Nissan Altima L32. Instruction — part 538
P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-1273
< COMPONENT DIAGNOSIS >
[VQ35DE]
C
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EC
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2. Listen to each fuel injector operating sound.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Perform trouble diagnosis for FUEL INJECTOR, refer to
EC-1483, "Diagnosis Procedure"
7.
CHECK FUEL INJECTOR
1. Remove fuel injector assembly. Refer to
EM-146, "Removal and Installation"
.
Keep fuel hose and all fuel injectors connected to fuel tube.
2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
3. Disconnect all fuel injector harness connectors.
4. Disconnect all ignition coil harness connectors.
5. Prepare pans or saucers under each fuel injector.
6. Crank engine for approximately 3 seconds.
Check that fuel does not drip from fuel injector.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace the fuel injectors from which fuel is dripping. Always replace O-ring with new one.
8.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
>> INSPECTION END
PBIB3332E
EC-1274
< COMPONENT DIAGNOSIS >
[VQ35DE]
P0181 FTT SENSOR
P0181 FTT SENSOR
Description
INFOID:0000000004362113
The fuel tank temperature sensor is used to detect the fuel tempera-
ture inside the fuel tank. The sensor modifies a voltage signal from
the ECM. The modified signal returns to the ECM as the fuel temper-
ature input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.
<Reference data>
*: These data are reference values and are measured between ECM terminals 95 (Fuel tank temperature sensor) and 104 (Sensor
ground).
DTC Logic
INFOID:0000000004362114
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.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE-I
1. Turn ignition switch ON and wait at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
EC-1275, "Diagnosis Procedure"
NO
>> GO TO 3.
3.
CHECK ENGINE COOLANT TEMPERATURE
With CONSULT-III
1. Select “COOLAN TEMP/S” in “DATA MONITOR” with CONSULT-III.
2. Check “COOLAN TEMP/S” value.
With GST
Follow the procedure “With CONSULT-III” above.
Is “COOLAN TEMP/S” less than 60
°C (140°F)?
YES
>> INSPECTION END
NO
>> GO TO 4.
Fluid temperature
[
°C (°F)]
Voltage*
(V)
Resistance
(k
Ω)
20 (68)
3.5
2.3 - 2.7
50 (122)
2.2
0.79 - 0.90
SEF012P
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0181
Fuel tank temperature
sensor circuit range/per-
formance
Rationally incorrect voltage from the sensor is
sent to ECM, compared with the voltage signals
from engine coolant temperature sensor and in-
take air temperature sensor.
• Harness or connectors
(The sensor circuit is open or shorted)
• Fuel tank temperature sensor
P0181 FTT SENSOR
EC-1275
< COMPONENT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
4.
PERFORM DTC CONFIRMATION PROCEDURE-II
With CONSULT-III
1. Cool engine down until “COOLAN TEMP/S” is less than 60
°C (140°F).
2. Wait at least 10 seconds.
3. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES
>> Go to
EC-1275, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004362115
1.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect “fuel level sensor unit and fuel pump” harness connector.
3. Turn ignition switch ON.
4. Check the voltage between “fuel level sensor unit and fuel
pump” harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B10, E29
• Harness for open or short between ECM and “fuel level sensor unit and fuel pump”
>> Repair open circuit, short to ground or short to power in harness or connector.
4.
CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between “fuel level sensor unit and fuel pump” 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 6.
Fuel level sensor unit and fuel pump
Ground
Voltage
Connector
Terminal
B42
4
Ground
Approx. 5 V
PBIB0932E
Fuel level sensor unit and fuel pump
ECM
Continuity
Connector
Terminal
Connector
Terminal
B42
5
E10
104
Existed
EC-1276
< COMPONENT DIAGNOSIS >
[VQ35DE]
P0181 FTT SENSOR
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B1, M6
• Harness connectors E30, M1
• Harness for open or short between “fuel level sensor unit and fuel pump” and ECM
>> Repair open circuit, short to ground or short to power in harness or connector.
6.
CHECK FUEL TANK TEMPERATURE SENSOR
EC-1276, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace “fuel level sensor unit and fuel pump”.
7.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000004362116
1.
CHECK FUEL TANK TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Remove fuel level sensor unit.
3. Check resistance between “fuel level sensor unit and fuel pump”
terminals by heating with hot water as shown in the figure.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace “fuel level sensor unit and fuel pump”.
Terminals
Condition
Resistance
4 and 5
Temperature [
°C (°F)]
20 (68)
2.3 - 2.7 k
Ω
50 (122)
0.79 - 0.90 k
Ω
PBIB0931E
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