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CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
1.3
1.3
How
How to to cle
(1) Open
(1)
Open-circ
-circuits ar
connectors and components. Dust together with
connectors and components. Dust together with
greasy matter forms grime which, in time, penetrates
greasy matter forms grime which, in time, penetrates
electrical connections, resulting in loose metal-to-metal
electrical connections, resulting in
contact or, in the worst case, electrical separation of
contact or, in the worst case, electrical separation of
surfaces in contact. For this reason, it is essential that
surfaces in contact. For this reason, it is essential that
the connectors and components be cleaned at each
the connectors and components be cleaned at each
periodic inspection and at when servicing the truck.
periodic inspection and at when servicing the truck.
Instead of a commonly used solvent, use electronic
Instead of a commonly used solvent, use electronic
parts cleaner (in the manner illustrated on the right).
parts cleaner (in the manner illustrated on the right).
Note: The cleaner liquid is volatile (evaporates by itself).
Note: The cleaner liquid is volatile (evaporates by itself).
All that is required is to throughly wash off the grime with the spray.
All that is required is to throughly wash off the grime with the spray.
No need to wipe off
No need to wipe off the sprayed liquid.
(2)
(2) Afte
After chec
r checking the c
shown. Then, uncouple the connector and spray
shown. Then, uncouple the connector and spray
contact surface activator onto contact surfaces. Install
contact surface activator onto contact surfaces. Install
and remove the connector several times to wet the
and remove the connector several times to wet the
surfaces thoroughly with the activator liquid. After
surfaces thoroughly with the activator liquid. After
coupling up the connector, check to be sure that it is in
coupling up the connector, check to be sure that it
locked state.
locked state.
Note: Do not spray
Note: Do not spray too much liquid into the connector.
Cleaner liquid reacts differently with some resins (plastic materials).
Cleaner liquid reacts differently with
clean
an har
harnes
ness c
s conn
onnect
ectors
uits are ofte
e often cause
n caused by dirt
d by dirty harne
loose metal-to-metal
Electronic parts cleaner
Electronic parts cleaner
Three Bond 29B
Three Bond 29B
the sprayed liquid.
king the conne
onnector fo
ctor for conti
r continuity, w
nuity, wash it as
Contact surface activator
Contact surface activator
Three Bond 2501S (
Three Bond 2501S (aerosol)
aerosol)
too much liquid into the connector.
some resins (plastic materials).
1 1 . . E E r r r r o o r r c c o o d d e e d d i i s s p p l l a a y y
ors and
and sy syste
stem c
m comp
ompone
onents
y harness ss
1. 1. Elect
Electronic pa
ronic parts clea
ash it as
is in
1) 1) C C on
onta tact ct su
sur r fa fac c e a
2 2 . . C C u u p p h h o o l l d d e e r r
nts
rts cleaner
ner
1
1
1)
1)
e act cti i va
vato tor r
1 1 . . El Elec
ectr tron
oni i c p
c par arts ts cl clea
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2-1
1
1
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