check engine light INFINITI FX35 2008 Workshop Manual

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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DTC P1572 ASCD BRAKE SWITCHEC-475
< SERVICE INFORMATION > [VQ35DE]
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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-477, "
Diagnosis Procedure".
If 1st trip DTC is not detected, 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-477, "
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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DTC P1574 ICC VEHICLE SPEED SENSOREC-481
< SERVICE INFORMATION > [VQ35DE]
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DTC P1574 ICC VEHIC
LE SPEED SENSOR
Component DescriptionINFOID:0000000001326344
The ECM receives two vehicle speed signals via CAN comm unication line. One is sent from “unified meter and
A/C amp.”, and the other is from TCM (Transmission control module). The ECM uses these signals for ICC
control. Refer to ACS-7
for ICC functions.
On Board Diagnosis LogicINFOID:0000000001326345
This self-diagnosis has the one trip detection logic.
 The MIL will not light up for this self-diagnosis.
NOTE:
 If DTC P1574 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-146
.
 If DTC P1574 is displayed with DTC U1010, first pe rform the trouble diagnosis for DTC U1010. Refer
to EC-148
.
 If DTC P1574 is displayed with DT C P0500, first perform the trouble diagnosis for DTC P0500. Refer
to EC-407
.
 If DTC P1574 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-422
.
DTC Confirmation ProcedureINFOID:0000000001326346
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:
Step 3 may be conducted with the dr ive wheels lifted in the shop or by driving the vehicle. If a road test
is expected to be easier, it is unnecessary to lift the vehicle.
1. Start engine.
2. Drive the vehicle at more than 40 km/h (25MPH).
3. Check DTC.
4. If DTC is detected, go to EC-481, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326347
1.CHECK DTC WITH TCM
Check DTC with TCM. Refer to AT- 3 8
.
OK or NG
OK >> GO TO 2.
NG >> Perform trouble shooting relevant to DTC indicated.
2.CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Refer to BRC-13
.
OK or NG
OK >> GO TO 3.
DTC No. Trouble Diagnosis
Name DTC Detecting Condit
ion Possible Cause
P1574
1574 ICC vehicle speed
sensor ECM detects a difference between two vehicle
speed signals is out of the specified range.  Harness or connectors
(CAN communication line is open or shorted.)
 Unified meter and A/C amp.
 ABS actuator and electric unit (control unit)
 Wheel sensor
TCM
ECM
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DTC P1574 ASCD VEHICLE SPEED SENSOR
EC-483
< SERVICE INFORMATION > [VQ35DE]
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DTC P1574 ASCD VEHIC
LE SPEED SENSOR
Component DescriptionINFOID:0000000001326348
The ECM receives two vehicle speed signals via CAN comm unication line. One is sent from “unified meter and
A/C amp.”, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD
control. Refer to EC-37
for ASCD functions.
On Board Diagnosis LogicINFOID:0000000001326349
This self-diagnosis has the one trip detection logic.
 The MIL will not light up for this self-diagnosis.
NOTE:
 If DTC P1574 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-146
.
 If DTC P1574 is displayed with DTC U1010, first pe rform the trouble diagnosis for DTC U1010. Refer
to EC-148
.
 If DTC P1574 is displayed with DT C P0500, first perform the trouble diagnosis for DTC P0500. Refer
to EC-407
If DTC P1574 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-422
DTC Confirmation ProcedureINFOID:0000000001326350
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:
Step 3 may be conducted with the dr ive wheels lifted 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. Drive the vehicle at more than 40 km/h (25 MPH).
3. Check DTC.
4. If DTC is detected, go to EC-483, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326351
1.CHECK DTC WITH TCM
Check DTC with TCM. Refer to AT- 3 8
.
OK or NG
OK >> GO TO 2.
NG >> Perform trouble shooting relevant to DTC indicated.
2.CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Refer to BRC-13
.
OK or NG
DTC No. Trouble Diagnosis
Name DTC Detecting Condit
ion Possible Cause
P1574
1574 ASCD vehicle speed
sensor ECM detects a difference between two vehicle
speed signals is out of the specified range.  Harness or connectors
(CAN communication line is open or shorted.)
 Unified meter and A/C amp.
