2008 INFINITI FX35 ECU

EC-390
< SERVICE INFORMATION >[VQ35DE]
DTC P0455 EVAP CONTROL SYSTEM
OK or NG
OK >> GO TO 3.
NG >> 1. Open fuel filler cap, then clean cap and
fuel filler neck threads using air blower.
2. Retighten until ratcheting sound is heard.
3.CHECK FUEL FILLER CAP FUNCTION
Check for air releasing sound while opening the fuel filler cap.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4.CHECK FUEL TANK VACUUM RELIEF VALVE
Refer to EC-42, "
Component Inspection".
OK or NG
OK >> GO TO 5.
NG >> Replace fuel filler cap with a genuine one.
5.CHECK EVAP PURGE LINE
Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks, improper connection or
disconnection.
Refer to EC-40, "
Description".
OK or NG
OK >> GO TO 6.
NG >> Repair or reconnect the hose.
6.CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
>> GO TO 7.
7.CHECK EVAP CANISTER VENT CONTROL VALVE
Check the following.
 EVAP canister vent control valve is installed properly. Refer to EC-44, "
Removal and Installation".
 EVAP canister vent control valve.
Refer to EC-364, "
Component Inspection".
OK or NG
OK >> GO TO 8.
NG >> Repair or replace EVAP cani ster vent control valve and O-ring.
8.INSTALL THE PRESSURE PUMP
To locate the EVAP leak, install EVAP service port adapter and pres-
sure pump to EVAP service port securely.
NOTE:
Improper installation of the EV AP service port adapter to the
EVAP service port may cause leaking.
PBIB2097E
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DTC P0456 EVAP CONTROL SYSTEMEC-395
< SERVICE INFORMATION > [VQ35DE]
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DTC Confirmation ProcedureINFOID:0000000001326223
NOTE:

If DTC P0456 is displayed with P0442, firs t perform trouble diagnosis for DTC P0456.
 After repair, make sure that the hoses and clips are installed properly.
 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:
 Open engine hood before conducting following procedure.
 If any of following conditions ar e met just before the DTC confir mation procedure, leave the vehicle
for more than 1 hour.
- Fuel filler cap is removed.
- Fuel is refilled or drained.
- EVAP component parts is/are removed.
 Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
2. Make sure the following conditions are met.
FUEL LEVEL SE: 0.25 - 1.4V
COOLAN TEMP/S: 0 - 32 °C (32 - 90 °F)
FUEL T/TMP SE: 0 - 35 °C (32 - 95 °F)
INT/A TEMP SE: More than 0 °C (32 °F)
If NG, turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle) or refilling/draining
fuel until the output voltage condition of the “FUE L LEVEL SE” meets within the range above and leave
the vehicle for more than 1 hour. Then start from step 1).
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Select “EVAP V/S LEAK P0456/P1456” of “EVAPO RATIVE SYSTEM” in “DTC WORK SUPPORT” mode
with CONSULT-III.
Follow the instruction displayed.
6. Make sure that “OK” is displayed.
If “NG” is displayed, refer to EC-396, "
Diagnosis Procedure".
NOTE:
 If the engine speed cannot be maintained within the range disp layed on CONSULT-III screen, go
to EC-80, "
Basic Inspection".
 Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid
valve properly.
Overall Function CheckINFOID:0000000001326224
WITH GST
Use this procedure to check the overall function of the EV AP very small leak function. During this check, a 1st
trip DTC might not be confirmed.
CAUTION:
 Never use compressed air, doing so may damage the EVAP system.
 Do not start engine.
 Do not exceeded 4.12 kPa (0.042 kg/cm
2, 0.6 psi).
1. Attach the EVAP service port adapter securely to the EVAP ser- vice port.
PBIB2097E
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DTC P0456 EVAP CONTROL SYSTEMEC-397
< SERVICE INFORMATION > [VQ35DE]
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5.INSTALL THE PRESSURE PUMP
To locate the EVAP leak, install EVAP service port adapter and pres-
sure pump to EVAP service port securely. For the location of EVAP
service port, refer to EC-40, "
Description".
NOTE:
Improper installation of the EV AP service port adapter to the
EVAP service port may cause leaking.
With CONSULT-III>>GO TO 6.
Without CONSULT-III>>GO TO 7.
6.CHECK FOR EVAP LEAK
With CONSULT-III
1. Turn ignition switch ON.
2. Select “EVAP SYSTEM CLOSE” of “WORK SUPPORT” mode with CONSULT-III.
3. Touch “START” and apply pressure into the EVAP li ne until the pressure indicator reaches the middle of
the bar graph.
CAUTION:
 Never use compressed air or a high pressure pump.
 Do not exceed 4.12 kPa (0.042 kg/cm
2, 0.6 psi) of pressure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details.
