a. Turn engine rpm dial from slow idle to fast idle,
b. Push E mode switch,
c. Push auto-idle switch; wait approximately 4
d. And then turn engine rpm dial to slow idle.
EC motor (D) must move the speed control linkage to
each position. Indicators must be ON and change
randomly from bright to dim or dim to bright as engine
rpm dial and switches are pushed to indicate there is
continuity in the wiring harness and there is a signal
from the engine and pump controller (EPC).
If one indicator is OFF, check continuity in that circuit.
If both indicators are OFF, check the wiring harness
and relay. (See procedure in Group 9015-15.)