Generator Test (Undercharged Battery Check) - Suzuki 2006 SX4 Service Manual

Charging Indicator Lamp Operation
Condition
Charge light does not
light with ignition ON and
engine off
Charge light does not go
out with engine running
(battery requires frequent
recharging)

Generator Test (Undercharged Battery Check)

This condition, as evidenced by slow cranking or low
specific gravity can be caused by one or more of the
following conditions even though indicator lamp may be
operating normal. The following procedure also applies
to cars with voltmeter and ammeter.
• Make sure that undercharged condition has not been
caused by accessories left on for extended period of
time.
• Check drive belt for proper tension.
• If battery defect is suspected, refer to "Battery
Description".
• Inspect wiring for defects. Check all connections for
tightness and cleanliness, battery cable connections
at battery, starting motor and ignition ground cable.
No-Load Check
1) Connect voltmeter and ammeter as shown in figure.
NOTE
Use fully charged battery.
1. Generator
2. Ammeter (between generator "B" terminal and battery (+) terminal)
3. Voltmeter (between generator "B" terminal and ground)
4. Battery
5. Load
6. Switch
Possible cause
Fuse blown
Indicator lamp (LED) faulty
Wiring connection loose
IC regulator or field coil faulty
Poor contact between brush and slip
ring
Drive belt loose or worn
IC regulator or generator faulty
Wiring faulty
S6RW0D1A04003
I2RH011A0006-01
Correction / Reference Item
Check fuse.
Check BCM, combination meter and/or CAN
communication line.
Tighten loose connection.
Check generator.
Repair or replace.
Adjust or replace drive belt.
Check charging system.
Repair wiring.
2) Run engine from idling up to 2,000 rpm with all
accessories turned off and read meters.
If voltage is higher than standard value, check
ground of brushes.
If brushes are not grounded, replace IC regulator.
If voltage is lower than standard value, proceed to
the following check.
Specification for undercharged battery (No-load
check)
Current: 10 A
Voltage: 14.2 – 14.8 V at Hi (H) (at 25 °C, 77 °F)
Voltage: 12.5 – 13.1 V at Lo (L) (at 25 °C, 77 °F)
NOTE
Consideration should be taken that voltage
will differ somewhat with regulator case
temperature as shown in figure.
16.0
15.3
15.0
14.2
14.2
14.0
[A]
13.6
13.0
12.5
12.5
12.0
11.0
-30 0 25
[A]: Regulated voltage (V)
[B]: Heatsink temperature (°C)
Charging System:
14.8
14.8
H
13.3
13.1
13.1
L
11.6
135
[B]
I2RH0B1A0005-01
1J-5