/FMI lists available in the DGC soft-
ware set, contact EControls Inc. for a list of CAN SPN/
FMIs.
Data capture at occurrence of a fault, known in the ECM
as fault snapshot (FSS), is available upon DM4 request.
The following bytes are supported for DM4 if configured in
ECM software:
• Byte 1: Freeze Frame Length
• Byte 2-6: SPN, FMI, SPN Conversion Method, and
Occurrence
• Byte 7: Manifold Absolute Pressure
• Byte 8-9: Engine Speed
• Byte 10: Engine Load (MAP based estimate)
• Byte 11: Engine Coolant Temperature
• Byte 14: # of starts since fault was last active
• Byte 15: Index into FSS_storage table for Fault Snap
Shot retrieval
Resetting active and previously active DTCs is handled
through DM11 and DM3, respectively DM1 and DM2 lamp
indicators are assigned to each fault based on the faults
diagnostic action as defined in the calibration. Lamps are
assigned based on configuration outlined in Table 3-17.
MIL Output
Malfunction Indicator Lamp (MIL) output displays fault
information to the equipment operator. The MIL is always
on (grounded) when the system is in a key-on (Vsw),
engine-off state. This shows the output is functional. If a
DTC is logged as previously-active (historic), the MIL
sends a single flash for the “Blink on-time” every “Blink
off-time.”
Table 3-17. J1939 Diagnostic Lamp Configuration
ECI DIAGNOSTIC ACTION J1939 LAMP
MIL MIL
Soft Warning Amber
Hard Warning, Low Rev Limit,
Shutdown
Red Stop
Power Derate 1 & 2 Protect
Forced Idle
None (use in combination with
other action)