Infiniti Q45. Manual - part 794

CHARGING SYSTEM

SC-21

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PRELIMINARY INSPECTION

1. 

CHECK BATTERY TERMINALS CONNECTION

Check if battery terminals is clean and tight.

OK or NG

OK

>> GO TO 2.

NG

>> Repair battery terminals connection.

2. 

CHECK FUSE AND FUSIBLE LINK

Check for blown fuse and fusible link.

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 “E” TERMINAL CONNECTION

Check if “E” terminal is clean and tight.

OK or NG

OK

>> GO TO 4.

NG

>> Repair “E” terminal connection.

4. 

CHECK ALTERNATOR DRIVE BELT TENSION

Check alternator drive belt tension. Refer to 

EM-14, "Checking Drive Belts"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Repair as needed.

Unit

Power source (Power supply terminals)

Fuse and fusible link No.

Alternator

Battery (“S” terminal)

56

Combination meter

Ignition switch ON (“L” terminal)

9

SC-22

CHARGING SYSTEM

DIAGNOSTIC PROCEDURE 1
Check “L” Terminal Circuit (Open)

1. 

CHECK “L” TERMINAL CONNECTION

1.

Turn ignition switch OFF.

2.

Check if “L” terminal is clean and tight.

OK or NG

OK

>> GO TO 2.

NG

>> Repair “L” terminal connection. Confirm repair by performing complete Battery/Starting/Charging

system test.

2. 

CHECK “L” TERMINAL CIRCUIT (OPEN)

1.

Disconnect alternator connector.

2.

Apply ground to alternator harness connector E310 terminal 3
(G) with the ignition switch in the ON position.

OK or NG

OK

>> Go to 

SC-20, "WORK FLOW"

 .

NG

>> Check the following.

●

Harness for open between combination meter and
alternator

●

Harness for open between combination meter and
fuse

●

Charge warning lamp (Combination meter)

DIAGNOSTIC PROCEDURE 2
Check “L” Terminal Circuit (Short)

1. 

CHECK “L” TERMINAL CIRCUIT (SHORT)

1.

Turn ignition switch OFF.

2.

Disconnect alternator connector.

3.

Turn ignition switch ON.

CHARGE lamp should light up?

YES

>> Check the following.

●

Harness for short between combination meter and alternator

●

Charge warning lamp (Combination meter)

NO

>> Go to 

SC-20, "WORK FLOW"

 .

3 (G) – Ground

: CHARGE lamp should light up.

SKIB0656E

CHARGING SYSTEM

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DIAGNOSTIC PROCEDURE 3
Check “S” Terminal Circuit

1. 

CHECK “S” TERMINAL CONNECTION

1.

Turn ignition switch OFF.

2.

Check if “S” terminal is clean and tight.

OK or NG

OK

>> GO TO 2.

NG

>> Repair “S” terminal connection. Confirm repair by performing complete Battery/Starting/Charging

system test.

2. 

CHECK “S” TERMINAL CIRCUIT

Check voltage between alternator harness connector E310 terminal
4 (P) and ground.

OK or NG

OK

>> Go to 

SC-20, "WORK FLOW"

 .

NG

>> Check harness for open between alternator and fuse.

4 (P) – Ground

: Battery voltage

SKIB0657E

SC-24

CHARGING SYSTEM

DIAGNOSTIC PROCEDURE 4
Check “B” Terminal Circuit

1. 

CHECK “B” TERMINAL CONNECTION

1.

Turn ignition switch OFF.

2.

Check if “B” terminal is clean and tight.

OK or NG

OK

>> GO TO 2.

NG

>> Repair “B” terminal connection. Confirm repair by performing complete Battery/Starting/Charging

system test.

2. 

CHECK “B” TERMINAL CIRCUIT

Check voltage between alternator “B” terminal E309 terminal 1 (B/R)
and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Check harness for open between alternator and fusible

link.

3. 

CHECK “B” TERMINAL CONNECTION (VOLTAGE DROP TEST)

1.

Start engine.

2.

When engine running at idle and warm, check voltage between
alternator “B” terminal E309 terminal 1 (B/R) and battery positive
terminal.

OK or NG

OK

>> Go to 

SC-20, "WORK FLOW"

 .

NG

>> Check harness between battery and alternator for poor

continuity.

1 (B/R) – Ground

: Battery voltage

PKIA2944E

1 (B/R) – Battery positive terminal

: Less than 0.2 V

PKIA2366E