Service Manual Manual

SECTION 3 - CHASSIS & TURNTABLE
3-146 – JLG Lift – 3120788
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
The numeric diagnostic trouble codes assigned to the
faults in this manual are cross-referenced to SAE.s "Rec-
ommended Practice for Diagnostic Trouble Code Defini-
tions" (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 calibra-
tion. This will assign both the DTC as displayed in EDIS as
well as the 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 will be
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 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.
The data capture at the 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 con-
figured in the 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 fault.s
diagnostic action as defined in the calibration. The lamps
FSS Fault Snapshot WGP Waste-Gate Pressure
FT Fuel Temperature
GCP Global Control Platform
HDGCP
Heavy-Duty Global Control Platform
(On-Road Heavy-Duty)
HEGO Heated Exhaust Gas Oxygen Sensor (same as HO2S)
HO2S Heated Oxygen Sensor (same as HEGO)
IAC Idle Air Control
IAT Intake Air Temperature
ICAV Instant Crank Angle Velocity
IVS Idle Validation Switch
LDGCP
Light-Duty Global Control Platform (Industrial, Smart/
Logic Coil)