Infiniti M35/M45 Y50. Manual - part 505

DTC P0850 PNP SWITCH

EC-493

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

NBS0052R

TBWT0985E

EC-494

[VQ35DE]

DTC P0850 PNP SWITCH

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.

Diagnostic Procedure

NBS0052S

1. 

CHECK DTC WITH TCM

Refer to 

AT-40, "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, "STARTING SYSTEM"

 .

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 2.
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 M72, F102

●

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.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

102

G

PNP switch

[Ignition switch: ON]

●

Selector lever: P or N

Approximately 0V

[Ignition switch: ON]

●

Selector lever: Except above

BATTERY VOLTAGE
(11 - 14V)

Continuity should exist.

DTC P0850 PNP SWITCH

EC-495

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

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 21.
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

1.

Check harness continuity between A/T assembly terminal 9 and TCM terminal 8.
Refer to 

AT-108, "DTC P0615 START SIGNAL CIRCUIT"

 .

2.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 7.

NG

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

7. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-153, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace.

8. 

REPLACE “UNIFIED METER AND A/C AMP.”

Refer to 

DI-28, "UNIFIED METER AND A/C AMP"

 .

>> INSPECTION END

Continuity should exist.

Continuity should exist.

EC-496

[VQ35DE]

DTC P1148, P1168 CLOSED LOOP CONTROL

DTC P1148, P1168 CLOSED LOOP CONTROL

PFP:22690

On Board Diagnosis Logic

NBS0052T

These self-diagnoses have the one trip detection logic.

NOTE:
DTC P1148 or P1168 is displayed with another DTC for A/F sensor 1.
Perform the trouble diagnosis for the corresponding DTC.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1148
1148
(Bank 1)

Closed loop control 
function

The closed loop control function for bank 1 
does not operate even when vehicle is driving 
in the specified condition.

●

Harness or connectors
(The A/F sensor 1 circuit is open or 
shorted.)

●

A/F sensor 1

●

A/F sensor 1 heater

P1168
1168
(Bank 2)

The closed loop control function for bank 2 
does not operate even when vehicle is driving 
in the specified condition.