Infiniti M35/M45 Y50. Manual - part 696

DTC P1553 BATTERY CURRENT SENSOR

EC-1257

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5.

Check voltage between ECM terminal 71 (battery current sensor
signal) and ground.

6.

If NG, replace battery negative cable assembly.

Voltage: Approximately 2.5V

PBIB2617E

EC-1258

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DTC P1554 BATTERY CURRENT SENSOR

DTC P1554 BATTERY CURRENT SENSOR

PFP:294G0

Component Description

NBS005M0

The power generation voltage variable control enables fuel con-
sumption to be decreased by reducing the engine load which is
caused by the power generation of the generator. The battery cur-
rent sensor (1) is installed to the battery cable at the negative termi-
nal. The sensor measures the charging/discharging current of the
battery. Based on the sensor signal, ECM judges whether or not the
power generation voltage variable control is performed. When per-
forming the power generation voltage variable control, ECM calcu-
lates the target power generation voltage based on the sensor
signal. And ECM sends the calculated value as the power genera-
tion command value to IPDM E/R. For the details of the power gen-
eration voltage variable control, refer to SC section.

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.

CONSULT-II Reference Value in Data Monitor Mode

NBS005M1

Specification data are reference values.

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

SC-5, "SPECIFIC GRAVITY CHECK"

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On Board Diagnosis Logic

NBS005M2

The MIL will not light up for this diagnosis.

NOTE:
If DTC P1554 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-1193, "DTC P0643 SENSOR POWER SUPPLY"

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PBIB2685E

MONITOR ITEM

CONDITION

SPECIFICATION

BAT CUR SEN

●

Engine speed: Idle

●

Battery: Fully charged*

●

Selector lever: P or N

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Air conditioner switch: OFF

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No load

Approx. 2,600 - 3,500mV

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1554
1554

Battery current sensor performance

The output voltage of the battery current 
sensor is lower than the specified value 
while the battery voltage is high enough.

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Harness or connectors
(The sensor circuit is open or shorted.)

●

Battery current sensor

DTC P1554 BATTERY CURRENT SENSOR

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Overall Function Check

NBS005M3

Use this procedure to check the overall function of the battery current sensor circuit. During this check, a 1st
trip DTC might not be confirmed.
TESTING CONDITION:

●

Before performing the following procedure, confirm that battery voltage is more than 12.8V at idle.

●

Before performing the following procedure, confirm that all load switches and A/C switch are
turned OFF.

 WITH CONSULT-II

1.

Start engine and let it idle.

2.

Select “BAT CUR SEN” in “DATA MONITOR” mode with CON-
SULT-II.

3.

Check “BAT CUR SEN” indication for 10 seconds.
“BAT CUR SEN” should be above 2,300mV at least once.

4.

If NG, go to 

EC-1261, "Diagnostic Procedure"

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 WITH GST

1.

Start engine and let it idle.

2.

Check voltage between ECM terminal 71 (battery current sensor
signal) and ground for 10 seconds.
The voltage should be above 2.3V at least once.

3.

If NG, go to 

EC-1261, "Diagnostic Procedure"

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PBIB2615E

PBIB2616E

EC-1260

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DTC P1554 BATTERY CURRENT SENSOR

Wiring Diagram

NBS005M4

TBWT1064E