Infiniti QX56 (JA60). Manual — part 186

CHG

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

CHG-7

< FUNCTION DIAGNOSIS >

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POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

System Diagram

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System Description

INFOID:0000000005146555

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.

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 Description

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ALMIA0057GB

Component part

Description

Battery current sensor

The battery current sensor is installed on the battery cable at the
negative terminal. The battery current sensor detects the charg-
ing/discharging current of the battery and sends a voltage signal
to the ECM according to the current value detected.

ECM

The battery current sensor detects the charging/discharging cur-
rent of the battery. The ECM judges the battery condition based on
this signal.
The ECM judges whether to request more output via the power
generation voltage variable control according to the battery condi-
tion.
When performing the power generation voltage variable control,
the ECM calculates the target power generation voltage according
to the battery condition and sends the calculated value as the pow-
er generation command value to the IPDM E/R.

IPDM E/R

The IPDM E/R converts the received power generation command
value into a pulse width modulated (PWM) command signal and
sends it to the IC regulator.

Generator (IC regulator)

The IC regulator controls the power generation voltage by the tar-
get power generation voltage based on the received PWM com-
mand signal.
When there is no PWM command signal, the generator performs
the normal power generation according to the characteristic of the
IC regulator.

CHG-8

< COMPONENT DIAGNOSIS >

CHARGING SYSTEM PRELIMINARY INSPECTION

COMPONENT DIAGNOSIS

CHARGING SYSTEM PRELIMINARY INSPECTION

Inspection Procedure

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1.

CHECK BATTERY TERMINALS CONNECTION

Check if battery terminals are clean and tight.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair battery terminals connection.

2.

CHECK FUSE

Check for blown fuse and fusible link.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Be sure to eliminate cause of malfunction before installing new fuse or fusible link.

3.

CHECK GENERATOR GROUND TERMINAL CONNECTION

Verify connector E206 terminal 5 (generator ground harness) is clean and tight.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair connection.

4.

CHECK DRIVE BELT TENSION

Check drive belt tension. Refer to

EM-13, "Checking Drive Belts"

.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair as needed.

Unit

Power source (Power supply terminals)

Fuse or Fusible Link

Generator

Battery (terminal 3)

Fuse 30

Battery (terminal 1)

Fusible Link A

Combination meter

Ignition switch ON (terminal 2)

Fuse 14

CHG

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM OPERATION

INSPECTION

CHG-9

< COMPONENT DIAGNOSIS >

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N

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM OPER-
ATION INSPECTION

Diagnosis Procedure

INFOID:0000000005146558

Regarding Wiring Diagram information, refer to

CHG-14, "Wiring Diagram"

.

CAUTION:

When performing this inspection, always use a charged battery that has completed the battery inspec-

tion. (When the charging rate of the battery is low, the response speed of the voltage change will

become slow. This can cause an incorrect inspection.)

1.

CHECK ECM (CONSULT-III)

Perform ECM self-diagnosis with CONSULT-III. Refer to

EC-63, "CONSULT-III Function (ENGINE)"

.

Self-diagnostic results content

No malfunction detected>> GO TO 2.

Malfunction detected>> Check applicable parts, and repair or replace corresponding parts.

2.

CHECK OPERATION OF POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

1. Connect CONSULT-III and start the engine.

2. The selector lever is in “P” or “N” position and all of the electric loads and A/C, etc. are turned OFF.

3. Select “ALTERNATOR DUTY” in “Active Test” of “ENGINE”, and then check the value of “BATTERY

VOLT” monitor when DUTY value of “ALTERNATOR DUTY” is set to 40.0 %.

4. Check the value of “BATTERY VOLT” monitor when DUTY value of “ALTERNATOR DUTY” is set to

80.0%.

Is the measurement value within specification?

YES

>> Inspection End.

NO

>> GO TO 3.

3.

CHECK IPDM E/R (CONSULT-III)

Perform IPDM E/R self-diagnosis with CONSULT-III. Refer to

PCS-14, "CONSULT - III Function (IPDM E/R)"

.

Self-diagnostic results content

No malfunction detected>> GO TO 4.

Malfunction detected>> Check applicable parts, and repair or replace corresponding parts.

4.

CHECK HARNESS BETWEEN GENERATOR AND IPDM E/R

“BATTERY VOLT”
2 seconds after setting the
DUTY value of “ALTERNA-
TOR DUTY” to 40.0 %

: 12 - 13.6 V

“BATTERY VOLT”
20 seconds after setting
the DUTY value of “ALTER-
NATOR DUTY” to 80.0 %

: +0.5 V or more against
the value of “BATTERY
VOLT” monitor when
DUTY value is 40.0 %

CHG-10

< COMPONENT DIAGNOSIS >

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM OPERATION

INSPECTION

1. Turn ignition switch OFF.

2. Disconnect generator connector E205 and IPDM E/R connector

E122.

3. Check continuity between generator harness connector E205

(A) terminal 4 and IPDM E/R harness connector E122 (B) termi-

nal 37.

4. Check continuity between generator harness connector E122

(A) terminal 4 and ground.

Are the continuity test results as specified?

YES

>> Replace IPDM E/R. Refer to

PCS-35, "Removal and Installation of IPDM E/R"

.

NO

>> Repair harness or connector between IPDM E/R and generator.

A

B

Continuity

Connector

Terminal

Connector

Terminal

E205

4

E122

37

Yes

A

—

Continuity

Connector

Terminal

E205

4

Ground

No

ALMIA0196ZZ