Infiniti FX35, FX50 (S51). Manual - part 656

 

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Infiniti FX35, FX50 (S51). Manual - part 656

 

 

P0078, P0084 EVT CONTROL MAGNET RETARDER

EC-165

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0078, P0084 EVT CONTROL MAGNET RETARDER

Description

INFOID:0000000005236765

Exhaust valve timing control magnet retarder (1) controls the shut/
open timing of the exhaust valve by ON/OFF pulse duty signals sent
from the ECM.
The longer pulse width retards valve angle.
The shorter pulse width advances valve angle.

DTC Logic

INFOID:0000000005236766

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-165, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005236767

1.

CHECK EXHAUST VALVE TIMING (EVT) CONTROL MAGNET RETARDER POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect EVT control magnet retarder harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between EVT control magnet retarder harness connector and ground.

JMBIA0024ZZ

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0078

Exhaust valve timing control 
magnet retarder (bank 1) circuit

An improper voltage is sent to the ECM 
through exhaust valve timing control mag-
net retarder.

• Harness or connectors

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

• Exhaust valve timing control magnet re-

tarder

P0084

Exhaust valve timing control 
magnet retarder (bank 2) circuit

DTC

EVT control magnet retarder

Ground

Voltage

Bank

Connector

Terminal

P0078

1

F32

1

Ground

Battery voltage

P0084

2

F41

1

EC-166

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

P0078, P0084 EVT CONTROL MAGNET RETARDER

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E3, F1
• Harness for open or short between EVT control magnet retarder and IPDM E/R

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

3.

CHECK EVT CONTROL MAGNET RETARDER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between EVT control magnet retarder 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 MAGNET RETARDER

Refer to 

EC-166, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

REPLACE EVT CONTROL MAGNET RETARDER

1.

Replace malfunctioning EVT control magnet retarder.

2.

Perform 

EC-27, "EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement"

.

>> INSPECTION END

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005236768

1.

CHECK EXHAUST VALVE TIMING CONTROL MAGNET RETARDER

1.

Turn ignition switch OFF.

2.

Disconnect exhaust valve timing control magnet retarder harness connector.

3.

Check resistance between exhaust valve timing control magnet retarder terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

DTC

EVT control magnet retarder

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0078

1

F32

2

F101

6

Existed

P0084

2

F41

2

7

Terminals

Resistance

1 and 2

9.0 - 11.0 

Ω

 [at 20

°

C (68

°

F)]

P0078, P0084 EVT CONTROL MAGNET RETARDER

EC-167

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

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K

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M

A

EC

N

P

O

2.

REPLACE EXHAUST VALVE TIMING CONTROL MAGNET RETARDER

1.

Replace malfunctioning exhaust valve timing control magnet retarder.

2.

Perform 

EC-27, "EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement"

.

>> INSPECTION END

EC-168

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

P0101, P010B MAF SENSOR

P0101, P010B MAF SENSOR

Description

INFOID:0000000005236769

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:0000000005236770

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.

NOTE:
If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead
of running engine at idle speed.

PBIA9559J

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0101

Mass air flow sensor 
(bank 1) circuit range/
performance

A)

A high voltage from the sensor is sent to ECM 
under light load driving condition.

• Harness or connectors

(The sensor circuit is open or 
shorted.)

• Mass air flow sensor
• EVAP control system pressure 

sensor

B)

A low voltage from the sensor is sent to ECM un-
der heavy load driving condition.

• Harness or connectors

(The sensor circuit is open or 
shorted.)

• Intake air leaks
• Mass air flow sensor
• EVAP control system pressure 

sensor

• Intake air temperature sensor

P010B

Mass air flow sensor 
(bank 2) circuit range/
performance

A)

A high voltage from the sensor is sent to ECM 
under light load driving condition.

• Harness or connectors

(The sensor circuit is open or 
shorted.)

• Mass air flow sensor
• EVAP control system pressure 

sensor

B)

A low voltage from the sensor is sent to ECM un-
der heavy load driving condition.

• Harness or connectors

(The sensor circuit is open or 
shorted.)

• Intake air leaks
• Mass air flow sensor
• EVAP control system pressure 

sensor

• Intake air temperature sensor

 

 

 

 

 

 

 

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