Honda 2004 Odyssey Service Manual page 111

Charging System
Charging Circuit Troubleshooting (cont'd)
Alternator Control System Test
1. Check for proper operation of the electrical load
detector (ELD) by checking the malfunction
indicator lamp (MIL) (see page 11-3). If a DTC is
present, diagnose and repair the cause before
continuing with this test.
2. Disconnect the alternator 4P connector from the
alternator.
3. Start the engine, and turn the headlights (high
beam) ON.
4. Measure voltage between the alternator 4P
connector terminal No. 2 and the positive terminal
of the battery.
BATTERY
ALTERNATOR
4P CONNECTOR
Is there 1 V or less?
YES Go to step 8.
NO Go to step 5.
5. Turn the headlight and ignition switch OFF.
6. Disconnect the powertrain control module (PCM)
connector C (31P) (1999-2000, 2002-2004 models)
or PCM connector B (24P) (2001 model).
4-24
C (WHT/GRN)
Wire side of
female terminals
7. Check for continuity between the PCM connector
terminal C2 (1999-2000, 2002-2004 models) or B6
(2001 model) and body ground.
1999-2000 models:
PCM CONNECTOR C (31P)
ALTC
(WHT/GRN)
Wire side of female terminals
2001 model:
PCM CONNECTOR B (24P)
ALTC (WHT/GRN)
Wire side of female terminals
2002-2004 models:
PCM CONNECTOR C (31P)
ALTC
(WHT/GRN)
Wire side of female terminals
Is there continuity?
YES Repair a short in the wire between the
alternator and PCM.
NO Substitute a known-good PCM, and recheck
(see page 11-5). If prescribed voltage is now
available, replace the original PCM
(see page 11-4).