Nissan Frontier. Manual - part 595

VIAS

EC-951

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

OK or NG

OK

>> Repair or replace power valve actuator.

NG

>> GO TO 4.

4.

CHECK VACUUM HOSE

1. Stop engine.

2. Check hoses and tubes between intake manifold and power

valve actuator for cracks, clogging, improper connection or dis-

connection. Refer to 

EC-506, "Vacuum Hose Drawing"

.

OK or NG

OK

>> GO TO 5.

NG

>> Repair hoses or tubes.

5.

CHECK VACUUM TANK

Refer to 

EC-952, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> Replace vacuum tank. Refer to 

EM-142, "Exploded View"

.

6.

CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect VIAS control solenoid valve harness connector.

3. Turn ignition switch ON.

4. Check voltage between terminal 1 and ground with CONSULT or tester.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• Harness for open or short between VIAS control solenoid valve and IPDM E/R

• Harness for open or short between VIAS control solenoid valve and ECM

>> Repair harness or connectors.

Condition

Vacuum

12V direct current supply

Should exist.

No supply

Should not exist.

SEF109L

BBIA0569E

Voltage: Battery voltage

EC-952

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

VIAS

8.

CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 39 and VIAS control solenoid valve terminal 2.

Refer to Wiring Diagram.

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

OK

>> GO TO 9.

NG

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

9.

CHECK VIAS CONTROL SOLENOID VALVE

Refer to 

EC-952, "Component Inspection"

.

OK or NG

OK

>> GO TO 10.

NG

>> Replace VIAS control solenoid valve. Refer to 

EM-142, "Exploded View"

.

10.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009481654

VIAS CONTROL SOLENOID VALVE

 With CONSULT

1. Reconnect harness connectors disconnected.
2. Turn ignition switch ON.
3. Perform “VIAS S/V-1” in “ACTIVE TEST” mode.
4. Check air passage continuity and operation delay time under the

following conditions.

Operation takes less than 1 second.

 Without CONSULT

Check air passage continuity and operation delay time under the fol-

lowing conditions.

Operation takes less than 1 second.

VACUUM TANK

Continuity should exist.

Condition

VIAS SOL VALVE

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

ON

Yes

No

OFF

No

Yes

JMBIA0180ZZ

Condition

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

12V direct current supply 
between terminals 1 and 2

Yes

No

No supply

No

Yes

PBIB2532E

VIAS

EC-953

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

1. Disconnect vacuum hose connected to vacuum tank.

2. Connect a vacuum pump to the port (A) of vacuum tank.

3. Apply vacuum and make sure that vacuum exists at the port (B).

PBIB0846E

EC-954

< SYMPTOM DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

ENGINE CONTROL SYSTEM SYMPTOMS

SYMPTOM DIAGNOSIS

ENGINE CONTROL SYSTEM SYMPTOMS

Symptom Matrix Chart

INFOID:0000000009481655

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-932

Fuel  pressure  regulator  system

3

3

4

4

4

4

4

4

4

4

EC-959

Fuel  injector  circuit

1

1

2

3

2

2

2

2

EC-928

Evaporative  emission  system

3

3

4

4

4

4

4

4

4

4

EC-497

Air

Positive crankcase ventilation sys-
tem

3

3

4

4

4

4

4

4

4

4

1

EC-945

Incorrect idle speed adjustment

1

1

1

1

1

EC-584

Electric  throttle  control  actuator

1

1

2

3

3

2

2

2

2

2

2

EC-893

, 

EC-899

Ignition Incorrect  ignition  timing  adjustment

3

3

1

1

1

1

1

1

EC-584

Ignition  circuit

1

1

2

2

2

2

2

2

EC-935

Power  supply  and  ground  circuit

2

2

3

3

3

3

3

2

3

EC-615

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

EC-633

, 

EC-637

Engine coolant temperature sensor circuit

3

3

3

EC-650

, 

EC-657

Air fuel ratio (A/F) sensor 1

EC-665
EC-669
EC-672
EC-694
EC-885

Throttle position sensor circuit

2

2

EC-653

, 

EC-726

, 

EC-843

, 

EC-845

, 

EC-908

Accelerator pedal position sensor circuit

3

2

1

EC-615

, 

EC-901

, 

EC-904

, 

EC-912