Honda Civic Service Manual page 418

PGM-FI System
Primary Heated Oxygen Sensor (Primary HO2SI (sensor l)
(Dl6Y5 engine with M/T) (cont'd)
( F r o m p a g e 1 l - 1 4 7 )
( F r o m p a g e 1 1 1 4 7 )
( T o p a g e 1 1 1 4 9 )
{GRN/BLK}
(GRN/8I-K}
( T o p a g e 1 1 - 1 4 9 )
11- 1 4 8
Substitute a known-good ECM
and rechock. tf symptom/indicr-
tion goes away, replace the origi-
n a l E C M .
Check for a short in the wire llP+
lin6):
1. Disconnect the 8P connector
Irom the Primary HO2S (Sen-
s o r 1 ) .
2. Check tor continuity between
body ground and ECM connec-
tor terminal C25.
Repair short in the wiro botween
the Primarv HO2S {Sensor 1} and
ECM {C25}.
Replace th€ Primary HOzS {Sen-
sor 11.
| 2 3 r a
1 a
9
t o
t l 1 2
t 5 1 6 1 1 1 a
p ffi;r, w''.""i0"or.
I l e m a t e l e r m l
ls there more than 5.0 V?
check the EcM:
1. Turn the ignition switch OFF.
2. Disconnect the 8P connector
from the Primary HO2S (Sen-
sor 1).
3. Turn the ignition switch ON (ll).
4. Measure voltage between ECN4
connector C25 and D11.
ls there more than 5.0 V?
Check the ECM input voltage llP-/
vS-linel:
1 . S t a r t t h e e n g i n e . H o l d t h e
engine at 3,000 rpm with no
load (transmission in neutral)
untilthe radiator fan comes on,
then let it idle.
2. Measure voltage between ECM
connector terminals C24 and
D t 1 .
Subslitute a known-good ECM
and rgcheck. It symptom/indica-
tion goes away, repl.ce the origi-
nal ECM.
ls there 2.6 2.8 V?
Check th6 ECM output voltage
(VS+ linel:
Measure voltage between ECM
connector terminals C25 and D11.
7
a 9
t 0
I t 1 2 t 3
t 6 '11
t a
VS+
{WHT}
sG2
2 3
5
,
9 , 1 0 1 l
12
l 3
'ta t 5
15
1
2 i 3
5
a 9
t 0
't2 'tt
t 5 t t
r l
22
VS+
{WHT)
sG2
2 3
6 l t 9
l l
13
15