 ABS actuator and electric unit (control unit)
 Wheel sensor
TCM
ECM
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DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)
EC-485
< SERVICE INFORMATION > [VQ35DE]
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DTC P1715 INPUT SPEED SENSOR (T
URBINE REVOLUTION SENSOR)
DescriptionINFOID:0000000001326352
ECM receives turbine revolution sensor signal from TCM through CAN communication line. ECM uses this
signal for engine control.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001326353
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001326354
NOTE:
If DTC P1715 is displayed with DTC U1000 or U 1001 first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-146
.
 If DTC P1715 is displayed with DTC U1010, first pe rform the trouble diagnosis for DTC U1010. Refer
to EC-148
.
 If DTC P1715 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-422
.
 If DTC P1715 is displayed with DT C P0335, first perform the trouble diagnosis for DTC P0335. Refer
to EC-319
.
 If DTC P1715 is displayed with DTC P0340 or P 0345 first perform the trouble diagnosis for DTC
P0340 or P0345. Refer to EC-324
.
The MIL will not lights up for this self-diagnosis.
Diagnosis ProcedureINFOID:0000000001326355
1.CHECK DTC WITH TCM
Check DTC with TCM. Refer to AT- 3 8
.
OK or NG
OK >> GO TO 2.
NG >> Perform trouble shooting relevant to DTC indicated.
2.REPLACE TCM
Replace TCM. Refer to AT- 4 1
.
>> INSPECTION END
MONITOR ITEM CONDITION SPECIFICATION
I/P PULLY SPD  Vehicle speed: More than 20 km/h (12MPH) Almost the same speed as the
tachometer indication
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1715
1715 Input speed sensor
(Turbine revolution sen-
sor)
(TCM output) Turbine revolution sensor signal is differ-
ent from the theoretical value calculated
by ECM from revolution sensor signal and
engine rpm signal.  Harness or connectors
(CAN communication line is open or shorted)
 Harness or connectors
(Turbine revolution sensor circuit is open or
shorted)
TCM
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EC-486
< SERVICE INFORMATION >[VQ35DE]
DTC P1805 BRAKE SWITCH
DTC P1805 BRAKE SWITCH
DescriptionINFOID:0000000001326356
Brake switch signal is applied to the ECM through t
he stop lamp switch when the brake pedal is depressed.
This signal is used mainly to decrease the engine speed when the vehicle is driving.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001326357
Specification data are reference values.
On Board Diagn osis LogicINFOID:0000000001326358
The MIL will not light up for this self-diagnosis.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode.
DTC Confirmation ProcedureINFOID:0000000001326359
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. Turn ignition switch ON.
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the DTC with CONSULT-III.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to EC-488, "
Diagnosis Procedure".
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW  Ignition switch: ON Brake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1805
1805 Brake switch A brake switch signal is not sent to ECM for ex-
tremely long time while the vehicle is driving.  Harness or connectors
(Stop lamp switch circuit is open or short-
ed.)
 Stop lamp switch
Engine operating condition in fail-safe mode
ECM controls the electric throttle control actuator by regulating the throttle opening to a small range.
Therefore, acceleration will be poor. Vehicle condition Driving condition
When engine is idling Normal When accelerating Poor acceleration
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EC-490
< SERVICE INFORMATION >[VQ35DE]
DTC P2100, P2103 THROTTLE
CONTROL MOTOR RELAY
DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
Component DescriptionINFOID:0000000001326363
Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle
control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends
an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition
switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not
provided to the ECM.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001326364
Specification data are reference values.
On Board Diagn osis LogicINFOID:0000000001326365
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MlL lights up.
DTC Confirmation ProcedureINFOID:0000000001326366
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.
PROCEDURE FOR DTC P2100
1. Turn ignition switch ON and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check DTC.
4. If DTC is detected, go to EC-492, "
Diagnosis Procedure".
With GST
Follow the procedure “With CONSULT-III” above.
PROCEDURE FOR DTC P2103
TESTING CONDITION:
Before performing the following procedure, co nfirm that battery voltage is more than 8V.
1. Turn ignition switch ON and wait at least 1 second.
2. Check DTC.
3. If DTC is detected, go to EC-492, "
Diagnosis Procedure".
MONITOR ITEM CONDITION SPECIFICATION
THRTL RELAY  Ignition switch: ON ON
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2100
2100 Throttle control motor
relay circuit open ECM detects a voltage of power source for
throttle control motor is excessively low.  Harness or connectors
(Throttle control moto r relay circuit is
open)
 Throttle control motor relay
P2103
2103 Throttle control motor
relay circuit short ECM detects the throttle control motor relay is
stuck ON.  Harness or connectors
(Throttle control moto r relay circuit is
shorted)
 Throttle control motor relay
Engine operating condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) b y the return
spring.
