JLG 450A_AJ Series II Service Manual - Manual (Page 204)

SECTION 3 - CHASSIS & TURNTABLE
3-164 – JLG Lift – 3121290
DTC 1629- J1939 TSC1 Message Receipt Loss
• Controller Area Network.
• Check Condition- Key On, Engine Running.
• Fault Condition- ECM is expecting to receive J1939 TSC1
messages and has not received a message for more than n
seconds (as defined in the diagnostic calibration).
• Corrective Action(s)- Illuminate MIL, sound audible warn-
ing or illuminate secondary warning lamp. Govern engine
speed at a forced idle.
• Non-emissions related fault.
J1939 TSC1 may be used to send a commanded (or desired)
engine speed to the ECM. If configured, the ECM governs
engine speed to commanded speed if possible. When operat-
ing in this mode, the ECM expects to receive TSC1 messages
on a regular interval. When this message is not received, the
ECM must operate the engine at a default idle speed until
commanded to do otherwise.
This fault sets if CAN communication is enabled, the engine is
running, and no TSC1 messages are received over the CAN bus
for more than n seconds (as determined by diagnostic calibra-
tion).
DIAGNOSTIC AIDS
• Verify CAN device generating the TSC1 message is pow-
ered and properly grounded.
• Verify CAN network is properly terminated.
• Check CAN wire routing with respect to noise sources (igni-
tion coils, spark plug coil wires, etc.) and shield if necessary.
• Check CAN (+) and (-) wires for short circuits.