Nissan Pathfinder (2005 year). Instruction — part 399
CHARGING SYSTEM
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2005 Pathfinder
CHARGING SYSTEM
PFP:23100
System Description
EKS009J2
The generator provides DC voltage to operate the vehicle's electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Power is supplied at all times to generator terminal 3 through:
●
15A fuse (No. 30, located in the fuse and fusible link box).
Terminal 1 supplies power to charge the battery and operate the vehicle's electrical system. Output voltage is
controlled by the IC regulator at terminal 3 detecting the input voltage. A pulse width modulated (PWM) signal
is sent from terminal 37 of the IPDM E/R to terminal 4 of the generator. The ECM determines the duty cycle of
the power generation variable voltage control system. The charging circuit is protected by the 140A fusible link
[letter a , located in the fusible link box (battery)].
The generator is grounded through the engine.
With the ignition switch in the ON or START position, power is supplied:
●
through 10A fuse [No. 14, located in the fuse block (J/B)]
●
to combination meter terminal 16 for the charge warning lamp.
Ground is supplied to terminal 2 of the combination meter through terminal 2 of the generator. With power and
ground supplied, the charge warning lamp will illuminate. When the generator is providing sufficient voltage
with the engine running, the ground is opened and the charge warning lamp will go off. If the charge warning
lamp illuminates with the engine running, a fault is indicated. The IC regulator warning function activates to
illuminate “CHARGE” warning lamp, if any of the following symptoms occur while generator is operating:
●
Excessive voltage is produced.
●
No voltage is produced.
POWER GENERATION VARIABLE VOLTAGE CONTROL SYSTEM
Power generation variable voltage control system has been adopted. By varying the voltage to the generator,
engine load due to power generation of the generator is reduced and fuel consumption is decreased.
Operation
●
The battery current sensor detects the charging/discharging current of the battery. ECM judges the battery
condition based on this signal.
●
ECM judges whether to control voltage according to the battery condition.
●
ECM calculates the target power generation voltage according to the battery condition and sends the cal-
culated value, through CAN lines, as the power generation command value to IPDM E/R.
●
IPDM E/R converts the received power generation command value into the power generation command
signal (PWM signal) and sends it to the IC regulator.
●
The IC regulator performs final control over the power generation voltage.
PKIB4908E
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CHARGING SYSTEM
2005 Pathfinder
●
When there is no power generation command signal, the generator performs the normal power generation
according to the characteristic of the IC regulator.
NOTE:
When any malfunction is detected in the power generation variable voltage control system, power generation
is performed according to the characteristic of the IC regulator in the generator.
Component
BATTERY CURRENT SENSOR
●
Battery current sensor is installed to the negative battery cable
and it detects the charging/discharging current of the battery and
sends the voltage signal to ECM according to the current value.
PKIB4502E
CHARGING SYSTEM
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2005 Pathfinder
Wiring Diagram — CHARGE —
EKS009J3
WKWA1962E
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CHARGING SYSTEM
2005 Pathfinder
Trouble Diagnoses with Battery/Starting/Charging System Tester
EKS009J4
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and generator test segments must be done
as a set from start to finish.
Before starting, perform the preliminary inspection. Refer to
SC-25, "PRELIMINARY INSPECTION"
.
1.
Stop the operation of the power generation variable voltage control system using either of the following
procedures.
●
Using the CONSULT-II set the "ALT DUTY" to 0%. Keep "ALT DUTY" at 0% until the end of the inspec-
tion. When the "ALT DUTY" value is 0% or 100%, normal power generation is performed according to
the characteristic of the IC regulator in the generator.
●
Turn the ignition switch off, and disconnect the battery current sensor connector. Disconnecting the bat-
tery current sensor may cause DTC (P1550 - P1554) to set. After finishing the inspection, connect the
battery current sensor connector and erase the self-diagnostic results history of the engine using CON-
SULT-II.
2.
Turn off all loads on the vehicle electrical system.
3.
Perform battery and starting system test with Battery/Starting/
Charging system tester.
4.
Press “ENTER” to begin the charging system test.
5.
Start engine.
6.
Press “ENTER” until “LOADS OFF REV ENGINE 5 SEC” is dis-
played.
7.
Raise and hold the engine speed at 1,500 to 2,000 rpm for about
5 seconds, then return the engine to idle.
Once the increase in engine rpm is detected, press “ENTER” to
continue.
NOTE:
●
If after 30 seconds an increase in engine idle speed is not
detected, “RPM NOT DETECTED” will display.
●
Some engines may have a higher idle initially after starting,
particularly when the engine is cold. The tester may detect
this without any other action being taken. If this occurs, con-
tinue on with the testing process. The final results will not be affected.
8.
The tester now checks the engine at idle and performs the
DIODE/RIPPLE check.
