Infiniti Q45. Manual — part 464
DTC P0643 SENSOR POWER SUPPLY
EC-495
C
D
E
F
G
H
I
J
K
L
M
A
EC
Diagnostic Procedure
NBS0022J
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
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 voltage between APP sensor terminal 6 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
PBIB2417E
Voltage: Approximately 5V
PBIB2432E
PBIB0914E
EC-496
DTC P0643 SENSOR POWER SUPPLY
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 4.
NG
>> Repair short to ground or short to power in harness or connectors.
4.
CHECK COMPONENTS
Check the following.
●
EVAP control pressure sensor (Refer to
EC-442, "Component Inspection"
●
Refrigerant pressure sensor (Refer to
ATC-92, "COMPONENT INSPECTION"
●
Power steering pressure sensor (Refer to
EC-484, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace malfunctioning component.
5.
CHECK APP SENSOR
Refer to
EC-652, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace accelerator pedal assembly.
2.
Perform
EC-77, "Accelerator Pedal Released Position Learning"
.
3.
Perform
EC-78, "Throttle Valve Closed Position Learning"
4.
Perform
EC-78, "Idle Air Volume Learning"
>> INSPECTION END
7.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
ECM terminal
Sensor terminal
Reference Wiring Diagram
90
APP sensor terminal 6
48
EVAP control pressure sensor terminal 1
49
Refrigerant pressure sensor terminal 1
68
PSP sensor terminal 1
DTC P0850 PNP SWITCH
EC-497
C
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EC
DTC P0850 PNP SWITCH
PFP:23006
Component Description
NBS0024Y
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 Mode
NBS0024Z
Specification data are reference values.
On Board Diagnosis Logic
NBS00250
DTC Confirmation Procedure
NBS00251
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.
EC-500, "Diagnostic Procedure"
If OK, go to following step.
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-500, "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
[The park/neutral position (PNP) switch
circuit is open or shorted.]
●
Park/neutral position (PNP) switch
●
TCM
Position (Selector lever)
Known-good signal
N or P position
ON
Except above position
OFF
ENG SPEED
More than 1,200 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
EC-498
DTC P0850 PNP SWITCH
Overall Function Check
NBS00252
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-500, "Diagnostic Procedure"
Position (Selector lever)
Voltage (Known good data)
P or N position
Approx. 0V
Except above position
BATTERY VOLTAGE (11 - 14V)
MBIB0043E
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