Infiniti M35/M45 Y50. Manual - part 516

DTC P1551, P1552 BATTERY CURRENT SENSOR

EC-537

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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-538

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DTC P1553 BATTERY CURRENT SENSOR

DTC P1553 BATTERY CURRENT SENSOR

PFP:294G0

Component Description

NBS00545

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

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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

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The MIL will not light up for this diagnosis.

NOTE:
If DTC P1553 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-486, "DTC P0643 SENSOR POWER SUPPLY"

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PBIB2685E

MONITOR ITEM

CONDITION

SPECIFICATION

BAT CUR SEN

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Engine speed: Idle

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Battery: Fully charged*

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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

P1553
1553

Battery current sensor perfor-
mance

The signal voltage transmitted from the 
sensor to ECM is higher than the amount 
of the maximum power generation.

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

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Battery current sensor

DTC P1553 BATTERY CURRENT SENSOR

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DTC Confirmation Procedure

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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.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and wait at least 10 seconds.

4.

If 1st trip DTC is detected, go to 

EC-541, "Diagnostic Procedure"

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 WITH GST

Follow the procedure “WITH CONSULT-II” above.

SEF058Y

EC-540

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DTC P1553 BATTERY CURRENT SENSOR

Wiring Diagram

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TBWT0995E