Infiniti QX56 (Z62). Manual — part 601
EC-382
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0643 SENSOR POWER SUPPLY
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair short to ground or short to power in harness or connectors.
3.
CHECK COMPONENTS
Check the following.
• Camshaft position sensor (bank 2) (Refer to
EC-306, "Component Inspection (Camshaft Position Sensor)"
.)
• Manifold absolute pressure (MAP) sensor (Refer to
EC-208, "Component Inspection (MAP Sensor)"
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace malfunctioning component.
4.
CHECK THROTTLE POSITION SENSOR
EC-220, "Component Inspection (Throttle Position Sensor)"
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 5.
5.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
Replace electric throttle control actuator. Refer to
EM-30, "Removal and Installation"
>> INSPECTION END
6.
CHECK ACCELERATOR PEDAL POSITION SENSOR
EC-470, "Component Inspection (Accelerator Pedal Position Sensor)"
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 7.
7.
REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly. Refer to
ACC-3, "MODELS WITHOUT DISTANCE CONTROL ASSIST
SYSTEM : Removal and Installation"
(Without distance control assist system) or
DISTANCE CONTROL ASSIST SYSTEM : Removal and Installation"
(With distance control assist system).
>> INSPECTION END
8.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
>> INSPECTION END
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F111
81
Electric throttle control actuator
F66
2
83
Camshaft position sensor (bank 2)
F83
1
85
Manifold absolute pressure (MAP) sensor
F65
1
E80
137
APP sensor 1 (Without ICC)
E110
2
137
APP sensor 1 (With ICC)
E67
12
P0850 PNP SWITCH
EC-383
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
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F
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EC
N
P
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P0850 PNP SWITCH
Description
INFOID:0000000006217884
When the selector lever position is P or N, park/neutral position (PNP) signal is sent to ECM from TCM.
DTC Logic
INFOID:0000000006217885
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
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
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0850
P-N POS SW/CIRCUIT
(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
EC-384
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0850 PNP SWITCH
4.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
5.
PERFORM COMPONENT FUNCTION CHECK
WITH GST
Perform Component Function Check. Refer to
EC-384, "Component Function Check"
NOTE:
Use Component Function Check to check the overall function of the park/neutral position (PNP) signal circuit.
During this check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000006217886
1.
PERFORM COMPONENT FUNCTION CHECK
WITH GST
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000006217887
1.
CHECK DTC WITH TCM
TM-61, "CONSULT-III Function (TRANSMISSION)"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace malfunctioning part.
2.
CHECK STARTING SYSTEM
Turn ignition switch OFF, then turn it to START.
Does starter motor operate?
YES
>> GO TO 3.
NO
>> Check DTC with BCM. Refer to
.
3.
CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect A/T assembly harness connector.
3.
Disconnect ECM harness connector.
4.
Check the continuity between A/T assembly harness connector and ECM harness connector.
VHCL SPEED SE
More than 64 km/h (40 mph)
Selector lever
Suitable position
ECM
Condition
Voltage (V)
Connector
+
–
Terminal
Terminal
F111
11
175
Selector lever
P or N position
Battery voltage
Except above position
Approx. 0
P0850 PNP SWITCH
EC-385
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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EC
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5.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between A/T assembly and ECM
• Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
A/T assembly
ECM
Continuity
Connector
Terminal
Connector
Terminal
F301
9
F111
11
Existed
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