9.
When complete, the tester will prompt you to turn on the follow-
ing electrical loads.
●
Heater fan set to highest speed. Do not run the A/C or wind-
shield defroster.
●
Head lamp high beam
●
Rear window defogger
NOTE:
Do not run the windshield wipers or any other cyclical loads.
SEL417X
SEL418X
SEL419X
CHARGING SYSTEM
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2005 Pathfinder
10. Press “ENTER” to continue.
11. Raise and hold the engine speed at 1,500 to 2,000 rpm for about
5 seconds, then return the engine to idle. Once the increase in
engine rpm is detected, press “ENTER” to continue.
NOTE:
If after 30 seconds an increase in engine idle speed is not
detected, “RPM NOT DETECTED” will be displayed. Press
“ENTER” to restart the test.
12. Diagnostic result is displayed on the tester. Refer to
"DIAGNOSTIC RESULT ITEM CHART"
.
13. Press “ENTER” then test output code is displayed. Record the
test output code on the repair order.
14. Toggle back to the “DIAGNOSTIC SCREEN” for test results.
DIAGNOSTIC RESULT ITEM CHART
SEL420X
SEL421X
SEL422X
SEL577X
Diagnostic item
Service procedure
CHARGING SYSTEM NORMAL
Charging system is normal and will also show DIODE RIPPLE test result.
NO CHARGING VOLTAGE
Go to
.
LOW CHARGING VOLTAGE
HIGH CHARGING VOLTAGE
DIODE RIPPLE NORMAL
Diode ripple is OK and will also show CHARGING VOLTAGE test result.
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CHARGING SYSTEM
2005 Pathfinder
WORK FLOW
EXCESS RIPPLE DETECTED
Replace the generator. Refer to
SC-30, "Removal and Installation"
. Perform “DIODE RIP-
PLE” test again using Battery/Starting/Charging system tester to confirm repair.
DIODE RIPPLE NOT DETECTED
Go to
.
Diagnostic item
Service procedure
WKIA3383E
CHARGING SYSTEM
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2005 Pathfinder
PRELIMINARY INSPECTION
1.
CHECK BATTERY TERMINALS CONNECTION
Check if battery terminals are clean and tight.
OK or NG
OK
>> GO TO 2.
NG
>> Repair battery terminal connections.
2.
CHECK FUSE AND FUSIBLE LINK
Check for blown fuses and fusible link. Refer to
PG-80, "FUSE AND FUSIBLE LINK BOX"
.
OK or NG
OK
>> GO TO 3.
NG
>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.
3.
CHECK GENERATOR DRIVE BELT TENSION
Check generator drive belt tension. Refer to
.
OK or NG
OK
>> Inspection End.
NG
>> Repair as needed.
DIAGNOSTIC PROCEDURE 1
Check Terminal "2" Circuit (Open)
1.
CHECK “2” TERMINAL CONNECTION
1.
Turn the ignition switch OFF.
2.
Check “2” terminal harness connector.
OK or NG
OK
>> GO TO 2.
NG
>> Repair “2” terminal connection. Confirm repair by performing complete Battery/Starting/Charging
system test. Refer to
SC-22, "Trouble Diagnoses with Battery/Starting/Charging System Tester"
.
*1
SC-25, "DIAGNOSTIC PROCE-
DURE 1"
*2
SC-28, "DIAGNOSTIC PROCE-
DURE 4"
*3
SC-26, "DIAGNOSTIC PROCE-
DURE 2"
*4
SC-28, "DIAGNOSTIC PROCE-
DURE 4"
*5
SC-31, "GENERATOR PULLEY
INSPECTION"
Unit
Power source (Power supply terminals)
Fuse or fusible link
Generator
Battery (“1” terminal)
a
Battery (“3” terminal)
30
Combination meter
Ignition switch ON (“2” terminal)
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2005 Pathfinder
2.
CHECK “2” TERMINAL CIRCUIT (OPEN)
1.
Disconnect E205 connector from generator.
2.
Apply ground to connector E205 terminal 2 with the ignition
switch in the ON position.
OK or NG
OK
>> GO TO
.
NG
>> Check the following.
●
Charge warning lamp (Combination meter)
●
Harness for open or short between combination
meter and fuse
●
Harness for open between combination meter and
generator
DIAGNOSTIC PROCEDURE 2
Check Terminal "2" Circuit (Short)
1.
CHECK “2” TERMINAL CIRCUIT (SHORT)
1.
Turn the ignition switch OFF.
2.
Disconnect generator connector E205.
3.
Turn ignition switch ON.
Does charge warning lamp light up?
YES
>> Check the following.
●
Harness for short between combination meter and generator
●
Charge warning lamp (Combination meter)
NO
>> GO TO
.
CHARGE lamp should light up.
WKIA3184E
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