Infiniti EX35. Manual - part 651

EC-346

< COMPONENT DIAGNOSIS >

[VQ35HR]

P1078, P1084 EVT CONTROL POSITION SENSOR

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK COMPONENTS

Check the following.
• Crankshaft position sensor (POS) (Refer to 

EC-255, "Component Inspection"

.)

• Camshaft position sensor (PHASE) (bank 2) (Refer to 

EC-260, "Component Inspection"

.)

• Battery current sensor (Refer to 

EC-379, "Component Inspection"

.)

• EVAP control system pressure sensor (Refer to 

EC-296, "Component Inspection"

.)

• Refrigerant pressure sensor (Refer to 

HAC-88, "Diagnosis Procedure"

.)

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace malfunctioning component.

6.

CHECK APP SENSOR

Refer to 

EC-423, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> GO TO 7.

7.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1.

Replace accelerator pedal assembly.

2.

Go to 

EC-423, "Special Repair Requirement"

.

>> INSPECTION END

8.

CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR GROUND CIRCUIT FOR OPEN AND

SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between exhaust valve timing control position sensor harness connector and ECM
harness connector.

4.

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

Is the inspection result normal?

YES

>> GO TO 9.

NO

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

9.

CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN

AND SHORT

F102

64

CMP sensor (PHASE) (bank 2)

F18

1

EVT control position sensor (bank 2)

F19

1

Battery current sensor

E21

1

M107

103

APP sensor

E112

6

107

EVAP control system pressure sensor

B252

3

111

Refrigerant pressure sensor

E77

3

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

DTC

EVT control position sensor

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P1078

1

F4

2

F102

88

Existed

P1084

2

F19

2

P1078, P1084 EVT CONTROL POSITION SENSOR

EC-347

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

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J

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EC

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O

1.

Check the continuity between exhaust valve timing control position sensor harness connector and ECM
harness connector.

2.

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

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F107, F106
• Harness for open or short between exhaust valve timing control position sensor and ECM

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

11.

CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR

Refer to 

EC-348, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace malfunctioning exhaust valve timing control position sensor.

12.

CHECK CRANKSHAFT POSITION SENSOR (POS)

Refer to 

EC-255, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace crankshaft position sensor (POS).

13.

CHECK CAMSHAFT POSITION SENSOR (PHASE)

Refer to 

EC-260, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Replace malfunctioning camshaft position sensor (PHASE).

14.

CHECK CAMSHAFT (EXH)

Check the following;
• Accumulation of debris to the signal plate of camshaft rear end
• Chipping signal plate of camshaft rear end

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Remove debris and clean the signal plate of camshaft

rear end or replace camshaft.

15.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

DTC

EVT control position sensor

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P1078

1

F4

3

F102

58

Existed

P1084

2

F19

3

62

JMBIA0059ZZ

EC-348

< COMPONENT DIAGNOSIS >

[VQ35HR]

P1078, P1084 EVT CONTROL POSITION SENSOR

Component Inspection

INFOID:0000000003133502

1.

EXHAUST VALVE TIMING CONTROL POSITION SENSOR-I

1.

Turn ignition switch OFF.

2.

Disconnect exhaust valve timing control position sensor harness connector.

3.

Loosen the fixing bolt of the sensor.

4.

Remove the sensor.

5.

Visually check the sensor for chipping.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace malfunctioning exhaust valve timing control

position sensor.

2.

EXHAUST VALVE TIMING CONTROL POSITION SENSOR-II

Check resistance exhaust valve timing control position sensor terminals as shown below.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace malfunctioning exhaust valve timing control position sensor.

JMBIA0065ZZ

Terminals

Resistance

1 (+) - 2 (-)

Except 0 or 

∞

 

Ω

 [at 25

°

C (77

°

F)]

1 (+) - 3 (-)

2 (+) - 3 (-)

P1148, P1168 CLOSED LOOP CONTROL

EC-349

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

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P1148, P1168 CLOSED LOOP CONTROL

DTC Logic

INFOID:0000000003133503

DTC DETECTION LOGIC

NOTE:
DTC P1148 or P1168 is displayed with another DTC for A/F sensor 1.
Perform the trouble diagnosis for the corresponding DTC.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1148

Closed loop control 
function (bank 1)

The closed loop control function for bank 1 does 
not operate even when vehicle is driving in the 
specified condition.

• Harness or connectors

(The A/F sensor 1 circuit is open or short-
ed.)

• A/F sensor 1
• A/F sensor 1 heater

P1168

Closed loop control 
function (bank 2)

The closed loop control function for bank 2 does 
not operate even when vehicle is driving in the 
specified condition.