Infiniti FX35, FX50 (S51). Manual - part 707

P1078, P1084 EVT CONTROL POSITION SENSOR

EC-369

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

>> INSPECTION END

Component Inspection

INFOID:0000000005236959

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 (-)

EC-370

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

P1148, P1168 CLOSED LOOP CONTROL

P1148, P1168 CLOSED LOOP CONTROL

DTC Logic

INFOID:0000000005236960

DTC DETECTION LOGIC

NOTE:
DTC P1148 or P1168 is displayed with another DTC for air fuel ratio (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 being driven 
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 being driven 
in the specified condition.

P1211 TCS CONTROL UNIT

EC-371

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

C

D

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P1211 TCS CONTROL UNIT

Description

INFOID:0000000005236961

The malfunction information related to TCS is transferred through the CAN communication line from “ABS
actuator and electric unit (control unit)” to ECM.
Be sure to erase the malfunction information such as DTC not only for “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.

DTC Logic

INFOID:0000000005236962

DTC DETECTION LOGIC

Freeze frame data is not stored in the ECM for this self-diagnosis.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for at least 60 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>>

EC-371, "Diagnosis Procedure"

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005236963

Go to 

BRC-5, "Work Flow"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1211

TCS control unit

ECM receives malfunction information from
“ABS actuator and electric unit (control unit)”.

• ABS actuator and electric unit (control 

unit)

• TCS related parts

EC-372

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

P1212 TCS COMMUNICATION LINE

P1212 TCS COMMUNICATION LINE

Description

INFOID:0000000005236964

This CAN communication line is used to control the smooth engine operation during the TCS operation. Pulse
signals are exchanged between ECM and “ABS actuator and electric unit (control unit)”.
Be sure to erase the malfunction information such as DTC not only for “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.

DTC Logic

INFOID:0000000005236965

DTC DETECTION LOGIC

NOTE:
• If DTC P1212 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1212 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-358, "DTC Logic"

.

Freeze frame data is not stored in the ECM for this self-diagnosis.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for at least 10 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-372, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005236966

Go to 

BRC-5, "Work Flow"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1212

TCS communication line

ECM cannot receive the information from 
“ABS actuator and electric unit (control 
unit)” continuously.

• Harness or connectors

(The CAN communication line is open or short-
ed.)

• ABS actuator and electric unit (control unit)
• Dead (Weak) battery