Acura 2002 RSX Service Manual page 1328

Multiplex Gontrol System
Troubleshooting (cont'd)
'Before
replacing a Faulty ECM/PCM make sure it
has the latest software revision. UDdate if
necessary before swapping or replacing.
Individual DTCs
Multiplex
DTC
Probable Cause
T h e m u l t i p l e x c o n t r o l u n i t
cannot receive signals from
t h e g a u g e a s s e m b l y .
1 . F a u l t y p o w e r o r g r o u n d
to the gauge assembly
2 .
F a u l t y g a u g e a s s e m b l y
3. Faulty u nder'dash fuse/
relay box
,)
T h e m u l t i p l e x c o n t r o l u n i t
cannot receive signals from
thE ECMi PCM
1. Faulty power or ground
to the ECM/PCM
2 .
F a u l t y E C M " / P C M
3. Faulty under-dash fuse/
relav box
I n t e r n a l f a i l u r e o f t h e
multiplex control unit
1. Faulty under-dash fuse/
retav Dox
5 The gauge assembly cannot
receive signals from the ECM/
P C M
1. Faulty power or ground
to the ECM/PCM
2.
Faulty qauqe assemblv
6
The ECM cannot receive
s i g n a l s f r o m t h e m u l t i p l e x
c o n t r o l u n i t a n d t h e g a u g e
a s s e m o r y
1 . F a u l t y p o w e r o r g r o u n d
to the ECM/PCM
2 . F a u l t v q a u o e E C M ' / P C M
22-176
DTCs
Mulliplex
DTCs
Probable Cause
1 , 2 a n d 3
&
ECM DTC
P0600
S i m u l t a n e o u s l y
Short to ground on one of the
c o m m u n i c a t i o n w i r e s .
1 . S h o r t t o g r o u n d o n t h e
YEL wire between the
ECM/PCM terminal E24
and the under-dash fuse/
r e l a y b o x t e r m i n a l E 1 0
2.
Short to ground on the
WHT/GRN wire between
the Gauge assembly
t e r m i n a l B l 3 a n d u n d e r -
dash fuse/relay box
t e r m i n a l K 1 0
1 a n d 6
S i m u l t a n e o u s l y
O p e n i n t h e c o m m u n i c a t i o n
w i r e
1. Open in WHT/GRN wire
between the under-dash
fuse/relay box terminal
K 1 0 a n d t h e G a u g e
a s s e m b l v t e r m i n a l 8 1 3
2 a n d 5
S i m u l t a n e o u s l y
O p e n i n t h e c o m m u n i c a t i o n
1 , O p e n i n t h e Y E L w i r e
between the under-dash
fuse/relay box terminal
E 1 0 a n d E C M / P C M
t e r m i n a l E 1 0 a n d E C M /
PCN4 terminal E24