Refer to EC-40, "
Description".
OK or NG
OK >> GO TO 8.
NG >> Repair or replace.
7.CHECK FOR EVAP LEAK
Without CONSULT-III
1. Turn ignition switch OFF.
PBIB2097E
SEF916U
SEF200U
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DTC P0460 FUEL LEVEL SENSOREC-401
< SERVICE INFORMATION > [VQ35DE]
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DTC P0460 FUEL LEVEL SENSOR
Component DescriptionINFOID:0000000001326226
The fuel level sensor is mounted in the fuel level sensor unit. The
sensor detects a fuel level in the fuel tank and transmits a signal to
the “unified meter and A/C amp.”. The “unified meter and A/C amp.”
sends the fuel level sensor si
gnal to the ECM through CAN commu-
nication line.
It consists of two parts, one is mechanical float and the other is vari-
able resistor. Fuel level sensor output voltage changes depending on
the movement of the fuel mechanical float.
On Board Diagnosis LogicINFOID:0000000001326227
NOTE:
 If DTC P0460 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-146
.
 If DTC P0460 is displayed with DTC U1010, first pe rform the trouble diagnosis for DTC U1010. Refer
to EC-148
.
When the vehicle is parked, naturally the fuel level in the fuel tank is stable. It means that output signal of the
fuel level sensor does not change. If ECM senses sloshi ng signal from the sensor, fuel level sensor malfunc-
tion is detected.
DTC Confirmation ProcedureINFOID:0000000001326228
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.
1. Start engine and wait maximum of 2 consecutive minutes.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to EC-401, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326229
1.CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
Refer to DI-27, "
CONSULT-III Function (METER/M&A)".
OK or NG
OK >> GO TO 2.
NG >> Go to DI-19, "
Fuel Level Sensor Signal Inspection".
2.CHECK INTERMITTENT INCIDENT
Refer to EC-139
.
>> INSPECTION END
PBIB1569E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0460
0460 Fuel level sensor circuit
noise Even though the vehicle is parked, a signal be-
ing varied is sent from the fuel level sensor to
ECM.  Harness or connectors
(CAN communication line is open or
shorted)
 Harness or connectors
(Fuel level sensor circuit is open or short-
ed)
 Unified meter and A/C amp.
 Fuel level sensor
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DTC P0500 VSSEC-407
< SERVICE INFORMATION > [VQ35DE]
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DTC P0500 VSS
DescriptionINFOID:0000000001326241
NOTE:

If DTC P0500 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-146
.
 If DTC P0500 is displayed with DTC U1010, first pe rform the trouble diagnosis for DTC U1010. Refer
to EC-148
.
The vehicle speed signal is sent to the “unified meter and A/C amp.” from the “ABS actuator and electric unit
(control unit)” by CAN communication line. The “unifi ed meter and A/C amp.” then sends a signal to the ECM
by CAN communication line.
On Board Diagnosis LogicINFOID:0000000001326242
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode.
DTC Confirmation ProcedureINFOID:0000000001326243
CAUTION:
Always drive vehicle at a safe speed.
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:
Steps 1 and 2 may be conducted with the drive wheels li fted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.
WITH CONSULT-III
1. Start engine (TCS switch or VDC switch OFF).
2. Read “VHCL SPEED SE” in “DATA MONITOR” m ode with CONSULT-III. The vehicle speed on CON-
SULT-III should exceed 10 km/h (6 MPH) when rotating wheels with suitable gear position.
If NG, go to EC-408, "
Diagnosis Procedure".
If OK, go to following step.
3. Select “DATA MONITOR” mode with CONSULT-III.
4. Warm engine up to normal operating temperature.
5. Maintain the following conditions for at least 60 consecutive seconds.
6. Check 1st trip DTC.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0500
0500 Vehicle speed sensor
(VSS) The almost 0 km/h (0 MPH) signal from
vehicle speed sensor is sent to ECM even
when vehicle is being driven.  Harness or connectors
(CAN communication line is open or shorted)
 Harness or connectors
(Vehicle speed signal circuit is open or shorted)
 Wheel sensor
 Unified meter and A/C amp.
 ABS actuator and electric unit (control unit)
Detected items Engine operating condition in fail-safe mode
Vehicle speed sensor When the fail-safe system for vehicle speed sensor is activated, the cooling fan operates (High) while
engine is running.
ENG SPEED 1,700 - 6,000 rpm
COOLAN TEMP/S More than 70
°C (158 °F)
B/FUEL SCHDL 5.0 - 31.8 msec
Selector lever Except P or N position
PW/ST SIGNAL OFF
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DTC P0850 PNP SWITCHEC-429
< SERVICE INFORMATION > [VQ35DE]
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DTC P0850 PNP SWITCH
Component DescriptionINFOID:0000000001326275
When the selector lever position is P or N,
park/neutral position (PNP) switch is ON.
