Infiniti FX35 / FX45. Manual - part 417

DTC P0850 PNP SWITCH

EC-429

< SERVICE INFORMATION >

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DTC P0850 PNP SWITCH

Component Description

INFOID:0000000001326275

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-III Reference Value in Data Monitor Mode

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Specification data are reference values.

On Board Diagnosis Logic

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DTC Confirmation Procedure

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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-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.

If NG, go to 

EC-432, "Diagnosis Procedure"

.

If OK, go to following steps.

3.

Select “DATA MONITOR” mode with CONSULT-III.

4.

Start engine and warm it up to normal operating temperature.

5.

Maintain the following conditions for at least 60 consecutive seconds.

6.

Check 1st trip DTC,

7.

If 1st trip DTC is detected, go to 

EC-432, "Diagnosis 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 circuit 
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

EC-430

< SERVICE INFORMATION >

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DTC P0850 PNP SWITCH

Overall Function Check

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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-432, "Diagnosis Procedure"

.

Condition (Selector lever)

Voltage V (Known-good data)

P or N position

Approx. 0

Except above position

BATTERY VOLTAGE

(11 - 14V)

MBIB0043E

DTC P0850 PNP SWITCH

EC-431

< SERVICE INFORMATION >

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Wiring Diagram

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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.

TBWM0521E

EC-432

< SERVICE INFORMATION >

[VQ35DE]

DTC P0850 PNP SWITCH

Diagnosis Procedure

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1.

CHECK DTC WITH TCM

Refer to 

AT-38, "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?

Yes or No

Yes

>> GO TO 3.

No

>> Refer to 

SC-8

.

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.

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

TER-

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NAL 

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.

Continuity should exist.