2008 INFINITI FX35 sensor

EC-308
< SERVICE INFORMATION >[VQ35DE]
DTC P0300, P0301,
P0302, P0303, P0304, P0305, P0306 MULTIPLE CYLINDER
MISFIRE, NO. 1 - 6 CYLINDER MISFIRE
DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306 MULTIPLE CYL-
INDER MISFIRE, NO. 1 - 6 CYLINDER MISFIRE
On Board Diagnosis LogicINFOID:0000000001326131
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crank-
shaft position (CKP) sensor (POS) signal to vary , ECM can determine that a misfire is occurring.
The misfire detection logic consists of the following two conditions.
1. One Trip Detection Logic (Three Way Catalyst Damage) On the 1st trip that a misfire condition occurs that can damage the three way catalyst (TWC) due to over-
heating, the MIL will blink.
When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions
for a change.
When the misfire condition decreases to a level that will not damage the TWC, the MIL will turn off.
If another misfire condition occurs that can dam age the TWC on a second trip, the MIL will blink.
When the misfire condition decreases to a level that will not damage the TWC, the MIL will remain on.
If another misfire condition occurs that can damage the TWC, the MIL will begin to blink again.
2. Two Trip Detection Logic (Exhaust quality deterioration) For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only
light when the misfire is detected on a second trip. During this condition, the ECM monitors the CKP sen-
sor signal every 1,000 engine revolutions.
A misfire malfunction can be detected on any one cylinder or on multiple cylinders.
DTC Confirmation ProcedureINFOID:0000000001326132
CAUTION:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when driv-
ing.
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-III
1. Turn ignition switch ON, and select “DATA MONITOR” mode with CONSULT-III.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Restart engine and let it idle for about 15 minutes.
Sensor Input Signal to ECM ECM function
Crankshaft position sensor (POS) Engine speed On board diagnosis of misfire
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0300
0300 Multiple cylinder misfire
detected
Multiple cylinder misfire.
 Improper spark plug
 Insufficient compression
 Incorrect fuel pressure
 Fuel injector circuit is open or shorted
 Fuel injector
 Intake air leak
 Ignition signal circuit is open or shorted
 Lack of fuel
 Signal plate
 Air fuel ratio (A/F) sensor 1
 Incorrect PCV hose connection
P0301
0301
No.1 cylinder misfire de-
tected
No. 1 cylinder misfires.
P0302
0302 No. 2 cylinder misfire
detected
No. 2 cylinder misfires.
P0303
0303 No. 3 cylinder misfire
detected
No. 3 cylinder misfires.
P0304
0304 No. 4 cylinder misfire
detected
No. 4 cylinder misfires.
P0305
0305 No. 5 cylinder misfire
detected
No. 5 cylinder misfires.
P0306
0306 No. 6 cylinder misfire
detected
No. 6 cylinder misfires.
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DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306 MULTIPLE CYLINDER
MISFIRE, NO. 1 - 6 CYLINDER MISFIRE
EC-313
< SERVICE INFORMATION > [VQ35DE]
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NG >> Follow the
EC-80, "Basic Inspection".
14.CHECK AIR FUEL RATIO (A/F) SENSOR 1 INPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between the following terminals. Refer to Wiring Diagram.
5. Check harness continuity between the following terminals and ground. Refer to Wiring Diagram.
6. Also check harness for short to power or short to ground.
OK or NG
OK >> GO TO 15.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
15.CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER
Refer to EC-158, "
Component Inspection".
OK or NG
OK >> GO TO 16.
NG >> Replace malfunctioning air fuel ratio (A/F) sensor 1.
16.CHECK MASS AIR FLOW SENSOR
A/F sensor 1 terminal ECM terminal
Bank 1 116
275
535
656
Bank 2 176
277
557
658
Continuity should exist.
Bank 1 Bank 2
A/F sensor 1 terminal ECM terminal A/F sensor 1 terminal ECM terminal 116176
275277
535557
656658
Continuity should not exist.
PBIB2093E
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EC-314
< SERVICE INFORMATION >[VQ35DE]
DTC P0300, P0301,
P0302, P0303, P0304, P0305, P0306 MULTIPLE CYLINDER
MISFIRE, NO. 1 - 6 CYLINDER MISFIRE
With CONSULT-III
Check mass air flow sensor signal in “DATA MONITOR” mode with CONSULT-III.
With GST
Check mass air flow sensor signal in Service $01 with GST.
OK or NG
OK >> GO TO 17.
NG >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-175
.
17.CHECK SYMPTOM MATRIX CHART
Check items on the rough idle symptom in EC-96, "
Symptom Matrix Chart".
OK or NG
OK >> GO TO 18.
NG >> Repair or replace.
18.ERASE 1ST TRIP DTC
Some tests may cause a 1st trip DTC to be set.
Erase the 1st trip DTC from the ECM memo ry after performing the tests. Refer to EC-55, "
Emission-Related
Diagnostic Information".
>> GO TO 19.
19.CHECK INTERMITTENT INCIDENT
Refer to EC-139
.
