Honda Civic Service Manual page 1589

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Alternator Control System Test {USA}:
'99 - 0O models, except Dl6Y5 {M/T} engine
NOTE: Before testing, check proper operation ofthe ELD by confirming with the
MIL (see section 11)'
BATTERY
CAUTION: Be sura lo use a voltmeter
with its plus te.minal conneqted io bat-
tery plus and it3 minus tgrminal to ths
4P connoctot tomrinal No. 2.
Wire side of
female terminals
c
(WHT/GRNI
wire side of
female terminals
ALTERNATOR
.P CONNECTOR
ECM/PCM CONNECTOR C 13lPI
ECM/PCM CONNECTOR C (31PI
(cont'd)
23-117
Check lor a sho.t in the circuit
{ALTC line):
1, Beconnect the 4P connector
to the alternator.
2. Start the engine, and turn the
headlights (high beam) ON.
3. Measure voltage between the
4P connector terminal No. 2
a n d t h e P o s i t i v e t e r m i n a l o f
the battery.
ls there 1 V or less?
Chcck for rn opon in the wire
(ALTC lin6l:
1 . T u r n t h e h e a d l i g h t a n d i g n i -
tion switch OFF
2. Disconnect the 31P connector
trom the ECM/PCM.
3. Check for continuity betlveen
the ECM/PCM 31P connector
terminal No. 2 and alternator
4P connector terminal No. 2
Repair opcn in the wire botweon
the alternstoi.nd ECM/PCM.
ls there continuity?
Check tor short in the wire IALTC
line):
1 . T u r n t h e h e a d l i g h t a n d i g n i -
tion switch OFF
2. Disconnect the 31P connector
from the ECM/PCM.
3. Check for continuity between
the ECM/PCM 31P connector
t e r m i n a l N o . 2 a n d b o d y
ground.
Substitute a known'good ECM/
PCM, and recheck.
It prscribed voltagg is now avail'
abl€, replace tho original ECM/
PCM.
Raoair short in the wite between
the alle.nator and ECM/PCM,
1
2
3
5 6 1
8 I 10
/116 1 1
l o
191 zo
21 22
23
25 26 21
?8 2930
J I
ALTC
Wire side of
( W H T / G R N ) f e m a l e t e r m i n a l s
o