Infiniti FX35, FX50 (S51). Manual — part 856
P0643 SENSOR POWER SUPPLY
EC-965
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
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EC
N
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P0643 SENSOR POWER SUPPLY
DTC Logic
INFOID:0000000005237438
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and let it idle for 1 second.
2.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237439
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection M95. Refer to Ground Inspection in
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT
1.
Disconnect accelerator pedal position (APP) sensor harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between APP sensor harness connector and ground.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0643
Sensor power supply
circuit short
ECM detects that the voltage
of power source for sensor is
excessively low or high.
• Harness or connectors
(Accelerator pedal position sensor 1 circuit is shorted.)
[Camshaft position sensor (bank 2) circuit is shorted.]
[Exhaust valve timing control position sensor (bank 2) circuit
is shorted.]
(Power steering pressure sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is shorted.)
(Throttle position sensor circuit is shorted.)
• Accelerator pedal position sensor
• Camshaft position sensor (bank 2)
• Exhaust valve timing control position sensor (bank 2)
• Power steering pressure sensor
• Refrigerant pressure sensor
• Throttle position sensor
EC-966
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
P0643 SENSOR POWER SUPPLY
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 3.
3.
CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair short to ground or short to power in harness or connectors.
4.
CHECK COMPONENTS
Check the following.
• Camshaft position sensor (bank 2) (Refer to
EC-881, "Component Inspection"
• Exhaust valve timing control position sensor (bank 2) (Refer to
EC-978, "Component Inspection"
.)
• Power steering pressure sensor (Refer to
EC-958, "Component Inspection"
• Refrigerant pressure sensor (Refer to
EC-1127, "Diagnosis Procedure"
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace malfunctioning component.
5.
CHECK THROTTLE POSITION SENSOR
EC-1017, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 6.
6.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1.
Replace electric throttle control actuator.
2.
Go to
EC-1017, "Special Repair Requirement"
>> INSPECTION END
7.
CHECK ACCELERATOR PEDAL POSITION SENSOR
EC-1076, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
APP sensor
Ground
Voltage (V)
Connector
Terminal
E112 (Without ICC)
5
Ground
Approx. 5
E116 (With ICC)
5
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F111
84
Electric throttle control actuator (bank 1)
F66
2
88
Camshaft position sensor (bank 2)
F83
1
88
EVT control position sensor (bank 2)
F63
1
92
Power steering pressure sensor
F35
3
92
Refrigerant pressure sensor
E77
3
M160
96
Electric throttle control actuator (bank 2)
F64
2
99
APP sensor (Without ICC)
E112
5
99
APP sensor (With ICC)
E116
5
P0643 SENSOR POWER SUPPLY
EC-967
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
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EC
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8.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace accelerator pedal assembly.
2.
Go to
EC-1077, "Special Repair Requirement"
>> INSPECTION END
9.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
>> INSPECTION END
EC-968
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
P0850 PNP SWITCH
P0850 PNP SWITCH
Description
INFOID:0000000005237440
When the selector lever position is P or N, park/neutral position (PNP) signal is sent to ECM from TCM.
DTC Logic
INFOID:0000000005237441
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
INSPECTION START
Will CONSULT-III be used?
Will CONSULT-III be used?
YES
>> GO TO 2.
NO
>> GO TO 5.
2.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 3.
3.
CHECK PNP SIGNAL
With CONSULT-III
1.
Turn ignition switch ON.
2.
Select “P/N POSI SW” in “DATA MONITOR” mode with CONSULT-III. Then check the “P/N POSI SW” sig-
nal under the following conditions.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Go to
4.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Select “DATA MONITOR” mode with CONSULT-III.
2.
Start engine and warm it up to normal operating temperature.
3.
Maintain the following conditions for at least 50 consecutive seconds.
CAUTION:
Always drive vehicle at a safe speed.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0850
Park/neutral position
switch
The signal of the park/neutral position (PNP)
signal does not change during driving after the
engine is started.
• Harness or connectors
[The park/neutral position (PNP) signal
circuit is open or shorted.]
• TCM
Position (Selector lever)
Known-good signal
N or P position
ON
Except above position
OFF
ENG SPEED
1,300 - 6,375 rpm
COOLAN TEMP/S
More than 70
°
C (158
°
F)
B/FUEL SCHDL
2.0 - 31.8 msec
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