>> INSPECTION END
2.0 - 6.0 g·m/sec: at idling
7.0 - 20.0 g·m/sec: at 2,500 rpm
2.0 - 6.0 g·m/sec: at idling
7.0 - 20.0 g·m/sec: at 2,500 rpm
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DTC P0327, P0328 KSEC-315
< SERVICE INFORMATION > [VQ35DE]
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DTC P0327, P0328 KS
Component DescriptionINFOID:0000000001326134
The knock sensor (KS) is attached
to the cylinder block. It senses
engine knocking using a piezoelectric element. A knocking vibration
from the cylinder block is sensed as vibrational pressure. This pres-
sure is converted into a voltage signal and sent to the ECM.
On Board Diagnosis LogicINFOID:0000000001326135
The MIL will not light up for these self-diagnoses.
DTC Confirmation ProcedureINFOID:0000000001326136
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, 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 10V at idle.
1. Start engine and run it for at least 5 seconds at idle speed.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to EC-317, "
Diagnosis Procedure".
PBIB1564E
DTC No.Trouble diagnosis
name DTC detected condition Possible cause
P0327
0327 Knock sensor circuit
low input An excessively low voltage from the sensor is
sent to ECM.
 Harness or connectors
(Knock sensor circuit is open or shorted.)
 Knock sensor
P0328
0328 Knock sensor circuit
high input An excessively high voltage from the sensor is
sent to ECM.
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DTC P0327, P0328 KSEC-317
< SERVICE INFORMATION > [VQ35DE]
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Diagnosis ProcedureINFOID:0000000001326138
1.CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check resistance between ECM terminal 15 and ground. Refer to Wiring Diagram. NOTE:
It is necessary to use an ohmmeter which can measure more than 10 M Ω.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2.CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II
1. Disconnect knock sensor harness connector.
2. Check harness continuity between ECM terminal 15 and knock sensor terminal 1.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors F20, F252
 Harness for open or short between ECM and knock sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK KNOCK SENSOR
Refer to EC-318, "
Component Inspection".
OK or NG
OK >> GO TO 5.
NG >> Replace knock sensor.
5.CHECK GROUND CONNECTIONS
TER- MI-
NAL
NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
15 W Knock sensor [Engine is running]
 Idle speedApproximately 2.5V
Resistance: Approximately 532 - 588 k
Ω [at 20 °C (68 °F)]
Continuity should exist.
PBIB1564E
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EC-318
< SERVICE INFORMATION >[VQ35DE]
DTC P0327, P0328 KS
Loosen and retighten ground screw on the body. Refer to
EC-144, "Ground Inspection".
OK or NG
OK >> GO TO 6.
NG >> Repair or replace ground connections.
6.CHECK KNOCK SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT
1. Disconnect knock sensor harness connector.
2. Check harness continuity between knock sensor terminal 2 and ground.
Refer to Wiring Diagram.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors F20, F252
 Harness connectors F102, M82
 Harness for open or short between knock sensor terminal 2 and ground
>> Repair open circuit or short power in harness or connectors.
8.CHECK INTERMITTENT INCIDENT
Refer to EC-139
.
>> INSPECTION END
Component InspectionINFOID:0000000001326139
KNOCK SENSOR
Check resistance between knock sensor terminal 1 and ground.
NOTE:
It is necessary to use an ohmmeter which can measure more
than 10 M Ω.
CAUTION:
Do not use any knock sensors th at have been dropped or phys-
ically damaged. Use only new ones.
Removal and InstallationINFOID:0000000001326140
KNOCK SENSOR
Refer to EM-241.
PBIB2625E
Continuity should exist.
Resistance: Approximately 532 - 588 k Ω [at 20 °C (68 °F)]
SEF111Y
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DTC P0335 CKP SENSOR (POS)EC-319
< SERVICE INFORMATION > [VQ35DE]
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DTC P0335 CKP SENSOR (POS)
Component DescriptionINFOID:0000000001326141
The crankshaft position (CKP) sensor (POS) is located on the oil pan
facing the gear teeth (cogs) of the si
gnal plate. It detects the fluctua-
tion of the engine revolution.
The sensor consists of a permanent magnet and Hall IC.
When the engine is running, the high and low parts of the teeth
cause the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
Due to the changing magnetic fiel d, the voltage from the sensor
changes.
The ECM receives the voltage signal and detects the fluctuation of
the engine revolution.
ECM receives the signals as shown in the figure.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001326142
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001326143
DTC Confirmation ProcedureINFOID:0000000001326144
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm th at battery voltage is more than 10.5V with igni-
tion switch ON.
1. Crank engine for at least 2 seconds and run it for at least 5 seconds at idle speed.
2. Check 1st trip DTC.
PBIB0562E
PBIB2744E
MONITOR ITEM CONDITION SPECIFICATION
ENG SPEED  Run engine and compare CONSULT-III value with the tachometer
indication. Almost the same speed as the tachometer
indication.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0335
0335 Crankshaft position sen-
sor (POS) circuit  The crankshaft position sensor (POS) signal
is not detected by the ECM during the first
few seconds of engine cranking.
 The proper pulse signal from the crankshaft position sensor (POS) is not sent to ECM
while the engine is running.
 The crankshaft position sensor (POS) signal is not in the normal pattern during engine run-
ning.  Harness or connectors
[Crank shaft position sensor (POS) circuit
is open or shorted]
 Crankshaft position sensor (POS)
 Signal plate
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EC-320
< SERVICE INFORMATION >[VQ35DE]
DTC P0335 CKP SENSOR (POS)
3. If 1st trip DTC is detected, go to
EC-321, "Diagnosis Procedure".
Wiring DiagramINFOID:0000000001326145
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.
TBWM1387E
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