Nissan Sentra. Manual — part 420
EC-376
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P1550 BATTERY CURRENT SENSOR
5. Turn ignition switch ON.
6. Check the voltage between ECM harness connector terminals.
Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace battery current sensor. Refer to
PG-53, "Removal and Installation"
.
ECM
Voltage
(Approx.)
Connector
+
-
Terminal
F25
63
62
2.5 V
P1551, P1552 BATTERY CURRENT SENSOR
EC-377
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P1551, P1552 BATTERY CURRENT SENSOR
DTC Logic
INFOID:0000000009758630
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
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 8 V with ignition
switch ON
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009758631
1.
CHECK BATTERY CURRENT SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect battery current sensor harness connector.
3. Turn ignition switch ON.
4. Check the voltage between battery current sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK SENSOR POWER SUPPLY 2 CIRCUIT
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1551
BAT CURRENT SENSOR
(Battery current sensor)
An excessively low voltage from the sen-
sor is sent to ECM.
• Harness or connectors
(Battery current sensor circuit is open
or shorted.)
• Battery current sensor
• Camshaft position sensor
• Camshaft (Intake)
• Starter motor
• Starting system circuit
• Dead (Weak) battery
• Sensor power supply 1 circuit
P1552
BAT CURRENT SENSOR
(Battery current sensor)
An excessively high voltage from the sen-
sor is sent to ECM.
+
−
Voltage
(Approx.)
Battery current sensor
Connector
Terminal
F54
1
Ground
5.0 V
EC-378
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P1551, P1552 BATTERY CURRENT SENSOR
Check sensor power supply 2 circuit. Refer to
.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
3.
CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT
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 power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT
1. Check the continuity between battery current sensor harness connector and ECM harness connector.
2. Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts
5.
CHECK BATTERY CURRENT SENSOR
Check the battery current sensor. Refer to
EC-378, "Component Inspection (Battery Current Sensor)"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace battery current sensor. Refer to
PG-53, "Removal and Installation"
.
Component Inspection (Battery Current Sensor)
INFOID:0000000009758632
1.
CHECK BATTERY CURRENT SENSOR
1. Turn ignition switch OFF.
2. Reconnect harness connectors disconnected.
3. Disconnect battery negative cable.
4. Install jumper cable between battery negative terminal and body
ground.
+
−
Continuity
Battery current sensor
ECM
Connector
Terminal
Connector
Terminal
F54
3
F25
62
Existed
+
−
Continuity
Battery current sensor
ECM
Connector
Terminal
Connector
Terminal
F54
4
F25
63
Existed
JPBIA3286ZZ
P1551, P1552 BATTERY CURRENT SENSOR
EC-379
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
5. Turn ignition switch ON.
6. Check the voltage between ECM harness connector terminals.
Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace battery current sensor. Refer to
PG-53, "Removal and Installation"
ECM
Voltage
(Approx.)
Connector
+
-
Terminal
F25
63
62
2.5 V
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