Nissan Titan. Instruction — part 295

REFRIGERANT PRESSURE SENSOR

EC-481

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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REFRIGERANT PRESSURE SENSOR

Component Description

INFOID:0000000009886930

The refrigerant pressure sensor is installed at the condenser of the

air conditioner system. The sensor uses an electrostatic volume

pressure transducer to convert refrigerant pressure to voltage. The

voltage signal is sent to ECM.

Diagnosis Procedure

INFOID:0000000009886931

1.

CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION

1. Start engine and warm it up to normal operating temperature.

2. Turn A/C switch and blower fan switch ON.

3. Check voltage between ECM terminal 70 and ground with CON-

SULT or tester.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK GROUND CONNECTIONS

1. Turn A/C switch and blower fan switch OFF.

2. Turn ignition switch OFF.

3. Loosen and retighten three ground screws on the body.

BBIA0356E

PBIB2657E

Voltage: 1.0 - 4.0V

PBIB1188E

EC-482

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[VK56DE]

REFRIGERANT PRESSURE SENSOR

Refer to

EC-154, "Ground Inspection"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace ground connections.

3.

CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

1. Disconnect refrigerant pressure sensor harness connector.

2. Turn ignition switch ON.

3. Check voltage between refrigerant pressure sensor terminal 1

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 3 and ECM terminal 67.

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.

BBIA0354E

BBIA0356E

Voltage: Approximately 5V

PBIB0188E

Continuity should exist.

REFRIGERANT PRESSURE SENSOR

EC-483

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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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 or 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 70 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

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 or short to ground or short to power in harness or connectors.

9.

CHECK INTERMITTENT INCIDENT

Refer to

GI-39, "How to Check Terminal"

and

GI-42, "Intermittent Incident"

.

OK or NG

OK

>> Replace refrigerant pressure sensor.

NG

>> Repair or replace.

Continuity should exist.

EC-484

< SYMPTOM DIAGNOSIS >

[VK56DE]

ENGINE CONTROL SYSTEM SYMPTOMS

SYMPTOM DIAGNOSIS

ENGINE CONTROL SYSTEM SYMPTOMS

Symptom Matrix Chart

INFOID:0000000009886932

SYSTEM — BASIC ENGINE CONTROL SYSTEM

SYMPTOM

Refer-
ence page

HARD/NO ST

AR

T

/REST

AR

T

(EXCP

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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

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Fuel pump circuit

1

1

2

3

2

2

2

3

2

EC-381

,

EC-462

Fuel pressure regulator system

3

3

4

4

4

4

4

4

4

4

EC-489

Fuel injector circuit

1

1

2

3

2

2

2

2

EC-459

Evaporative emission system

3

3

4

4

4

4

4

4

4

4

EC-31

Air

Positive crankcase ventilation sys-
tem

3

3

4

4

4

4

4

4

4

4

1

EC-479

Incorrect idle speed adjustment

1

1

1

1

1

EC-117

Electric throttle control actuator

1

1

2

3

3

2

2

2

2

2

2

EC-426

,

EC-429

,

EC-433

,

EC-435

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-469

Main power supply and ground circuit

2

2

3

3

3

3

3

2

3

EC-151