Nissan Altima L32. Manual - part 437

P0643 SENSOR POWER SUPPLY

EC-869

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2. Go to 

EC-926, "Special Repair Requirement"

.

>> INSPECTION END

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

EC-870

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

P0850 PNP SWITCH

P0850 PNP SWITCH

Description

INFOID:0000000004349836

When the shift lever position is P or N (CVT), Neutral position (M/T), park/neutral position (PNP) switch is ON.

ECM detects the position because the continuity of the line (the ON signal) exists.

DTC Logic

INFOID:0000000004349837

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Do you have CONSULT-III?
Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 5.

2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

>> GO TO 3.

3.

CHECK PNP SWITCH FUNCTION

 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 

EC-871, "Diagnosis Procedure"

.

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) 
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

Position (Shift lever)

Known-good signal

N or P position (CVT)
Neutral position (M/T)

ON

Except above position

OFF

ENG SPEED

CVT: 1,300 - 6,375 rpm
M/T: 1,500 - 6,375 rpm

COOLAN TEMP/S

More than 70

°C (158°F)

P0850 PNP SWITCH

EC-871

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-871, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-871, "Component Function Check"

.

NOTE:

Use component function check the overall function of the park/neutral position (PNP) switch circuit. During this

check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-871, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000004349838

1.

PERFORM COMPONENT FUNCTION CHECK

1. Turn ignition switch ON.

2. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-871, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349839

1.

CHECK PNP SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect Park/neutral position (PNP) switch harness connector.

3. Turn ignition switch ON.

4. Check the voltage between PNP switch harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair open circuit or short to ground or short to power

in harness or connectors.

2.

CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I

B/FUEL SCHDL

CVT: 3.0 - 31.8 msec
M/T: 2.1 - 31.8 msec

VHCL SPEED SE

More than 64 km/h (40 mph)

Shift lever

Suitable position

ECM

Ground

Condition

Voltage

Connector

Terminal

E10

102

(PNP switch 

signal)

Ground

Shift lever

P or N (CVT)
Neutral (M/T)

Approx. 0V

Except 
above

Battery voltage

JMBIA1600ZZ

PNP switch

Ground

Voltage

Connector

Terminal

F25 (CVT) (A)

F32 (M/T) (B)

1

Ground

Battery voltage

JMBIA1601ZZ

EC-872

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

P0850 PNP SWITCH

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between PNP switch harness connector and ECM harness connector.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 4.

NO-1 >> Repair open circuit or short to ground or short to power in harness or connectors.

NO-2 >> CVT: GO TO 3.

3.

CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II

1. Check the continuity between PNP switch harness connector and ECM harness connector.

2. Check the continuity between IPDM E/R harness connector and ECM harness connector.

3. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK PNP SWITCH

Refer to 

TM-308, "Component Inspection (Park/Neutral Position Switch)"

 (CVT) or 

TM-20, "Inspection"

 (M/T).

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace PNP switch.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

PNP switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

F25 (CVT)

F32 (M/T)

2

E10

102

Existed

PNP switch

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F25

2

F10

72

Existed

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F10

102

E18

30

Existed