Nissan Frontier. Manual - part 472

REFRIGERANT PRESSURE SENSOR

EC-459

< DTC/CIRCUIT DIAGNOSIS >

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1. Disconnect refrigerant pressure sensor harness connector.

2. Turn ignition switch ON.

3. Check voltage between refrigerant pressure sensor terminal 3

and ground with CONSULT or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• Harness for open or short between ECM and refrigerant pressure sensor

>> Repair harness or connectors.

5.

CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between refrigerant pressure sensor terminal 1 and ECM terminal 40.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• Harness for open or short between ECM and refrigerant pressure sensor

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

7.

CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between ECM terminal 39 and refrigerant pressure sensor terminal 2.

Refer to Wiring Diagram.

2. Also check harness for short to ground and short to power.
OK or NG

BBIA0627E

Voltage: Approximately 5V

PBIB1872E

Continuity should exist.

Continuity should exist.

EC-460

< DTC/CIRCUIT DIAGNOSIS >

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REFRIGERANT PRESSURE SENSOR

OK

>> GO TO 9.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• Harness for open or short between ECM and refrigerant pressure sensor

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

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

OK or NG

OK

>> Replace refrigerant pressure sensor. Refer to 

HA-36, "Removal and Installation"

.

NG

>> Repair or replace. 

ENGINE CONTROL SYSTEM SYMPTOMS

EC-461

< SYMPTOM DIAGNOSIS >

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SYMPTOM DIAGNOSIS

ENGINE CONTROL SYSTEM SYMPTOMS

Symptom Matrix Chart

INFOID:0000000009481165

SYSTEM — BASIC ENGINE CONTROL SYSTEM

SYMPTOM

Reference 
page

HARD/NO ST

AR

T

/REST

AR

T

 (EXCP

. 

H

A

)

ENGINE ST

ALL

HESIT

A

TION/SURGING/FLA

T

 SPOT

SP

ARK KNOCK/DET

O

NA

TION

LACK

 OF POWER/

POOR 

ACC

E

LERA

TION

HIGH IDL

E/LOW

 IDLE

ROUG

H IDLE/HUNTING

IDLI

NG VIBRA

TION

SLOW

/NO RETURN T

O

 IDLE

OVERHEA

T

S/W

A

TER TEMPERA

T

UR

E

 HIGH

EXCESS

IVE F

U

E

L CONSUMP

T

IO

N

EXCESS

IVE OIL CONSUMP

T

ION

BA

TTER

Y

 DEAD (UNDER CHARGE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG AH

AJ

AK

AL

AM HA

Fuel

Fuel  pump  circuit

1

1

2

3

2

2

2

3

2

EC-439

Fuel  pressure  regulator  system

3

3

4

4

4

4

4

4

4

4

EC-466

Fuel  injector  circuit

1

1

2

3

2

2

2

2

EC-439

Evaporative  emission  system

3

3

4

4

4

4

4

4

4

4

EC-41

Air

Positive crankcase ventilation sys-
tem

3

3

4

4

4

4

4

4

4

4

1

EC-456

Incorrect  idle  speed  adjustment

3

3

1

1

1

1

1

EC-117

Electric  throttle  control  actuator

1

1

2

3

3

2

2

2

2

2

2

EC-194

, 

EC-407

, 

EC-410

, 

EC-414

Ignition Incorrect  ignition  timing  adjustment

3

3

1

1

1

1

1

1

EC-117

Ignition  circuit

1

1

2

2

2

2

2

2

EC-446

Power  supply  and  ground  circuit

2

2

3

3

3

3

3

2

3

EC-446

Mass  air  flow  sensor  circuit

1

1

2

2

2

2

2

2

EC-164

, 

EC-168

Engine  coolant  temperature  sensor  circuit

1

1

2

2

2

3

2

2

3

1

2

EC-181

, 

EC-188

Throttle  position  sensor  circuit

1

2

2

2

2

2

2

2

EC-407

, 

EC-410

, 

EC-414

, 

EC-416

, 

EC-425

Accelerator  pedal  position  sensor  circuit

3

2

1

2

2

EC-418

, 

EC-421

, 

EC-429

EC-462

< SYMPTOM DIAGNOSIS >

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ENGINE CONTROL SYSTEM SYMPTOMS

1 - 6: The numbers refer to the order of inspection.
(continued on next page)

SYSTEM — ENGINE MECHANICAL & OTHER

 

Air  fuel  ratio  (A/F)  sensor  1  circuit

1

2

3

2

2

2

2

EC-197

, 

EC-201

, 

EC-204

, 

EC-223

, 

EC-402

Knock sensor circuit

2

2

3

EC-258

Crankshaft position sensor (POS) circuit

2

2

EC-258

Camshaft position sensor (PHASE) circuit

2

2

EC-262

Vehicle speed signal circuit

2

3

3

3

EC-333

Power  steering  pressure  sensor  circuit

3

3

3

3

EC-342

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-345

, 

EC-347

Intake valve timing control solenoid valve cir-
cuit

3

3

2

1

3

2

2

3

3

EC-152

Park/neutral  position  (PNP)  signal  circuit

3

3

3

3

3

3

3

EC-353

Refrigerant  pressure  sensor  circuit

2

3

3

3

3

4

EC-458

Electrical  load  signal  circuit

3

3

3

3

EC-438

Air  conditioner  circuit

2

2

3

3

3

3

3

3

3

3

2

HAC-142
HAC-208

SYMPTOM

Reference 
page

HARD/NO S

TA

R

T/RES

TA

R

T (E

XCP

. HA)

E

N

GINE

 ST

ALL

HES

IT

A

TION/SURGING/FLA

T

 SPOT

S

P

ARK KNOC

K

/DET

O

NA

TI

ON

LACK OF 

POWER/POOR ACCELERA

TION

HIG

H

 IDL

E

/L

OW

 ID

LE

ROUGH IDLE/HUNTING

ID

LING VI

BRA

T

ION

S

LOW/NO RETU

RN 

T

O ID

LE

OVERHEA

T

S

/W

A

TER TEMPERA

T

URE HIG

H

E

XCESSIVE

 FUEL CON

S

UMP

T

ION

E

XCESSIVE

 OIL 

C

O

NSUMP

T

ION

B

A

TTER

Y 

DEAD (UNDER CHARGE)

Warranty symptom code

AA

AB

AC AD

AE

AF

AG AH

AJ

AK

AL

AM HA