Nissan Pathfinder (2008 year). Instruction - part 335
P1551, P1552 BATTERY CURRENT SENSOR
EC-797
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P1551, P1552 BATTERY CURRENT SENSOR
Component Description
INFOID:0000000001537912
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.
: Vehicle front
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.
On Board Diagnosis Logic
INFOID:0000000001537913
The MIL will not light up for these self-diagnoses.
NOTE:
If DTC P1551 or P1552 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to
.
DTC Confirmation Procedure
INFOID:0000000001537914
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8V with ignition
switch ON
1.
Turn ignition switch ON.
2.
Wait at least 10 seconds.
3.
Check 1st trip DTC.
4.
If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000001537915
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten ground screws on the body.
ALBIA0362ZZ
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1551
1551
Battery current sensor circuit
low input
An excessively low voltage from the sensor
is sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted.)
• Battery current sensor
P1552
1552
Battery current sensor circuit
high input
An excessively high voltage from the sensor
is sent to ECM.