Hyundai Elantra: Repair procedures - Charging System - Engine Electrical System - Hyundai Elantra HD 2006Ц2010 Service ManualHyundai Elantra: Repair procedures


Inspection

Voltage Drop Test
This test determines if the wiring between the alternator"B" terminal and the battery (+) terminal is good by thevoltage drop method.
Preparation
1.
Turn the ignition switch to "OFF."
To identify connection problems, be sure not to disturbeither of the two terminals or their connections duringthis test.
2.
Connect a digital voltmeter between the alternator "B"terminal and battery (+) terminal. Connect the (+)lead wire of the voltmeter to the"B" terminal and the(-) lead wire to the battery (+) terminal.
Conditions For Testing
With the engine running and headlamps, blower motor etc.ON, check the reading on the voltmeter.
Result
1.
The voltmeter should read a standard 0.2V.
2.
If the reading is above 0.2V, poor wiring should be suspected.
Check wiring from alternator 'B' terminal through the fusible link to the battery (+) terminal.
Check for loose wiring or color change from an overheated harness. Correct and check again.
3.
On completion of the test, set the engine at idle.
Then turn off the headlamps, blower motor etc., and ignition.

Output Current Test
This test determines if the alternator gives an output currentthat is equivalent to the nominal output.
Preparation
1.
Prior to the test, check the following items and correct as necessary.
(1)
Check if that the battery installed in the vehicle is in good condition. For details, see "BATTERY".
The battery that is used to test the output current should be one that has been partially discharged. With a fully charged battery, the test may not be conducted correctly due to an insufficient load.
(2)
Check the tension of the alternator drive belt. See "COOLING".
2.
Turn the ignition switch to "OFF".
3.
Disconnect the battery ground cable.
4.
Disconnect the alternator output wire from the alternator "B" terminal.
5.
Connect a DC ammeter (0 to 100A) in series between the "B" terminal and the disconnected output wire. Be sure to connect the (-) lead wire ofthe ammeter to the disconnected output wire.
Tighten each connection securely, as a heavy current will flow. Do not rely on clips.
6.
Connect a voltmeter (0 to 20V) between the "B" terminal and ground. Connect the (+) lead wire to the alternator "B" terminal and (-) lead wireto a good ground.
7.
Attach an engine tachometer and connect the battery ground cable.
8.
Leave the engine hood open.

Test
1.
Check to see that the voltmeter reads the same value as the battery voltage. If the voltmeter reads 0V, an open circuit in the wire between the alternator "B" terminal and battery (+) terminal, a blown fusible link or poorground is suspected.
2.
Start the engine and turn the headlights on.
3.
Set the headlights to high beam and the heater blower switch to HIGH, quickly increase the engine speed to 2,500 rpm and read the maximumoutput current value indicated by the ammeter.
After the engine starts, the charging current quickly drops. Therefore, the above operation must be done quickly to readthe maximum current value correctly.
Result
1.
The ammeter reading must be higher than the limit value. If it is lower but the alternator output wire is in good condition, remove the alternator from the vehicle and test it.

Limit value : 45A

1.
The nominal output current value is shown on the nameplate affixed to the alternator body.
2.
The output current value changes with the electrical load and the temperature of the alternator itself. Therefore, the nominal output current may not be obtained. In such case, keep the headlights on to discharge the battery, or use the lights of another vehicle to increase the electrical load.
The nominal output current may not be obtained if the temperature of the alternator itself or ambient temperature is too high.
In such a case, reduce the temperature before testing again.
2.
Upon completion of the output current test, lower the engine speed to idle and turn off the ignition switch.
3.
Disconnect the battery ground cable.
4.
Remove the ammeter and voltmeter and the engine tachometer.
5.
Connect the alternator output wire to the alternator "B" terminal.
6.
Connect the battery ground cable.
Regulated Voltage Test
The purpose of this test is to check that the electronic voltageregulator controls the voltage correctly.
Preparation
1.
Prior to the test, check the following items and correct if necessary.
(1)
Check that the battery installed in the vehicle is fully charged. For battery checking method, see the "BATTERY" section.
(2)
Check the alternator drive belt tension. For belt tension check, see section, "COOLING."
2.
Turn ignition switch to "OFF."
3.
Disconnect the battery ground cable.
4.
Connect a digital voltmeter between the "S(L)" terminal of the alternator and ground.
Connect the (+) lead of the voltmeter to the "S(L)" terminal of the alternator. Connect the (-) lead to a good ground or the battery (-) terminal.
5.
Disconnect the alternator output wire from the alternator "B" terminal.
6.
Connect a DC ammeter (0 to 100A) in series between the "B" terminal and the disconnected output wire. Connect the (-) lead wire of the ammeterto the disconnected output wire.
7.
Attach the engine tachometer and connect the battery ground cable.

Test
1.
Turn on the ignition switch and check to see that the voltmeter indicates the following value.
Voltage : Battery voltage
If it reads 0V, there is an open circuit in the wire between the alternator "S(L)" terminal and the battery and the battery (+), or the fusible link isblown.
2.
Start the engine. Keep all lights and accessories off.
3.
Run the engine at a speed of about 2,500 rpm and read the voltmeter when the alternator output current drops to 10A or less.
Result
1.
If the voltmeter reading agrees with the value, the voltage regulator is functioning correctly. If the reading is other than the standard value, the voltage regulator or the alternator is faulty.
2.
Upon completion of the test, reduce the engine speed to idle, and turn off the ignition switch.
3.
Disconnect the battery ground cable.
4.
Remove the voltmeter, ammeter, and the engine tachometer.
5.
Connect the alternator output wire to the alternator "B" terminal.
6.
Reconnect the battery ground cable.

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