Honda EP3 Service Manual page 324

19. Disconnect each of the components or the
connectors below, one at a time, and check for
continuity between PGM-FI main relay 1 4P
connector terminal No. 1 and body ground.
. PGfvl-Fl main relay 2
. ECM connector A (31P)
. Each injector 2P connector
. ldle air control (lAC)valve 3P connector
. Camshaft Position (CMP) sensor B (Top dead
center (TDC) sensor) 3P connector
. Crankshaft position (CKP) sensor 3P connector
PGM-FI MAIN RELAY 1
4P CONNECTOR
ls thete continuity?
YES Go to step 20.
NO- Replace the component that made continuity
to body ground go away when disconnected. lf the
item is the ECM, update the ECM if it does not have
the latest software. or substitute a known-good
ECM, then recheck (see page 11-6). lf the symptom/
indication goes away with a known'good ECM,
r e p l a c e t h e o r i g i n a l E C M .
Also replace the No. 6 ECU (ECM) (15 A) fuse,
Disconnect the connectors of all these components.
. P G M - F l m a i n r e l a y 2
. E C M c o n n e c t o r A ( 3 1 P )
. lnjectors
. l d l e a i r c o n t r o l ( l A C ) v a l v e
. Camshaft Position {CMP) sensor B (Top dead
center (TDC) sensor)
. Crankshaft position (CKP) sensor
20.
Wire side of female terminals
22.
21. Check for continuity between PGM-FI main relay 1
4P connector termlnal No. 1 and body ground.
PGM-FI MAIN RELAY 1
4P CONNECTOR
ls there continuity?
YES Repair short in the wire between the PGM-Fl
main relay 1 and each item. Also replace the No. 6
E C U { E C M ) ( 1 5 A ) f u s e . l
N O - R e p l a c e 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 I M ) ( 1 5 A ) f u s e . I
I n s p e c t t h e N o . 1 7 F U E L P U I \ 4 P ( 1 5 A ) f u s e i n t h e
under-dash f use/relay box.
ls the tuse OK?
YES Go to step 34.
NO Go to step 23.
R e m o v e t h e b l o w n N o , 1 7 F U E L P U M P ( 1 5 A ) f u s e
from the under-dash fuse/relay box.
Disconnect ECfvl connector E (31P).
( c o n r ' d )
23.
2 4 .
Wire side of female terminals
1 1 - 9 9