Service Manual Manual

SECTION 3 - CHASSIS & TURNTABLE
3-204 – JLG Lift – 3120788
DTC 1629- J1939 TSC1 Message Reciept
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
will govern the engine speed to this 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 oth-
erwise.
This fault will set 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 the diagnostic calibration).
Diagnostic Aids
• Verify that that the CAN device generating the TSC1
message is powered and properly grounded
• Verify that the 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