Engine-To-Firewall Wiring Harness Installation - Lycoming TEO-540-C1A Maintenance Manual

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual

12. Engine-to-Firewall Wiring Harness Installation

CAUTION USE CAUTION AROUND THE WIRING HARNESS, SENSORS AND
ACTUATORS. THEY CAN BE EASILY DAMAGED AND CANNOT BE
REPAIRED. IF ANY OF THESE ITEMS ARE DAMAGED, THEY MUST BE
REPLACED. IF ONE WIRE BREAKS ON THE WIRING HARNESS, THE
COMPLETE HARNESS WILL NEED TO BE REPLACED.
NO EECS PARTS OR HARNESS CAN BE INTERCHANGED BETWEEN
ENGINES UNLESS AGREED UPON BY LYCOMING ENGINES.
NOTICE: All the plugs on the wiring harness are uniquely keyed and must be in the correct
orientation for the plug to install correctly in the receptacle. Refer to Appendix B in this
manual.
NOTICE: This procedure can be done with the engine installed in the airframe.
Remove protective caps before making any wiring harness connections.
A. Ensure power is off.
B. Ensure EECS/ECU breaker is pulled to disconnect power.
C. Put the engine-to-firewall wiring harness on the engine as shown in Figures 41 and 42.
CAUTION
D. If a new harness is being installed, remove the screws, lock nuts, bolts and screws, and
labeled clamps from the old wiring harness one at a time. Discard the lock nuts.
E. Install the left and right side harness brackets (Figures 41 and 42) on respective sides of the
engine-to-firewall harness with the attaching screws, washers, and new lock nuts. Torque the
hardware as per the Standard Torque Tables in the latest revision of the Service Table of
Limits - SSP-1776.
CAUTION
G. Install each harness actuator connector in its corresponding actuator connection.
NOTICE: Refer to "Sensor Replacement Procedures" in this chapter to ensure the correct
wiring harness lead is connected to its corresponding sensor.
Refer to Table 2 - Wiring Harness Connector Guidelines, in this chapter, when
connecting the wiring harness to the engine sensors.
H. Install each harness sensor connection in its corresponding sensor connection.
I. Install each harness coil connection in its corresponding coil connection.
J. Install the coil box cover. Refer to the section "Coil Box Access" in Chapter 74-30.
© 2018 Avco Corporation. All Rights Reserved
November 2018
THE HARNESS HAS DIFFERENT DIAMETERS AT VARIOUS
LOCATIONS. CLAMPS ARE SIZED SPECIFICALLY FOR EACH AREA
ON THE HARNESS. IF A NEW HARNESS IS TO BE INSTALLED,
REFER TO THE LOCATION OF EACH CLAMP ON THE OLD HARNESS
FOR INSTALLATION ON THE NEW HARNESS. ALL OF THE CLAMPS
MUST BE INSTALLED IN THE CORRECT LOCATION ONE AT A
TIME.
USE CAUTION WHEN TOUCHING THE SENSORS AND ACTUATORS.
THEY CAN BE EASILY DAMAGED. NONE CAN BE REPAIRED. IF
ANY OF THESE ITEMS ARE DAMAGED, THEY MUST BE REPLACED.
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