2007 INFINITI QX56 Factory Service Manual

fuel pump wheel torque fuel tank capacity wiper blades trailer warning lights

Page 1577 of 3061

INFINITI QX56 2007 Factory Service Manual EC-494
< SERVICE INFORMATION >
DTC P1551, P1552 BATTERY CURRENT SENSOR
OK or NG
OK >> GO TO 9.
NG >> Replace battery negative cable assembly.
9.CHECK INTERMITTENT INCIDENT
Refer to EC-138
.
>>INSPECTI

Page 1578 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1553 BATTERY CURRENT SENSOR
EC-495
< SERVICE INFORMATION >
C
D
E
F
G
H
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J
K
L
MA
EC
N
P O
DTC P1553 BATTERY CURRENT SENSOR
Component DescriptionINFOID:0000000003532025
The power generation volta

DTC P1553 BATTERY CURRENT SENSOR
EC-495
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
DTC P1553 BATTERY CURRENT SENSOR
Component DescriptionINFOID:0000000003532025
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 ModeINFOID:0000000003532026
Specification data are reference values.
*: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to SC-4, "How to Handle Battery".
On Board Diagnosis LogicINFOID:0000000003532027
The MIL will not light up for this self-diagnosis.
NOTE:
If DTC P1553 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
EC-447
.
DTC Confirmation ProcedureINFOID:0000000003532028
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.
BBIA0744E
MONITOR ITEM CONDITION SPECIFICATION
BAT CUR SEN• Engine speed: Idle
• Battery: Fully charged*
• Selector lever: P or N
• Air conditioner switch: OFF
•No loadApprox. 2,600 - 3,500mV
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1553
1553Battery current sensor performanceThe signal voltage transmitted from the
sensor to ECM is higher than the amount
of the maximum power generation.• Harness or connectors
(The sensor circuit is open or shorted.)
• Battery current sensor

Page 1579 of 3061

INFINITI QX56 2007 Factory Service Manual EC-496
< SERVICE INFORMATION >
DTC P1553 BATTERY CURRENT SENSOR
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 E

Page 1580 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1553 BATTERY CURRENT SENSOR
EC-497
< SERVICE INFORMATION >
C
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MA
EC
N
P O
Wiring DiagramINFOID:0000000003532029
Specification data are reference values and are measured between e

Page 1581 of 3061

INFINITI QX56 2007 Factory Service Manual EC-498
< SERVICE INFORMATION >
DTC P1553 BATTERY CURRENT SENSOR
*: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to SC-4, "How to Handle Battery".
Diagnosis P

Page 1582 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1553 BATTERY CURRENT SENSOR
EC-499
< SERVICE INFORMATION >
C
D
E
F
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MA
EC
N
P O
3. Check voltage between battery current sensor terminal 1 and
ground with CONSULT-II or tester.
OK or N

Page 1583 of 3061

INFINITI QX56 2007 Factory Service Manual EC-500
< SERVICE INFORMATION >
DTC P1553 BATTERY CURRENT SENSOR
OK or NG
OK >> GO TO 9.
NG >> Replace battery negative cable assembly.
9.CHECK INTERMITTENT INCIDENT
Refer to EC-138
.
>>INSPECTION END

Page 1584 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1554 BATTERY CURRENT SENSOR
EC-501
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
DTC P1554 BATTERY CURRENT SENSOR
Component DescriptionINFOID:0000000003532032
The power generation volta

DTC P1554 BATTERY CURRENT SENSOR
EC-501
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
DTC P1554 BATTERY CURRENT SENSOR
Component DescriptionINFOID:0000000003532032
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 ModeINFOID:0000000003532033
Specification data are reference values.
*: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to SC-4, "How to Handle Battery".
On Board Diagnosis LogicINFOID:0000000003532034
The MIL will not light up for this self-diagnosis.
NOTE:
If DTC P1554 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
EC-447
.
Overall Function CheckINFOID:0000000003532035
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.
BBIA0744E
MONITOR ITEM CONDITION SPECIFICATION
BAT CUR SEN• Engine speed: Idle
• Battery: Fully charged*
• Selector lever: P or N
• Air conditioner switch: OFF
•No loadApprox. 2,600 - 3,500mV
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1554
1554Battery current sensor performanceThe 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

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