Nissan Frontier D40. Manual - part 426

REFRIGERANT PRESSURE SENSOR

EC-395

< COMPONENT DIAGNOSIS >

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EC

N

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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 3
and ground with CONSULT-III 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 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.

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 70 and refrigerant pressure sensor terminal 2.
Refer to Wiring Diagram.

BBIA0627E

Voltage: Approximately 5V

PBIB1872E

Continuity should exist.

EC-396

< COMPONENT DIAGNOSIS >

[QR25DE]

REFRIGERANT PRESSURE SENSOR

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

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

OK or NG

OK

>> Replace refrigerant pressure sensor.

NG

>> Repair or replace. 

Continuity should exist.

ECM

EC-397

< ECU DIAGNOSIS >

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ECU DIAGNOSIS

ECM

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000005273431

Remarks:

z

 Specification data are reference values.

z

 Specification data are output/input values which are detected or supplied by the ECM at the connector.

* Specification data may not be directly related to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show the specification data in spite of the

ignition timing not being adjusted to the specification data. This IGN TIMING monitors the data calculated by the ECM according to the signals
input from the camshaft position sensor and other ignition timing related sensors.

MONITOR ITEM

CONDITION

SPECIFICATION

ENG SPEED

• Run engine and compare the CONSULT-III value with tachometer indication.

Almost the same speed as 
the tachometer indication.

MAS A/F SE-B1

• See 

EC-79

.

B/FUEL SCHDL

• See 

EC-79

.

A/F ALPHA-B1

• See 

EC-79

.

COOLAN TEMP/S

• Engine: After warming up

More than 70

°

C (158

°

F)

A/F SEN1 (B1)

• Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

HO2S2 (B1)

• Revving engine from idle to 3,000 rpm quickly after the following conditions are 

met.

- Engine: After warming up
- Keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 

1 minute under no load.

0 - 0.3V 

←→

 Approx. 0.6 - 

1.0V

HO2S2 MNTR (B1) 

• Revving engine from idle to 3,000 rpm quickly after the following conditions are 

met.

- Engine: After warming up
- Keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 

1 minute under no load.

LEAN 

←→

 RICH

VHCL SPEED SE

• Turn drive wheels and compare the CONSULT-III value with speedometer indica-

tion.

Almost the same speed as 
the speedometer indica-
tion.

BATTERY VOLT

• Ignition switch: ON (Engine stopped)

11 - 14V

ACCEL SEN 1

ACCEL SEN 2*

1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.6 - 0.95V

Accelerator pedal: Fully depressed

Less than 4.75V

TP SEN 1-B1

TP SEN 2-B1*

1

• Ignition switch: ON

(Engine stopped)

• Shift lever: D (A/T) or 1st (M/T)

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

EVAP SYS PRES

• Ignition switch: ON

Approx. 1.8 - 4.8V

START SIGNAL

• Ignition switch: ON 

→

 START 

→

 ON

OFF 

→

 ON 

→

 OFF

CLSD THL POS

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

ON

Accelerator pedal: Slightly depressed

OFF

AIR COND SIG

• Engine: After warming up, idle the en-

gine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates.)

ON

P/N POSI SW

• Ignition switch: ON

Shift lever: P or N (A/T), Neutral (M/T)

ON

Shift lever: Except above

OFF

PW/ST SIGNAL

• Engine: After warming up, idle the en-

gine

Steering wheel: Not being turned

OFF

Steering wheel: Being turned

ON

LOAD SIGNAL

• Ignition switch: ON

Lighting switch: 2nd

ON

Lighting switch: OFF

OFF

IGNITION SW

• Ignition switch: ON 

→

 OFF 

→

 ON

ON 

→

 OFF 

→

 ON

EC-398

< ECU DIAGNOSIS >

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ECM

HEATER FAN SW

• Engine: After warming up, idle the en-

gine

Heater fan: Operating

ON

Heater fan: Not operating

OFF

BRAKE SW

• Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

INJ PULSE-B1

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 4.0 msec

IGN TIMING

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

10

°

 - 20

°

 BTDC

2,000 rpm

25

°

 - 45

°

 BTDC

CAL/LD VALUE

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

10% - 35%

2,500 rpm

10% - 35%

MASS AIRFLOW

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

1.0 - 4.0 g·m/s

2,500 rpm

4.0 - 12.0 g·m/s

PURG VOL C/V

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle
(Accelerator pedal is not depressed 
even slightly, after engine starting)

0%

2,000 rpm

—

INT/V TIM (B1)

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

−

5

°

 - 5

°

CA

2,000 rpm

Approx. 0

°

 - 20

°

CA

INT/V SOL (B1)

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

0% - 2%

2,000 rpm

Approx. 0% - 60%

AIR COND RLY

• Engine: After warming up, idle the en-

gine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates)

ON

FUEL PUMP RLY

• For 1 second after turning ignition switch ON
• Engine running or cranking

ON

• Except above conditions

OFF

VENT CONT/V

• Ignition switch: ON

OFF

THRTL RELAY

• Ignition switch: ON

ON

HO2S2 HTR (B1)

• Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 

1 minute under no load.

ON

• Engine speed: Above 3,600 rpm

OFF

VEHICLE SPEED

• Turn drive wheels and compare CONSULT-III value with the speedometer indica-

tion.

Almost the same speed as 
the speedometer indica-
tion

TRVL AFTER MIL

• Ignition switch: ON

Vehicle has traveled after MIL has 
turned ON.

0 - 65,535 km 
(0 - 40,723 mile)

A/F S1 HTR (B1)

• Engine: After warming up, idle the engine

0 - 100%

AC PRESS SEN

• Engine: Idle
• Both A/C switch and blower fan switch: ON (Compressor operates)

1.0 - 4.0V

MONITOR ITEM

CONDITION

SPECIFICATION