INFINITI FX35 2007 Service Manual

DTC P0643 SENSOR POWER SUPPLY EC-485
[VQ35DE]
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Revision: 2006 July 2007 FX35/FX45
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL 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

EC-486
[VQ35DE]
DTC P0643 SENSOR POWER SUPPLY
Revision: 2006 July 2007 FX35/FX45
Diagnostic ProcedureNBS003V2
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screw on the body. Refer to EC-153, "
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
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
3. Check voltage between APP sensor terminal 6 and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 3.
PBIB2625E
PBIB1580E
Voltage: Approximately 5V
PBIB0914E

DTC P0643 SENSOR POWER SUPPLY EC-487
[VQ35DE]
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Revision: 2006 July 2007 FX35/FX45
3. CHECK SENSOR POWER SUPPLY CIRCUITS
Check harness for short to power and short to ground, between the following terminals.
OK or NG
OK >> GO TO 6.
NG >> Repair short to ground or short to power in harness or connectors.
4. CHECK COMPONENTS
Check the following.

Refrigerant pressure sensor (Refer to AT C - 8 9 , "COMPONENT INSPECTION" .)

Power steering pressure sensor (Refer to EC-475, "Component Inspection" .)

EVAP control system pressure sensor (Refer to EC-426, "Component Inspection" .)
OK or NG
OK >> GO TO 9.
NG >> Replace malfunctioning component.
5. CHECK ACCELERATOR PEDAL POSITION SENSOR
Refer to EC-582, "
Component Inspection" .
OK or NG
OK >> GO TO 9.
NG >> GO TO 8.
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform EC-83, "
Accelerator Pedal Released Position Learning" .
3. Perform EC-83, "
Throttle Valve Closed Position Learning" .
4. Perform EC-83, "
Idle Air Volume Learning" .
>> INSPECTION END
7. CHECK INTERMITTENT INCIDENT
Refer to EC-147, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
ECM terminal Sensor terminal Reference Wiring Diagram
90 APP sensor terminal 6 EC-578
49 Refrigerant pressure sensor terminal 1EC-664
68 PSP sensor terminal 1EC-472
48 EVAP control system pressure sensor terminal 3EC-429

EC-488
[VQ35DE]
DTC P0850 PNP SWITCH
Revision: 2006 July 2007 FX35/FX45
DTC P0850 PNP SWITCHPFP:23006
Component DescriptionNBS003XZ
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-II Reference Value in Data Monitor ModeNBS003Y0
Specification data are reference values.
On Board Diagnosis LogicNBS003Y1
DTC Confirmation ProcedureNBS003Y2
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “P/N POSI SW” in “DATA MONITOR” mode with CON- SULT-II. Then check the “P/N POSI SW” signal under the follow-
ing conditions.
If NG, go to EC-491, "
Diagnostic Procedure" .
If OK, go to following steps.
3. Select “DATA MONITOR” mode with CONSULT-II.
4. Start engine and warm it up to normal operating temperature.
5. Maintain the following conditions for at least 60 consecutive sec- onds.
6. If 1st trip DTC is detected, go to EC-491, "
Diagnostic 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 cir-
cuit 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 than 64 km/h (40 MPH)
Selector lever Suitable position
SEF212Y
SEF213Y

DTC P0850 PNP SWITCH EC-489
[VQ35DE]
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Revision: 2006 July 2007 FX35/FX45
Overall Function CheckNBS003Y3
Use this procedure to check the overall function of the park/neutral position (PNP) switch circuit. During this
check, a 1st trip DTC might not be confirmed.
WITH GST
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 102 (PNP switch signal) and ground under the following conditions.
3. If NG, go to EC-491, "
Diagnostic Procedure" .
Condition (Selector lever) Voltage V (Known-good data)
P or N position Approx. 0
Except above position BATTERY VOLTAGE
(11 - 14V)
MBIB0043E

EC-490
[VQ35DE]
DTC P0850 PNP SWITCH
Revision: 2006 July 2007 FX35/FX45
Wiring DiagramNBS003Y4
TBWM0521E

DTC P0850 PNP SWITCH EC-491
[VQ35DE]
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Revision: 2006 July 2007 FX35/FX45
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic ProcedureNBS003Y5
1. CHECK DTC WITH TCM
Refer to AT- 4 0 , "
OBD-II Diagnostic Trouble Code (DTC)" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace.
2. CHECK STARTING SYSTEM
Turn ignition switch OFF, then turn it to START.
Does starter motor operate?
Ye s o r N o
Ye s > > G O T O 3 .
No >> Refer to SC-11, "
STARTING SYSTEM" .
3. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I
1. Turn ignition switch OFF.
2. Disconnect A/T assembly harness connector.
3. Disconnect “unified meter and A/C amp.” harness connector.
4. Check harness continuity between A/T assembly terminal 9 and “unified meter and A/C amp.” terminal 32. Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors F102, M82

Harness for open or short between A/T assembly and “unified meter and A/C amp.”.
>> Repair open circuit or short to ground or short to power in harness or connectors.
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
102 LG/B PNP switch [Ignition switch: ON]

Selector lever: P or N
Approximately 0V
[Ignition switch: ON]

Except above position BATTERY VOLTAGE
(11 - 14V)
Continuity should exist.

EC-492
[VQ35DE]
DTC P0850 PNP SWITCH
Revision: 2006 July 2007 FX35/FX45
5. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 102 and “unified meter and A/C amp.” terminal 25. Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-III
1. Disconnect TCM harness connector.
2. Check harness continuity between A/T assembly terminal 9 and TCM terminal 8. Refer to AT- 1 0 7 , "
DTC P0615 START SIGNAL CIRCUIT" .
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK INTERMITTENT INCIDENT
Refer to EC-812, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace.
8. REPLACE “UNIFIED METER AND A/C AMP.”
Refer to DI-28, "
UNIFIED METER AND A/C AMP" .
>> INSPECTION END
Continuity should exist.
Continuity should exist.

DTC P1148, P1168 CLOSED LOOP CONTROL EC-493
[VQ35DE]
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Revision: 2006 July 2007 FX35/FX45
DTC P1148, P1168 CLOSED LOOP CONTROLPFP:22690
On Board Diagnosis LogicNBS003U8
These self-diagnoses have the one trip detection logic.
NOTE:
DTC P1148 or P1168 is displayed with another DTC for air fuel ratio (A/F) sensor 1.
Perform the trouble diagnosis for the corresponding DTC.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1148
11 4 8
(Bank 1) Closed loop control
function The closed loop control function for bank 1
does not operate even when vehicle is driving
in the specified condition.

Harness or connectors
[Air fuel ratio (A/F) sensor 1 circuit is
open or shorted.]

Air fuel ratio (A/F) sensor 1

Air fuel ratio (A/F) sensor 1 heater
P1168
11 6 8
(Bank 2) The closed loop control function for bank 2
does not operate even when vehicle is driving
in the specified condition.

EC-494
[VQ35DE]
DTC P1211 TCS CONTROL UNIT
Revision: 2006 July 2007 FX35/FX45
DTC P1211 TCS CONTROL UNITPFP:47850
DescriptionNBS003U9
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 for “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.
On Board Diagnosis LogicNBS003UA
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 ProcedureNBS003UB
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V at idle.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for at least 60 seconds.
4. If 1st trip DTC is detected, go to EC-494, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureNBS003UC
Go to BRC-36, "TROUBLE DIAGNOSIS FOR SYSTEM" .
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
SEF058Y