Nissan Frontier. Manual - part 700

VIAS

EC-1371

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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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.

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 29 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-1371, "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:0000000009482048

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

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

EC-1372

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

VIAS

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

lowing conditions.

Operation takes less than 1 second.

VACUUM TANK

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).

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

PBIB0846E

ENGINE CONTROL SYSTEM SYMPTOMS

EC-1373

< SYMPTOM DIAGNOSIS >

[VQ40DE FOR MEXICO]

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SYMPTOM DIAGNOSIS

ENGINE CONTROL SYSTEM SYMPTOMS

Symptom Matrix Chart

INFOID:0000000009482049

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-1350

Fuel  pressure  regulator  system

3

3

4

4

4

4

4

4

4

4

EC-1378

Fuel  injector  circuit

1

1

2

3

2

2

2

2

EC-1346

Evaporative  emission  system

3

3

4

4

4

4

4

4

4

4

EC-988

Air

Positive crankcase ventilation sys-
tem

3

3

4

4

4

4

4

4

4

4

1

EC-1364

Incorrect idle speed adjustment

1

1

1

1

1

EC-1068

Electric  throttle  control  actuator

1

1

2

3

3

2

2

2

2

2

2

EC-1314

, 

EC-1320

Ignition Incorrect  ignition  timing  adjustment

3

3

1

1

1

1

1

1

EC-1068

Ignition  circuit

1

1

2

2

2

2

2

2

EC-1354

Power  supply  and  ground  circuit

2

2

3

3

3

3

3

2

3

EC-1091

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

EC-1110

Engine coolant temperature sensor circuit

3

3

3

EC-1118

Air fuel ratio (A/F) sensor 1

EC-1129
EC-1133
EC-1137
EC-1141
EC-1305

Throttle position sensor circuit

2

2

EC-1122

, 

EC-1182

, 

EC-1267

, 

EC-1269

, 

EC-1329

Accelerator pedal position sensor circuit

3

2

1

EC-1091

, 

EC-1322

, 

EC-1325

, 

EC-1333

Knock sensor circuit

2

3

EC-1193

EC-1374

< SYMPTOM DIAGNOSIS >

[VQ40DE FOR MEXICO]

ENGINE CONTROL SYSTEM SYMPTOMS

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

SYSTEM — ENGINE MECHANICAL & OTHER

Crankshaft position sensor (POS) circuit

2

2

EC-1196

Camshaft position sensor (PHASE) circuit

3

2

EC-1200

Vehicle speed signal circuit

2

3

3

3

EC-1240

Power steering pressure sensor circuit

2

3

3

EC-1246

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-1249

, 

EC-1250

, 

EC-1251

, 

EC-1252

, 

EC-1253

, 

EC-1254

, 

EC-1255

Intake valve timing control solenoid valve cir-
cuit

3

2

1

3

2

2

3

3

EC-1107

PNP signal circuit

3

3

3

3

3

EC-1259

VIAS control solenoid valve circuit

1

EC-1299

Refrigerant pressure sensor circuit

2

3

3

4

EC-1366

Electrical load signal circuit

3

EC-1344

Air  conditioner  circuit

2

2

3

3

3

3

3

3

3

3

2

HAC-142

, 

HAC-208

ABS actuator and electric unit (control unit)

4

BRC-8

, 

BRC-120

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