Honda Civic Service Manual page 305

PGM-FI System
MIL Circuit Troubleshooting (cont'dl
1 1 .
Try to start the engine.
Does the engine start?
Y E S - G o t o s t e p 1 1 .
N O - G o t o s t e p 1 4 .
Turn the ignition switch OFF.
Connect ECM connector terminal E31 to body
ground with a jumper wire.
1 0 .
12.
ECM CONNECTOR E 13lPI
MIL
(GRN/ORN}
Wire side of female terminals
Turn the ignition switch ON (ll).
ls the M lL on?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 1 1-6). lf the symptom/indication
goes away with a known-good ECIM, replace the
o r i g i n a l E C M . I
NO-Check for an open in the wire between the
E C M ( E 3 1 ) a n d t h e g a u g e a s s e m b l y . A l s o c h e c k f o r
a b l o w n M I L b u l b . l f t h e w i r e s a n d t h e b u l b a r e O K ,
replace the gauge assembly.l
Turn the ignltion switch OFF,
Inspect the No. 6 ECU (ECIM) (15A) fuse in the
under-hood fuse/relay box.
ls the f use OK?
YES-Go to step 22.
N O - G o t o s t e p 1 6 .
't 4.
1 5 .
l l 2 l 3
4
5
6 1 7 l 1 8
I
4 1 5
161,/ 118
2( 2t
2' 23 24
z7l/ 129
31
JUMPER
WIRE
1 1 - 9 8
t o .
Remove the blown No. 6 ECU {ECfU) (154) fuse
from the under-hood fuse/relay box.
Remove the glove box (see page 20-63) and the
P G M ' F I m a i n r e l a y 1 .
Check for continuity between body ground and
P G M - F l m a i n r e l a y 1 4 P c o n n e c t o r t e r m i n a l s N o . 2
a n d N o . 4 i n d i v i d u a l l v .
PGM-FI MAIN RELAY 1
4P CONNECTOR
W r r e s r d e o l l e m a l e t e r m r n a l s
ls there continuity?
Y E S - R e p a i r s h o r t i n t h e w i r e b e t w e e n t h e N o . 6
E C U ( E C l \ 4 ) ( 1 5 A ) f u s e a n d t h e P G M - F l m a i n r e l a y 1 .
A l s o r e p l a c e t h e N o . 6 E C U ( E C M ) ( 1 5 A ) f u s e . l
N O - G o t o s t e p 1 9 .
1 7 .
1 8 .
f V B
v)
(wHr/
IA
BLK)(