Honda Accord 2008 Manual page 76

07/11/02 09:05:32 61TA0000_040_0030
Alternator Control Circuit Troubleshooting
1. Connect the Honda Diagnostic System (HDS) to the
data link connector (DLC) (see step 2 on page 11-3).
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle
and the engine control module (ECM)/powertrain
control module (PCM). If it doesn't communicate,
troubleshoot the DLC circuit (see page 11-208).
4. Check for DTCs (see page 11-3). If a DTC is present,
diagnose and repair the cause before continuing
with this test.
5. Disconnect the alternator 4P connector from the
alternator.
6. Start the engine, and turn on the headlights to high
beam.
7. Measure the voltage between alternator 4P
connector terminal No. 2 and the positive terminal
of the battery.
＊０１
ALTERNATOR
4P CONNECTOR
Is there 1 V or less?
YES
NO −
8. Jump the SCS line with the HDS, then turn the
ignition switch to LOCK (0).
NOTE: This step must be done to protect the ECM/
PCM from damage.
9. Disconnect ECM/PCM connector B (49P).
BATTERY
C (WHT/GRN)
Wire side of
female terminals
− Go to step 11.
Go to step 8.
10. Check for continuity between ECM/PCM connector
terminal B45 and body ground.
ECM/PCM CONNECTOR B (49P)
ALT C
(WHT/GRN)
Wire side of female terminals
Is there continuity?
YES − Repair short in the wire between the
alternator and the ECM/PCM.
NO − Update the ECM/PCM if it does not have the
latest software (see page 11-231), or substitute a
known-good ECM/PCM (see page 11-7), then
recheck. If the symptom/indication goes away with
a known-good ECM/PCM, replace the original ECM/
PCM (see page 11-232).
11. Jump the SCS line with the HDS, then turn the
ignition switch to LOCK (0).
NOTE: This step must be done to protect the ECM/
PCM from damage.
12. Disconnect ECM/PCM connector B (49P).
ＴＡ０８ＡＥ４Ａ１４１０００１２９０５ＦＡＡＴ００
＊０２
(cont'd)
4-29