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EC-494
< SERVICE INFORMATION >[VQ35DE]
DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
DTC P2101 ELECTRIC THRO
TTLE CONTROL FUNCTION
DescriptionINFOID:0000000001326369
NOTE:
If DTC P2101 is displayed with DT C P2100 or 2119, first perform the trouble diagnosis for DTC P2100
or P2119. Refer to EC-490
or EC-504.
Electric throttle control actuator consists of th rottle control motor, throttle position sensor, etc.
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feed-
back to the ECM to control the throttle control mo tor to make the throttle valve opening angle properly in
response to driving condition.
On Board Diagn osis LogicINFOID:0000000001326370
This self-diagnosis has the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation ProcedureINFOID:0000000001326371
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 pr ocedure, confirm that battery voltage is more than 11V when the
engine is running.
1. Turn ignition switch ON and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check DTC.
4. If DTC is detected, go to EC-496, "
Diagnosis Procedure".
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2101
2101 Electric throttle control
performance Electric throttle control function does not oper-
ate properly.  Harness or connectors
(Throttle control motor circuit is open or
shorted)
 Electric throttle control actuator
Engine operating condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) b y the return
spring.
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EC-500
< SERVICE INFORMATION >[VQ35DE]
DTC P2118 THROTTLE CONTROL MOTOR
DTC P2118 THROTTLE CONTROL MOTOR
Component DescriptionINFOID:0000000001326376
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected
by the throttle position sensor and it provides feed-
back to the ECM to control the throttle control mo tor to make the throttle valve opening angle properly in
response to driving condition.
On Board Diagn osis LogicINFOID:0000000001326377
This self-diagnosis has the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation ProcedureINFOID:0000000001326378
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. Turn ignition switch ON and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check DTC.
4. If DTC is detected, go to EC-502, "
Diagnosis Procedure".
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2118
2118 Throttle control motor
circuit short ECM detects short in both circuits between
ECM and throttle control motor.  Harness or connectors
(Throttle control motor circuit is shorted.)
 Electric throttle control actuator
(Throttle control motor)
Engine operating condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) b y the return
spring.
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EC-504
< SERVICE INFORMATION >[VQ35DE]
DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOR
DTC P2119 ELECTRIC TH
ROTTLE CONTROL ACTUATOR
Component DescriptionINFOID:0000000001326383
Electric throttle control actuator consists of th rottle control motor, throttle position sensor, etc.
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The throttle position sensor detects the throttle va lve position, and the opening and closing speed of the throt-
tle valve and feeds the voltage signals to the ECM. T he ECM judges the current opening angle of the throttle
valve from these signals and the ECM controls the thrott le control motor to make the throttle valve opening
angle properly in response to driving condition.
On Board Diagn osis LogicINFOID:0000000001326384
This self-diagnosis has the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation ProcedureINFOID:0000000001326385
NOTE:
Perform PROCEDURE FOR MALFUNCTION A AND B first. If the DTC cannot be confirmed, perform
PROCEDURE FOR MALFUNCTION C.
 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.
PROCEDURE FOR MALFUNCTION A AND B
1. Turn ignition switch ON and wait at least 1 second.
2. Shift selector lever to D position and wait at least 3 seconds.
3. Shift selector lever to P, N position.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Turn ignition switch ON and wait at least 1 second.
6. Shift selector lever to D position and wait at least 3 seconds.
7. Shift selector lever to P, N position.
8. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
9. Check DTC.
10. If DTC is detected, go to EC-505, "
Diagnosis Procedure".
PROCEDURE FOR MALFUNCTION C
1. Turn ignition switch ON and wait at least 1 second.
2. Shift selector lever to D position and wait at least 3 seconds.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2119
2119 Electric throttle control
actuator A)
Electric throttle control
actuator does not func-
tion properly due to the return spring malfunc-
tion.  Electric throttle control actuator
B) Throttle valve opening angle in fail-safe mode is
not in specified range.
C) ECM detect the throttle valve is stuck open.
Detected items Engine operating condition in fail-safe mode
Malfunction A The ECM controls the electric throttle actuator by regulating the throttle opening around the idle position.
The engine speed will not rise more than 2,000 rpm.
Malfunction B ECM controls the electric throttle control actuator by regulating the throttle opening to 20 degrees or less.
Malfunction C While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or more.
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