ECM detects the position because the continuity of the line (the ON signal) exists.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001326276
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001326277
DTC Confirmation ProcedureINFOID:0000000001326278
CAUTION:
Always drive vehicle at a safe speed.
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.
2. Select “P/N POSI SW” in “DATA MONITOR” mode wit h CONSULT-III. Then check the “P/N POSI SW” sig-
nal under the following conditions.
If NG, go to EC-432, "
Diagnosis Procedure".
If OK, go to following steps.
3. Select “DATA MONITOR” mode with CONSULT-III.
4. Start engine and warm it up to normal operating temperature.
5. Maintain the following conditions for at least 60 consecutive seconds.
6. Check 1st trip DTC,
7. If 1st trip DTC is detected, go to EC-432, "
Diagnosis Procedure".
MONITOR ITEM CONDITION SPECIFICATION
P/N POSI SW  Ignition switch: ON Selector lever: P or N ON
Selector lever: Except above OFF
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0850
0850 Park/neutral position
switch The signal of the park/neutral position (PNP)
switch is not changed in the process of engine
starting and driving.  Harness or connectors
[Park/neutral position (PNP) switch circuit
is open or shorted.]
 Park/neutral position (PNP) switch
 Unified meter and A/C amp.
Position (Selector lever) Known-good signal
P or N position ON
Except above position OFF
ENG SPEED 1,000 - 6,375 rpm
COOLAN TEMP/S More than 70 °C (158 °F)
B/FUEL SCHDL 2.0 - 31.8 msec
VHCL SPEED SE More th an 64 km/h (40 MPH)
Selector lever Suitable position
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DTC P1572 ICC BRAKE SWITCHEC-465
< SERVICE INFORMATION > [VQ35DE]
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DTC P1572 ICC BRAKE SWITCH
Component DescriptionINFOID:0000000001326330
When the brake pedal is depressed, ICC brake switch is turned OFF
and stop lamp switch is turned ON. ECM detects the state of the
brake pedal by this input of two kinds (ON/OFF signal).
Refer to
ACS-7
for the ICC function.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001326331
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001326332
This self-diagnosis has the one trip detection logic.
 The MIL will not light up for this self-diagnosis.
NOTE:
 If DTC P1572 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-422
This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not
stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when igniti on switch OFF. And even when ma lfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
DTC Confirmation ProcedureINFOID:0000000001326333
CAUTION:
Always drive vehicle at a safe speed.
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.
PBIB1539E
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW1
(ICC brake switch)  Ignition switch: ON Brake pedal: Fully released ON
 Brake pedal: Slightly depressed OFF
BRAKE SW2
(Stop lamp switch)  Ignition switch: ON Brake pedal: Fully released OFF
 Brake pedal: Slightly depressed ON
DTC No.
Trouble Diagnosis
Name DTC Detecting Condition Possible Cause
P1572
1572 ICC brake switch A)
When the vehicle speed is above 30km/h (19
MPH), ON signals from the stop lamp switch
and the ICC brake switch are sent to ECM at
the same time.  Harness or connectors
(Stop lamp switch circuit is shorted.)
 Harness or connectors (ICC brake switch circuit is shorted.)
 Stop lamp switch
 ICC brake switch
 ICC brake hold relay
 Incorrect stop lamp switch installation
 Incorrect ICC brake switch installation
ECM
B)
ICC brake switch signal is not sent to ECM
for extremely long time while the vehicle is
driving
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EC-466
< SERVICE INFORMATION >[VQ35DE]
DTC P1572 ICC BRAKE SWITCH
 Procedure for malfunction B is not described here. It
takes extremely long time to complete procedure for
malfunction B. By performing procedur e for malfunction A, the incident that causes malfunction B can be
detected.
TESTING CONDITION:
Steps 4 and 5 may be conducted with the drive wheels li fted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.
WITH CONSULT-III
1. Start engine.
2. Select “DATA MONITOR” mode with CONSULT-III.
3. Press MAIN switch and make sure that CRUISE indicator lights up.
4. Drive the vehicle for at least 5 consecutive seconds under the following condition.
5. Check 1st trip DTC. If 1st trip DTC is detected, go to EC-468, "
Diagnosis Procedure".
If 1st trip DTC is not detec ted, go to the following step.
6. Drive the vehicle for at least 5 consecutive seconds under the following condition.
7. Check 1st trip DTC.
8. If 1st trip DTC is detected, go to EC-468, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III” above.
VHCL SPEED SE More than 30 km/h (19 MPH)
Selector lever Suitable position
VHCL SPEED SE More than 30 km/h (19 MPH)
Selector lever Suitable position
Driving location Depress the brake pedal for more than
five seconds so as not to come off from
the above-mentioned vehicle speed.
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