Infiniti M35/M45 Y50. Manual - part 697

DTC P1554 BATTERY CURRENT SENSOR

EC-1261

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Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

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

SC-5, "SPECIFIC GRAVITY CHECK"

 .

Diagnostic Procedure

NBS005M5

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten ground screws on the body. 
Refer to 

EC-864, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

49

B/Y

Sensor power supply
(Battery current sensor)

[Ignition switch: ON]

Approximately 5V

67

B/W

Sensor ground
(Battery current sensor)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

71

L/R

Battery current sensor

[Engine is running]

●

Battery: Fully charged*

●

Idle speed

Approximately 2.6 - 3.5V

1.

Body ground M70

2.

Body ground M16

PBIB2782E

EC-1262

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DTC P1554 BATTERY CURRENT SENSOR

2. 

CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect battery current sensor (1) harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between battery current sensor terminal 1 and
ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E11, F2

●

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.

4. 

CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between battery current sensor terminal 2 and ECM terminal 67.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E73, F68

●

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.

PBIB2685E

Voltage: Approximately 5V

PBIA9891J

Continuity should exist.

DTC P1554 BATTERY CURRENT SENSOR

EC-1263

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6. 

CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between battery current sensor terminal 3 and ECM terminal 71.
Refer to Wiring Diagram.

2.

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

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E73, F68

●

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.

8. 

CHECK BATTERY CURRENT SENSOR

Refer to 

EC-1263, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace battery negative cable assembly.

9. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

NBS005M6

BATTERY CURRENT SENSOR

1.

Reconnect harness connectors disconnected.

2.

Disconnect battery negative cable (1).

●

: To body ground

3.

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

4.

Turn ignition switch ON.

Continuity should exist.

PBIB2724E

EC-1264

[VK45DE]

DTC P1554 BATTERY CURRENT SENSOR

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