Honda Civic Service Manual page 328

DTC P0340: CMP Sensor A No Signal
DTG P0344: CMP Sensor A Intermittent
Interruption
1 . R e s e t t h e E C M ( s e e p a g e
' 1 1 - 4 ) .
2. Start the engine.
ls DTC P0340 and/or P0344 indicated?
YES-Go to step 3.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
t h e C M P s e n s o r A a n d a t t h e E C M . I
3. Turn the ignition switch OFF.
4. Disconnect the CMP sensor A 3P connector.
5 . T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
6. Measure voltage between CMP sensor A 3P
connector terminal No. 3 and body ground.
CMP SENSOR A 3P CONNECTOR
(BLK/YEL}
Wire side of female terminals
ls there battety voltage?
YES Go to step 7.
N O C h e c k t h e N o . 4 A C G { 1 0 A ) f u s e i n t h e u n d e r -
dash fuse/relay box. lf the fuse is OK, repair open in
the wire between the CN4P sensor A and No. 4 ACG
( 1 0 A ) f u s e . I
t G 1
1
2
3
7. Measure voltage between CMP sensor A 3P
connector terminal No. 1 and body ground.
CMP SENSORA 3P CONNECTOR
W i r e s i d e o l f e m a l e t e r m i n a s
ls therc about 5 V?
YES-Go to step 8.
NO-Go to step 10.
8. Measure voltage between CMP sensor A 3P
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 . 3 .
CMP SENSOR A 3P CONNECTOF
;f-;-1
,o, ,r.*,"r.,
I l 1 J l - t
,-or---T--I
{8RN/YEL) ni-
ls there battety voltage?
YES Go to step 9.
NO-Repair open in the wire between the Cl\4P
s e n s o r A a n d G 1 0 1 . 1
9. Substitute a known-good CMP sensor A and
recheck.
ls DTC P0340 and/ot P0344 indicated?
YES 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, replace the
o r i g i n a l E C M . I
N O R e p l a c e t h e o r i g i n a l C M P s e n s o r A { s e e p a g e
1 1 - 1 2 8 ) . t
(cont'd)
11-121