Infiniti F50. Manual - part 453

DTC P1128 THROTTLE CONTROL MOTOR

EC-453

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2. 

CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT

1.

Disconnect electric throttle control actuator harness connector.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between the following terminals.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace.

3. 

CHECK THROTTLE CONTROL MOTOR

Refer to 

EC-453, "Component Inspection"

 .

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 5.

4. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace harness or connectors.

5. 

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace the electric throttle control actuator.

2.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

 .

3.

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

4.

Perform 

EC-46, "Idle Air Volume Learning"

 .

>> INSPECTION END

Component Inspection

EBS00MI6

THROTTLE CONTROL MOTOR

1.

Disconnect electric throttle control actuator harness connector.

2.

Check resistance between terminals 3 and 6.

3.

If NG, replace electric throttle control actuator and go to next
step.

4.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

.

5.

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

6.

Perform 

EC-46, "Idle Air Volume Learning"

 .

Electric throttle control 

actuator terminal

ECM terminal

Continuity

3

151

Should not exist

154

Should exist

6

151

Should exist

154

Should not exist

PBIB0015E

Resistance: Approximately 1 - 15 

Ω

 [at 25 

°

C (77

°

F)]

PBIB0095E

EC-454

DTC P1128 THROTTLE CONTROL MOTOR

Removal and Installation

EBS00MI7

ELECTRIC THROTTLE CONTROL ACTUATOR

Refer to 

EM-17, "INTAKE MANIFOLD"

 .

DTC P1140, P1145 IVT CONTROL POSITION SENSOR

EC-455

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DTC P1140, P1145 IVT CONTROL POSITION SENSOR

PFP:23731

Component Description

EBS00MI8

Intake valve timing control position sensors are located in the front of
cylinder heads in both bank 1 and bank 2.
This sensor uses a Hall IC.
The cam position is determined by the intake primary cam sprocket
concave (in four places). The ECM provides feedback to the intake
valve timing control for appropriate target valve open-close timing
according to drive conditions based on detected cam position.

CONSULT-II Reference Value in Data Monitor Mode

EBS00MI9

Specification data are reference values.

On Board Diagnosis Logic

EBS00MIA

DTC Confirmation Procedure

EBS00MIB

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and wait at
least 10 seconds before conducting the next test.

 WITH CONSULT-II

1.

Turn ignition switch “ON”.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Maintain the following conditions for at least 10 seconds.

4.

If 1st trip DTC is detected, go to 

EC-459, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

SEF359Z

MONITOR ITEM

CONDITION

SPECIFICATION

INT/V TIM (B1)
INT/V TIM (B2)

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

−

5 - 5

°

CA

2,000 rpm

Approx. 0 - 20

°

CA

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1140
1140
(bank 1)

Intake valve timing control 
position sensor circuit

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

●

Harness or connectors
(Intake valve timing control position 
sensor circuit is open or shorted)

●

Intake valve timing control position 
sensor

●

Crankshaft position sensor (POS)

●

Camshaft position sensor (PHASE)

●

Accumulation of debris to the signal 
pick-up portion of the camshaft

P1145
1145
(bank 2)

ENG SPEED

More than idle speed

Selector lever

“P” or “N” position

EC-456

DTC P1140, P1145 IVT CONTROL POSITION SENSOR

Wiring Diagram

EBS00MIC

BANK 1

TBWM0161E