2008 INFINITI FX35 check engine

EC-416
< SERVICE INFORMATION >[VQ35DE]
DTC P0550 PSP SENSOR
3. Check voltage between PSP sensor terminal 1 and ground with
CONSULT-III or tester.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
3.CHECK POWER STEERING PRESSURE SENSO R GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between PSP sensor terminal 3 and ECM terminal 67. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK POWER STEERING PRESSURE SENSOR INPU T SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 12 and PSP sensor terminal 2. Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK POWER STEERING PRESSURE SENSOR
Refer to EC-416, "
Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> Replace power steering pressure sensor.
6.CHECK INTERMITTENT INCIDENT
Refer to EC-139
.
>> INSPECTION END
Component InspectionINFOID:0000000001326260
POWER STEERING PRESSURE SENSOR
1. Reconnect all harness connectors disconnected.
2. Start engine and let it idle. Voltage: Approximately 5V
PBIB0188E
Continuity should exist.
Continuity should exist.
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EC-418
< SERVICE INFORMATION >[VQ35DE]
DTC P0603 ECM POWER SUPPLY
DTC P0603 ECM POWER SUPPLY
Component DescriptionINFOID:0000000001326262
Battery voltage is supplied to the ECM even when the ignition switch
is turned OFF for the ECM memory function of the DTC memory, the
air-fuel ratio feedback compensation value memory, the idle air vol-
ume learning value memory, etc.
On Board Diagn
osis LogicINFOID:0000000001326263
DTC Confirmation ProcedureINFOID:0000000001326264
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 1 second.
2. Start engine and let it idle for 1 second.
3. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
4. Repeat steps 2 and 3 for four times.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to EC-420, "
Diagnosis Procedure".
PBIB1164E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0603
0603 ECM power supply cir-
cuit ECM back-up RAM system does not function
properly.  Harness or connectors
[ECM power supply (b ack-up) circuit is
open or shorted.]
ECM
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EC-422
< SERVICE INFORMATION >[VQ35DE]
DTC P0605 ECM
DTC P0605 ECM
Component DescriptionINFOID:0000000001326267
The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.
On Board Diagn
osis LogicINFOID:0000000001326268
This self-diagnosis has one or two trip detection logic.
FAIL-SAFE MODE
ECM enters fail-safe mode when the malfunction A is detected.
DTC Confirmation ProcedureINFOID:0000000001326269
Perform “PROCEDURE FOR MALFUNCTION A” first. If the 1st trip DTC cannot be confirmed, perform
PROCEDURE FOR MALFUNCTION B. If there is no malfunction on PROCEDURE FOR MALFUNCTION
B, perform PROCEDURE FOR MALFUNCTION C.
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 MALFUNCTION A
1. Turn ignition switch ON.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to EC-423, "
Diagnosis Procedure".
PROCEDURE FOR MALFUNCTION B
With CONSULT-III
1. Turn ignition switch ON and wait at least 1 second.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to EC-423, "
Diagnosis Procedure".
PROCEDURE FOR MALFUNCTION C
With CONSULT-III
1. Turn ignition switch ON and wait at least 1 second.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
PBIB1164E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0605
0605 Engine control module A) ECM calculation function is malfunctioning.
ECM
B) ECM EEP-ROM system is malfunctioning.
C) ECM self shut-off function is malfunctioning.
Detected items Engine operation condition in fail-safe mode
Malfunction A  ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5
degrees) by the return spring.
 ECM deactivates ICC operation.
 ECM deactivates ASCD operation.
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EC-424
< SERVICE INFORMATION >[VQ35DE]
DTC P0643 SENSOR POWER SUPPLY
DTC P0643 SENSOR POWER SUPPLY
On Board Diagn
osis LogicINFOID:0000000001326271
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:0000000001326272
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 8V at idle.
1. Start engine and let it idle for 1 second.
2. Check DTC.
3. If DTC is detected, go to EC-426, "
Diagnosis Procedure".
DTC No.Trouble diagnosis
name DTC detecting condition Possible cause
P0643
0643 Sensor power supply
circuit short ECM detects a voltage of power source for
sensor is excessively low or high.  Harness or connectors
(APP sensor 1 circuit is shorted.)
(PSP sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is short-
ed.)
(EVAP control system pressure sensor circuit
is shorted.)
 Accelerator pedal position sensor (APP sensor 1)
 EVAP control system pressure sensor
 Power steering pressure sensor
 Refrigerant pressure sensor
Engine operation 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-426
< SERVICE INFORMATION >[VQ35DE]
DTC P0643 SENSOR POWER SUPPLY
Diagnosis Procedure
INFOID:0000000001326274
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screw on the body. Refer to EC-144, "
Ground Inspection".
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT-I
TER-
MI-
NAL
NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
48 LG Sensor power supply
(EVAP control system pres-
sure sensor)
[Ignition switch: ON]
Approximately 5V
49 PU Sensor power supply
(Refrigerant pressure sen-
sor) [Ignition switch: ON]
Approximately 5V
68 BR Sensor power supply
(Power steering pressure
sensor) [Ignition switch: ON]
Approximately 5V
82 B/W Sensor ground
(APP sensor 1, ASCD steer-
ing switch, ICC steering
switch) [Engine is running]

