Chapter 3 Repair of Electronic Control Unit

TM 5-6675-250-34

CHAPTER 3

REPAIR

ELECTRONIC

CONTROL

UNIT

a. Removal.

3-1. General

(1) Press the pressure relief valve on the case to

The ECU consists of a control panel assembly with

relieve internal pressure.

related electronic parts, installed in a portable case.

(2) Unlatch and separate the lid from the bottom

When connected to the GRU and electric power

section.

s o u r c e , the ECU provides controls and instruments

(3) Loosen the eight captive screws and lift the

f o r operating and testing the GRU.

electronic control panel assembly from the case (fig.

R e p a i r of the ECU consists of replacing defective

3-1).

components. Refer to troubleshooting procedures

b . Installation.

(table 2-1) and failure analysis (para 2-16) to isolate

(1) Position

the

electronic

control

panel

defective

components.

assembly in the case and tighten eight captive

3-2. Electronic Control Panel Assembly

screws.

Repair of the electronic control panel assembly

(2) Secure the lid onto the bottom section of the

consists of replacing defective components

case.

authorized by the MAC. Procedures for removal and

installation of components are described in following

paragraphs.

3-1