1J-4 Charging System:
Generator Symptom Diagnosis
S5JB0A1A04001
A charging circuit wiring diagram for generator connection is shown in “Generator Description: ”. To avoid damage,
always follow these precautions:
CAUTION
!
• Do not mistake polarities of “IG” terminal and “L” terminal.
• Do not create a short circuit between “IG” and “L” terminals. Always connect these terminals
through a lamp.
• Do not connect any load between “L” and “E” terminals.
• When connecting charger or booster battery to vehicle battery, refer to “Jump Starting in Case of
Emergency: ”.
Trouble in charging system will show up as one or more of the following conditions:
1) Faulty charge indicator light operation.
2) An undercharged battery as evidenced by slow cranking or indicator clear with dark on light yellow dot.
3) An overcharged battery as evidenced by excessive spewing of electrolyte from vents.
Generator Test (Undercharged Battery Check)
S5JB0A1A04002
This condition, as evidenced by slow cranking or
indicator clear with dark or light yellow dot 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.
1) Make sure that undercharged condition has not been
caused by accessories left on for extended period of
time.
2) Check drive belt for proper tension.
3) If battery defect is suspected, refer to “Battery
Description: ”.
4) Inspect wiring for defects. Check all connections for
tightness and cleanliness, battery cable connections
at battery, starting motor, ignition ground cable and
no “C” terminal circuit at ground.
5) Connect switch (6), load (5), battery (4), voltmeter
(3) and ammeter (2) to generator (1) as shown in
figure.
Voltmeter:
Set between generator “B” terminal and
ground.
Ammeter:
Set between generator “B” terminal and
battery (+) terminal.
NOTE
Use fully charged battery.
6) Measure current and voltage.
Condition
Possible cause
Correction / Reference Item
Noisy generator
Loose drive belt
Adjust or replace drive belt.
Loose drive belt pulley
Check generator.
Loose mounting bolts
Check mounting condition.
Worn or dirty bearings
Check generator.
Defective diode or stator
Check generator.
Charge indicator light
does not light with
ignition ON and engine off
Fuse blown
Check fuse.
Indicator lamp (LED) faulty
Check BCM, combination meter and/or CAN
communication line.
Wiring connection loose
Tighten loose connection.
IC regulator faulty
Check generator.
Poor contact between brush and slip
ring
Repair or replace.
Charge indicator light
does not go out with
engine running
Battery requires frequent
recharging
Drive belt loose or worn
Adjust or replace drive belt.
IC regulator or generator faulty
Check charging system.
Wiring faulty
Repair wiring.
IYSQ011A0007-01
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