Alternator Control System Test - Honda Civic 2002-2003 Service Manual

Charging System
Charging Circuit Troubleshooting (cont'd)
6. Start the engine. Hold the engine at 3,000 rpm with
no load (in Neutrall until the radiator fan comes on,
then let it idle.
7. Raise the engine speed to 2,000 rpm, and hold it
there.
8.
Turn the headlights Ihigh beaml on, and measure
voltage at the under-hood fuse/relay box terminal.
Is the voltage between 13.9 and 15.1 V?
VES~Go
to step 9.
NO~Repair or replace the alternator components
Isee page 4-30) .•
9. Read the amperage at 13.5 V.
NOTE: Adjust the voltage by turning the blower
motor, rear window defogger, brake lights, etc. ON.
Is the amperage 60A or more?
VES~Alternator/regulator operation is OK .•
NO~Repair or replace the alternator components
Isee page 4-30),.
4-24
Alternator Control System Test
NOTE: After troubleshooting, perform the engine
control module IECM) idle learn procedure Isee page
11-139).
1. Check for proper operation of the electrical load
detector IELD) by checking the malfunction
indicator lamp IMIL) Isee page 11-3). If a DTC is
present, diagnose and repair the cause before
continuing with this test.
2. Disconnect the engine wire harness 6P connector
from the starter sub harness 6P connector.
3. Start the engine, and turn the headlights Ihigh
beam) ON.
4. Measure voltage between the engine wire harness
6P
connector
terminal No.2 and the positive
terminal of the battery.
BATTERY
C IWHT/GRN)
2 3
5 6
ENGINE WIRE HARNESS 6P CONNECTOR
Wire side of female terminals
Is there 1 V or less?
VES~Go
to step 8.
NO~Go
to step 5.
5. Turn the headlights and ignition switch OFF.
6. Disconnect ECM connector B 124P).
-.
,
•