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Nissan Altima L32. Manual - part 443

P1554 BATTERY CURRENT SENSOR

EC-893

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

P1554 BATTERY CURRENT SENSOR

Description

INFOID:0000000004349867

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-5,

"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:0000000004349868

DTC DETECTION LOGIC

NOTE:

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

EC-867, "DTC Logic"

DTC CONFIRMATION PROCEDURE

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to

EC-893, "Component Function Check"

NOTE:

Use component function check to check the overall function of the battery current sensor circuit. During this

check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-894, "Diagnosis Procedure"

Component Function Check

INFOID:0000000004349869

PRECONDITIONING

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.

>> GO TO 2.

PERFORM COMPONENT FUNCTION CHECK

With CONSULT-III

1. Start engine and let it idle.

2. Select “BAT CUR SEN” in “DATA MONITOR” mode with CONSULT-III.

3. Check “BAT CUR SEN” indication for 10 seconds.

“BAT CUR SEN” should be above 2,300mV at least once.

Without CONSULT-III

1. Start engine and let it idle.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1554

Battery current sensor perfor-
mance

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

• Harness or connectors

(The sensor circuit is open or shorted.)

• Battery current sensor

EC-894

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

P1554 BATTERY CURRENT SENSOR

2. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-894, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000004349870

CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in

GI-45, "Circuit Inspection"

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair or replace ground connection.

CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT

1. Disconnect battery current sensor harness connector.

2. Turn ignition switch ON.

3. Check the voltage between battery current sensor harness con-

nector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

>> Repair open circuit or sort to ground or short to power in

harness or connectors.

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 4.

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

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.

ECM

Ground

Voltage

Connector

Terminal

F13

(Battery current sensor signal)

Ground Above 2.3V at least once

JMBIA1604ZZ

Battery current sensor

Ground

Voltage

Connector

Terminal

Ground

Approx. 5V

JMBIA1602ZZ

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F13

Existed

Battery current sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F13

Existed

P1554 BATTERY CURRENT SENSOR

EC-895

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

2. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 5.

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

CHECK BATTERY CURRENT SENSOR

Refer to

EC-895, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 6.

>> Replace battery negative cable assembly.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000004349871

CHECK BATTERY CURRENT SENSOR

1. Reconnect harness connectors disconnected.

2. Disconnect battery negative cable (1).

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

body ground.

4. Turn ignition switch ON.

5. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> INSPECTION END

>> Replace battery negative cable assembly.

: To body ground

ALBIA0076ZZ

ECM

Ground

Voltage

Connector

Terminal

F13

(Battery current sensor signal)

Ground Approx. 2.5V

JMBIA1603ZZ

EC-896

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

P1564 ASCD STEERING SWITCH

P1564 ASCD STEERING SWITCH

Description

INFOID:0000000004349872

ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation

of switch, and determines which button is operated.

Refer to

EC-603, "System Description"

for the ASCD function.

DTC Logic

INFOID:0000000004349873

DTC DETECTION LOGIC

NOTE:

If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to

EC-864, "DTC Logic"

DTC CONFIRMATION PROCEDURE

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.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Wait at least 10 seconds.

3. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.

4. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.

5. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-

onds.

6. Press SET/COAST switch for at least 10 seconds, then release it and wait at least 10 seconds.

7. Check DTC.
Is DTC detected?

YES

>> Go to

EC-896, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349874

CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in

GI-45, "Circuit Inspection"

Is the inspection result normal?

>> GO TO 2.

>> Repair or replace ground connection.

CHECK ASCD STEERING SWITCH CIRCUIT

With CONSULT-III

1. Turn ignition switch ON.

DTC No.

Trouble diagnosis

name

DTC detecting condition

Possible cause

P1564

ASCD steering switch

• An excessively high voltage signal from the

ASCD steering switch is sent to ECM.

• ECM detects that input signal from the

ASCD steering switch is out of the specified
range.

• ECM detects that the ASCD steering switch

is stuck ON.

• Harness or connectors

(The switch circuit is open or shorted.)

• ASCD steering switch
• ECM

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