Warm-up condition
 Idle speed Approximately 0V
83 G/OR Sensor ground
(APP sensor 2) [Engine is running]

Warm-up condition
 Idle speed Approximately 0V
90 L/B Sensor power supply
(APP sensor 1)
[Ignition switch: ON]
Approximately 5V
91 G Sensor power supply
(APP sensor 2) [Ignition switch: ON]
Approximately 5V
98 Y/R Accelerator pedal position
sensor 2 [Ignition switch: ON]
 Engine stopped
 Accelerator pedal: Fully released
0.15 - 0.60V
[Ignition switch: ON]
 Engine stopped
 Accelerator pedal: Fully depressed 1.95 - 2.40V
106 OR Accelerator pedal position
sensor 1 [Ignition switch: ON]
 Engine stopped
 Accelerator pedal: Fully released
0.5 - 1.0V
[Ignition switch: ON]
 Engine stopped
 Accelerator pedal: Fully depressed 3.9 - 4.7V
PBIB2625E
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DTC P0850 PNP SWITCHEC-429
< SERVICE INFORMATION > [VQ35DE]
C
D
E
F
G H
I
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K L
M A
EC
NP
O
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 P1211 TCS CONTROL UNITEC-435
< SERVICE INFORMATION > [VQ35DE]
C
D
E
F
G H
I
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K L
M A
EC
NP
O
DTC P1211 TCS CONTROL UNIT
DescriptionINFOID:0000000001326283
The malfunction information related to TCS is transferred through the CAN communication line from “ABS
actuator and electric unit (control unit)” to ECM.
Be sure to erase the malfunction
information such as DTC not only fo r “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.
On Board Diagnosis LogicINFOID:0000000001326284
Freeze frame data is not stored in the ECM for this self-diagnosis.
The MIL will not light up for this self-diagnosis.
DTC Confirmation ProcedureINFOID:0000000001326285
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V at idle.
1. Start engine and let it idle for at least 60 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to EC-435, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326286
Go to BRC-34.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1211
1211 TCS control unit
ECM receives a malfunction information from
“ABS actuator and electric unit (Control unit)”.  ABS actuator and electric unit (control
unit)
 TCS related parts
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EC-436
< SERVICE INFORMATION >[VQ35DE]
DTC P1212 TCS COMMUNICATION LINE
DTC P1212 TCS COMMUNICATION LINE
DescriptionINFOID:0000000001326287
NOTE:

If DTC P1212 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-146
.
 If DTC P1212 is displayed with DTC U1010, first pe rform the trouble diagnosis for DTC U1010. Refer
to EC-148
.
This CAN communication line is used to control the smooth engine operation during the TCS operation. Pulse
signals are exchanged between ECM and “ABS act uator and electric unit (control unit)”.
Be sure to erase the malfunction information such as DTC not only for “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.
On Board Diagn osis LogicINFOID:0000000001326288
Freeze frame data is not stored in the ECM for this self-diagnosis.
The MIL will not light up for this self-diagnosis.
DTC Confirmation ProcedureINFOID:0000000001326289
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V at idle.
1. Start engine and let it idle for at least 10 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to EC-436, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326290
Go to BRC-13.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1212
1212 TCS communication line ECM can not receive the information from
“ABS actuator and elec
tric unit (control
unit)”.  Harness or connectors
(CAN communication line is open or shorted.)
 ABS actuator and electric unit (control unit)
 Dead (Weak) battery
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