JLG 450A_AJ Series II Service Manual - Manual (Page 150)

SECTION 3 - CHASSIS & TURNTABLE
3-110 – JLG Lift – 3121290
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 Protocol (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 “Recommended Practice
for Diagnostic Trouble Code Definitions” (SAE J2012). While
these codes are recommended, customers 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 connect 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 Diagnostic 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 applica-
tion and engine calibration. There are 4 CAN SPN/FMI lists
available in the DGC software 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 fol-
lowing bytes are supported for DM4 if configured in ECM soft-
ware:
• Byte 1: Freeze Frame Length
• Byte 2-6: SPN, FMI, SPN Conversion Method, and Occur-
rence
• 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 diag-
nostic action as defined in the calibration. Lamps are assigned
based on configuration outlined in Table 3-15.
MIL Output
Malfunction Indicator Lamp (MIL) output displays fault infor-
mation 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.”
Diagnostic Calibration Configuration and
Corrective Actions
Each fault within the DGC is capable of being uniquely config-
ured in the engines diagnostic calibration to cause one or
more corrective actions while a given fault is active.
Table 2 identifies configuration options and corrective actions
available for configuration of each fault.
Table 3-15. 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)