Honda CR-V 1997 Service Manual page 77

'98 - '99 models: Altemator Control System Test IU.S.A. model!
r:-:'I
~
NOTE: Before testing, check proper operation of the ELD by checking for a DTC (see section 111.
BATTERY
Ch.~k
for
II
short in the circuit
(ALTeline):
+
1. Disconnect the 4P connector CAUTION: B. sur. to use
II
voltmeter
from the alternator. with its positive terminel connected to
V
2.
Start the engine, and turn the battery positive and its negative termi-
C
headlights (high beam) ON .
nal to the 4P connector terminal No. 2.
IWHT/GRN}
3.
Measure voltage between the
~
4P connector terminal No.2
ALTERNATOR
and the positive terminal of
Wire side of
the battery.
female terminals
l
3 4
4PCONNECT
'--'--
OR
ALTC
C
"-
YES
IWHT/GRN}
IWHT/GRN}
Is there 1 V or less?
/'
n
NO
.--
.
,
•
..
,
• • 10
V"
-~
Check for an open In the wire
IIn'llI.20n
,
.
IALTC line):
"
RDR
""
ALTERNATOR
1.
Turn the headlight and igni-
4PCONNECTO
tion switch OFF.
ECM/PCM CONNECTOR
R
2. Disconnect the 31P connector
C 131P}
from the ECM/PCM .
3.
Check for continuity between Wire side of
the ECM/PCM 31 P connector fema le terminals
term inal No. 2 and alternator
4P con necto r terminal No . 2.
Is there continuity?
"-
NO
I
Repair open in the wlr. between
. / I
the alternltor and ECM/PCM.
YES
Test Ind repair the alternator
components.
ALTC
ECM/PCM CONNECTOR C I 31P}
IWHT/GRN}
I
Check for I short in the w lr.
IALTCline}:
,
.
Turn the headlight and ig ni-
tio n switch OFF.
1
zV
4 5
•
7
8 9 10
2.
Disconnect the 31P connector
1/ V 1/
from the ECM/PCM.
12
/
18 17 18
19 20 21
3.
Check for continuity between
/
V
the ECM/PCM 31P connector
25 26
27 Z8
29
30
terminal No . 2 and body
n
ground . Wire side of
-
female terminals
Substitute a known-good ECMI
"-
NO
PCM, and recheck .
Is there continuity?
/ '
If prescribed voltage is now IvaM-
able. replace the original ECMI
YES PCM .
Repair short In the wire between
1M Itt.rnltor and the ECM/PCM,
cont' d}
4-27