JLG 450A_AJ Series II Service Manual - Manual (Page 258)

SECTION 3 - CHASSIS & TURNTABLE
3-208 – JLG Lift – 3121180
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 cali-
bration).
• Corrective Action(s)- Illuminate MIL, sound audible
warning 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 operating 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 calibration).
DIAGNOSTIC AIDS
• Verify CAN device generating the TSC1 message is
powered and properly grounded.
• Verify CAN network is properly terminated.
• Check CAN wire routing with respect to noise sources
(ignition coils, spark plug coil wires, etc.) and shield if
necessary.
• Check CAN (+) and (-) wires for short circuits.