TROUBLESHOOTING 777 SERVICE MANUAL
10-8 Published 10-01-2012, Control # 045-08
Problem 6
Engine will not go to high idle.
POSSIBLE CAUSES
No signal from hand or foot throttle; No power to control module;
Engine speed sender is damaged; Lack of supply fuel.
Check for 12 volts DC at electronic fuel control
module or engine control module. (See Test 22.)
12 Volts DC
Check for 500 ohms at hand or foot
throttle potentiometer.
Yes
No
Replace hand or foot
throttle potentiometer
Repair or replace wiring, EFC
module or data link connector.
Check or replace engine transducer or wiring.
Check wiring to and from EFC
acturator or data link connector.
Check for 2 volts AC or more at TB1-5 and TB1-6 (TB1-C and
TB1-D on C-260 Engine) on engine control module.
Yes No
Check wiring.
CHECKS
Do hand and foot throttle operate correctly?
Yes
No
No Volts
Check relay operation.
Check for voltage at TB1-3 and TB1-4 (TB1-A and TB1-B
on C-260 Engine) on engine control module.
Yes No
No
Repair or replace acturator.
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