Infiniti FX35, FX50 (S51). Manual - part 807

 

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Infiniti FX35, FX50 (S51). Manual - part 807

 

 

P0078, P0084 EVT CONTROL SOLENOID VALVE

EC-769

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

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P0078, P0084 EVT CONTROL SOLENOID VALVE

Description

INFOID:0000000005237250

Exhaust valve timing control solenoid valve is activated by ON/OFF
pulse duty (ratio) signals from the ECM.
The exhaust valve timing control solenoid valve changes the oil
amount and direction of flow through exhaust valve timing control
unit or stops oil flow.
The longer pulse width retards valve angle.
The shorter pulse width advances valve angle.
When ON and OFF pulse widths become equal, the solenoid valve
stops oil pressure flow to fix the exhaust valve angle at the control
position.

DTC Logic

INFOID:0000000005237251

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test. 
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for 5 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-769, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237252

1.

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect exhaust valve timing (EVT) control solenoid valve harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between EVT control solenoid valve harness connector and ground.

PBIB1842E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0078

Exhaust valve timing control solenoid 
valve (bank 1) circuit

An improper voltage is sent to the ECM 
through exhaust valve timing control 
solenoid valve.

• Harness or connectors

(Exhaust valve timing control solenoid 
valve circuit is open or shorted.)

• Exhaust valve timing control solenoid 

valve

P0084

Exhaust valve timing control solenoid 
valve (bank 2) circuit

DTC

EVT control solenoid valve

Ground

Voltage

Bank

Connector

Terminal

P0078

1

F46

2

Ground

Battery voltage

P0084

2

F62

2

EC-770

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P0078, P0084 EVT CONTROL SOLENOID VALVE

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E10, F10
• Harness for open or short between EVT control solenoid valve and IPDM E/R

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

3.

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

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between EVT control solenoid valve harness connector and ECM harness connec-
tor.

4.

Also check harness for short to ground and short to power. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

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

4.

CHECK EVT CONTROL SOLENOID VALVE

Refer to 

EC-770, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace malfunctioning EVT control solenoid valve.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005237253

1.

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE-I

1.

Turn ignition switch OFF.

2.

Disconnect exhaust valve timing control solenoid valve harness connector.

3.

Check resistance between exhaust valve timing control solenoid valve terminals as per the following.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace malfunctioning exhaust valve timing control solenoid valve.

2.

CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE-II

1.

Remove exhaust valve timing control solenoid valve.

DTC

EVT control solenoid valve

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0078

1

F46

1

F111

61

Existed

P0084

2

F62

1

57

Terminals

Resistance

1 and 2

7.0 - 7.7 

Ω

 [at 20

°

C (68

°

F)]

1 or 2 and ground

∞

 

Ω

(Continuity should not exist)

P0078, P0084 EVT CONTROL SOLENOID VALVE

EC-771

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

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2.

Provide 12 V DC between exhaust valve timing control solenoid
valve terminals 1 and 2, and then interrupt it. Check that the
plunger moves as shown in the figure.

CAUTION:

Do not apply 12 V DC continuously for 5 seconds or more.
Doing so may result in damage to the coil in exhaust valve
timing control solenoid valve.
NOTE:
Always replace O-ring when exhaust valve timing control
solenoid valve is removed.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace malfunctioning exhaust valve timing control solenoid valve.

JMBIA0079ZZ

EC-772

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P0102, P0103, P010C, P010D MAF SENSOR

P0102, P0103, P010C, P010D MAF SENSOR

Description

INFOID:0000000005237259

The mass air flow sensor (1) is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sensor controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The greater air flow, the
greater the heat loss. 
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.

DTC Logic

INFOID:0000000005237260

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test. 
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

Which DTC is detected?

P0102, P010C>>GO TO 2.
P0103, P010D>>GO TO 3.

2.

PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0102 AND P010C

1.

Start engine and wait at least 5 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-773, "Diagnosis Procedure"

.

NO

>> INSPECTION END

3.

PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103 AND P010D-I

1.

Turn ignition switch ON and wait at least 5 seconds.

2.

Check DTC.

Is DTC detected?

PBIA9559J

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0102

Mass air flow sensor (bank 1) 
circuit low input

An excessively low voltage from the sensor 
is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Intake air leaks
• Mass air flow sensor

P0103

Mass air flow sensor (bank 1) 
circuit high input

An excessively high voltage from the sensor 
is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Mass air flow sensor

P010C

Mass air flow sensor (bank 2) 
circuit low input

An excessively low voltage from the sensor 
is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Intake air leaks
• Mass air flow sensor

P010D

Mass air flow sensor (bank 2) 
circuit high input

An excessively high voltage from the sensor 
is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Mass air flow sensor

 

 

 

 

 

 

 

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