Infiniti G35 (V35) Sedan. Manual - part 558

 

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Infiniti G35 (V35) Sedan. Manual - part 558

 

 

EC-378

< COMPONENT DIAGNOSIS >

[VQ35HR]

P1550 BATTERY CURRENT SENSOR

P1550 BATTERY CURRENT SENSOR

Description

INFOID:0000000000956777

The power generation voltage variable control enables fuel consumption to be decreased by reducing the
engine load which is caused by the power generation of the generator. The battery current sensor is installed
to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the bat-
tery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is
performed. When performing the power generation voltage variable control, ECM calculates the target power
generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation
command value to IPDM E/R. For the details of the power generation voltage variable control, refer to 

CHG-8,

"System Description"

.

CAUTION:

Do not connect the electrical component or the ground wire directly to the battery terminal. The con-
nection causes the malfunction of the power generation voltage variable control, and then the battery
discharge may occur.

DTC Logic

INFOID:0000000000956778

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and wait at least 10 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-379, "Diagnosis Procedure"

.

NO

>> INSPECTION END

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1550

Battery current sensor circuit 
range/performance

The output voltage of the battery current 
sensor remains within the specified 
range while engine is running.

• Harness or connectors

(Battery current sensor circuit is open 
or shorted.)
[CKP sensor (POS) circuit is shorted.]
[CMP sensor (PHASE) (bank 2) circuit 
is shorted.]
[EVT control position sensor (bank 2) 
circuit is shorted.]
(APP sensor 2 circuit is shorted.)
(EVAP control system pressure sensor 
circuit is shorted.)
(Refrigerant pressure sensor circuit is 
shorted.)

• Battery current sensor
• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE) 

(bank 2)

• Exhaust valve timing control position 

sensor (bank 2)

• Accelerator pedal position sensor
• EVAP control system pressure sensor
• Refrigerant pressure sensor

P1550 BATTERY CURRENT SENSOR

EC-379

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Diagnosis Procedure

INFOID:0000000000956779

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-42, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-I

1.

Disconnect battery current sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between battery current sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 3.

3.

CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between battery current sensor harness connector and ECM harness connector.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F1, E3
• Harness for open between battery current sensor and ECM

>> Repair open circuit.

5.

CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT-III

Check harness for short to power and short to ground, between the following terminals.

Battery current sensor

Ground

Voltage

Connector

Terminal

E21

1

Ground

Approx. 5V

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E21

1

F102

64

Existed

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F101

46

CKP sensor (POS)

F2

1

F102

64

CMP sensor (PHASE) (bank 2)

F18

1

EVT control position sensor (bank 2)

F19

1

Battery current sensor

E21

1

M107

103

APP sensor

E112

6

107

EVAP control system pressure sensor

B252

3

111

Refrigerant pressure sensor

E77

3

EC-380

< COMPONENT DIAGNOSIS >

[VQ35HR]

P1550 BATTERY CURRENT SENSOR

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair short to ground or short to power in harness or connectors.

6.

CHECK COMPONENTS

Check the following.
• Crankshaft position sensor (POS) (Refer to 

EC-257, "Component Inspection"

.)

• Camshaft position sensor (PHASE) (bank 2) (Refer to 

EC-262, "Component Inspection"

.)

• Exhaust valve timing control position sensor (bank 2) (Refer to 

EC-350, "Component Inspection"

.)

• EVAP control system pressure sensor (Refer to 

EC-298, "Component Inspection"

.)

• Refrigerant pressure sensor (Refer to 

HAC-92, "Component Inspection"

.)

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace malfunctioning component.

7.

CHECK APP SENSOR

Refer to 

EC-427, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> GO TO 8.

8.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1.

Replace accelerator pedal assembly.

2.

Go to 

EC-427, "Special Repair Requirement"

.

>> INSPECTION END

9.

CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between battery current sensor harness connector and ECM harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F1, E3
• Harness for open or short between battery current sensor and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

11.

CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between battery current sensor harness connector and ECM harness connector.

2.

Also check harness for short to ground and short to power.

Is the inspection result normal?

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E21

2

F102

95

Existed

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E21

3

F102

91

Existed

P1550 BATTERY CURRENT SENSOR

EC-381

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

YES

>> GO TO 13.

NO

>> GO TO 12.

12.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F1, E3
• Harness for open or short between battery current sensor and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

13.

CHECK BATTERY CURRENT SENSOR

Refer to 

EC-381, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Replace battery negative cable assembly.

14.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000000956780

1.

CHECK BATTERY CURRENT SENSOR

1.

Turn ignition switch OFF.

2.

Reconnect harness connectors disconnected.

3.

Disconnect battery negative cable (1).

4.

Install jumper cable (A) between battery negative terminal and
body ground.

5.

Turn ignition switch ON.

6.

Check the voltage between ECM harness connector and
ground.

Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to 

PG-2, "How to Handle Battery"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace battery negative cable assembly.

: To body ground

ECM

Ground

Voltage

Connector

Terminal

F102

91

(Battery current sensor signal)

Ground

Approx. 2.5V

JMBIA0027ZZ

 

 

 

 

 

 

 

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