JLG 450A_AJ Series II Service Manual - Manual (Page 190)

SECTION 3 - CHASSIS & TURNTABLE
3-150 – JLG Lift – 3121290
DTC 1612- Microprocessor Failure - RTI 1
• Engine Control Module.
• Check Condition- Key on.
• Fault Condition- Internal microprocessor error.
• MIL- On until code is cleared by technician.
• Adaptive- Disabled for the remainder of the key-on cycle.
• Closed Loop- Enabled.
• Power Derate (level 2 until fault is cleared manually).
The ECM has checks that must be satisfied each time an
instruction is executed. Several different things can happen
within the microprocessor that will cause this fault. The ECM
will reset itself in the event this fault is set, and the MIL will be
on until the code is cleared. This fault should be erased after
diagnosis by removing battery power. It will not self-erase.
• During this active fault, Power Derate (level 2) is enforced
and maximum throttle position is 20%. This is enforced
until fault is manually cleared.