Nissan Frontier. Manual — part 445

P0643 SENSOR POWER SUPPLY

EC-351

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK APP 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 2 and ground with

CONSULT or tester.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 3.

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.

• Battery current sensor (Refer to

EC-374, "Component Inspection"

.)

• Camshaft position sensor (Refer to

EC-265, "Component Inspection"

.)

• Power steering pressure sensor (Refer to

EC-344, "Component Inspection"

.)

• Throttle position sensor (Refer to

EC-187, "Component Inspection"

.)

OK or NG

OK

>> GO TO 5.

NG

>> Replace malfunctioning component.

5.

CHECK APP SENSOR

Refer to

EC-424, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

BBIA0592E

Voltage: Approximately 5V

PBIB2608E

ECM terminal

Sensor terminal

47

Throttle position sensor terminal 2

51

Battery current sensor terminal 1

55

Power steering pressure sensor terminal 3

59

Camshaft position sensor terminal 1

83

Accelerator pedal position sensor terminal 2

EC-352

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0643 SENSOR POWER SUPPLY

NG

>> GO TO 6.

6.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly. Refer to

ACC-3, "Removal and Installation"

.

2. Perform

EC-123, "Accelerator Pedal Released Position Learning"

.

3. Perform

EC-123, "Throttle Valve Closed Position Learning"

.

4. Perform

EC-124, "Idle Air Volume Learning"

.

>> INSPECTION END

7.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

.

>> INSPECTION END

P0850 PNP SWITCH

EC-353

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0850 PNP SWITCH

Component Description

INFOID:0000000009481035

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

When the selector lever position is P or N, park/neutral position (PNP) signal is sent to ECM from TCM via

combination meter (unified meter control unit). (A/T)

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

On Board Diagnosis Logic

INFOID:0000000009481036

DTC Confirmation Procedure

INFOID:0000000009481037

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

1. Turn ignition switch ON.
2. Select “P/N POSI SW” in “DATA MONITOR” mode with CONSULT. Then check the “P/N POSI SW” signal

under the following conditions.

If NG, go to

EC-354, "Diagnosis Procedure"

.

If OK, go to following step.

3. Select “DATA MONITOR” mode with CONSULT.
4. Start engine and warm it up to normal operating temperature.
5. Maintain the following conditions for at least 50 consecutive seconds.

6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to

EC-354, "Diagnosis Procedure"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0850
0850

Park/neutral position
switch

The signal of the park/neutral position (PNP)
does not change during driving after the engine
is started.

• Harness or connectors

[The park/neutral position (PNP) signal
circuit is open or shorted.]

• Park/neutral position (PNP) switch (M/T)
• Transmission range switch (A/T)
• Combination meter
• TCM (A/T)

Position (Shift lever)

Known-good signal

A/T: P or N position
M/T: Neutral position

ON

Except the above position

OFF

ENG SPEED

A/T: More than 1,150 rpm
M/T: More than 1,400 rpm

COOLAN TEMP/S

A/T: More than 70

°C (158°F)

M/T: More than 68

°C (155°F)

B/FUEL SCHDL

2.0 - 31.8 msec

VHCL SPEED SE

More than 64 km/h (40 MPH)

Shift lever

Suitable position

EC-354

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0850 PNP SWITCH

Overall Function Check

INFOID:0000000009481038

Use this procedure to check the overall function of the park/neutral position (PNP) signal 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 101 (PNP signal) and ground under the following conditions.

3. If NG, go to

EC-354, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481039

A/T MODELS

1.

CHECK DTC WITH TCM

Refer to

TM-231, "DTC No. Index"

.

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

STR-6, "Work Flow (With GR8-1200 NI)"

or

STR-10, "Work Flow (Without GR8-1200

NI)"

.

3.

CHECK PNP INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I

1. Turn ignition switch OFF.

2. Disconnect A/T assembly harness connector.

3. Disconnect combination meter harness connector.

4. Check harness continuity between A/T assembly terminal 9 and combination meter terminal 17.

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 M31, E152

• Harness for open or short between A/T assembly and combination meter.

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

5.

CHECK PNP INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II

1. Disconnect ECM harness connector.

2. Check harness continuity between ECM terminal 101 and combination meter terminal 7.

Condition (shift position)

Voltage (Known-good data)

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

Approx. 0 (V)

Except the above position

BATTERY VOLTAGE

(11 - 14V)

Continuity should exist.