Infiniti M35/M45 Y50. Manual - part 512

 

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Infiniti M35/M45 Y50. Manual - part 512

 

 

DTC P1226 TP SENSOR

EC-521

[VQ35DE]

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Diagnostic Procedure

NBS0053P

1. 

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1.

Turn ignition switch OFF.

2.

Remove the intake air duct.

3.

Check if foreign matter is caught between the throttle valve and
the housing.

OK or NG

OK

>> GO TO 2.

NG

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

2. 

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace the electric throttle control actuator.

2.

Perform 

EC-86, "Throttle Valve Closed Position Learning"

 .

3.

Perform 

EC-86, "Idle Air Volume Learning"

 .

>> INSPECTION END

Removal and Installation

NBS0053Q

ELECTRIC THROTTLE CONTROL ACTUATOR

Refer to 

EM-21, "INTAKE MANIFOLD COLLECTOR"

 .

PBIB1556E

EC-522

[VQ35DE]

DTC P1421 COLD START CONTROL

DTC P1421 COLD START CONTROL

PFP:23710

Description

NBS005S9

ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.

On Board Diagnosis Logic

NBS005SA

DTC Confirmation Procedure

NBS005SB

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.

●

If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Select “DATA MONITOR” mode with CONSULT-II.

4.

Check that the “COOLAN TEMP/S” indication is between 4

°

C

(39

°

F) and 36

°

C (97

°

F).

If “COOLAN TEMP/S” indication is within the specified value, go
to the following step.
If “COOLANT TEMP/S” indication is out of the specified value,
cool engine down or warm engine up and go to step 1.

5.

Start engine and let it idle for 5 minutes.

6.

If 1st trip DTC is detected, go to 

EC-522, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

Diagnostic Procedure

NBS005SC

1. 

PERFORM IDLE AIR VOLUME LEARNING

Perform 

EC-86, "Idle Air Volume Learning"

 .

Is Idle Air Volume Learning carried out successfully?
Yes or No

Yes

>> GO TO 2.

No

>> Follow the instruction of Idle Air Volume Learning.

2. 

CHECK INTAKE SYSTEM

Check for the cause of intake air volume lacking. Refer to the following.

●

Crushed intake air passage

●

Intake air passage clogging

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace malfunctioning part

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1421
1421

Cold start emission reduction 
strategy monitoring

ECM does not control ignition timing and engine 
idle speed properly when engine is started with 
prewarming up condition.

●

Lack of intake air volume

●

Fuel injection system

●

ECM

SEF174Y

DTC P1421 COLD START CONTROL

EC-523

[VQ35DE]

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3. 

CHECK FUEL INJECTION SYSTEM FUNCTION

Perform 

EC-309, "DTC Confirmation Procedure"

  in DTC P0171, P0174 FUEL INJECTION SYSTEM FUNC-

TION.

OK or NG

OK

>> GO TO 4.

NG

>> Go to 

EC-315, "Diagnostic Procedure"

 .

4. 

PERFORM DTC CONFIRMATION PROCEDURE

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “SELF DIAG RESULTS” mode with CONSULT-II.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-522, "DTC Confirmation Procedure"

 .

5.

Is the 1st trip DTC P1421 displayed again?

 With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.
See 

EC-522, "DTC Confirmation Procedure"

 .

4.

Is the 1st trip DTC P1421 displayed again?

Yes or No

Yes

>> GO TO 5.

No

>> INSPECTION END

5. 

REPLACE ECM

1.

Replace ECM.

2.

Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs.
Refer to 

BL-248, "ECM Re-Communicating Function"

 .

3.

Perform 

EC-85, "VIN Registration"

 .

4.

Perform 

EC-86, "Accelerator Pedal Released Position Learning"

 .

5.

Perform 

EC-86, "Throttle Valve Closed Position Learning"

 .

6.

Perform 

EC-86, "Idle Air Volume Learning"

 .

>> INSPECTION END

EC-524

[VQ35DE]

DTC P1550 BATTERY CURRENT SENSOR

DTC P1550 BATTERY CURRENT SENSOR

PFP:294G0

Component Description

NBS0053R

The power generation voltage variable control enables fuel con-
sumption to be decreased by reducing the engine load which is
caused by the power generation of the generator. The battery cur-
rent sensor (1) is installed to the battery cable at the negative termi-
nal. The sensor measures the charging/discharging current of the
battery. Based on the sensor signal, ECM judges whether or not the
power generation voltage variable control is performed. When per-
forming the power generation voltage variable control, ECM calcu-
lates the target power generation voltage based on the sensor
signal. And ECM sends the calculated value as the power genera-
tion command value to IPDM E/R. For the details of the power gen-
eration voltage variable control, refer to SC section.

CAUTION:

Do not connect the electrical component or the ground wire directly to the battery terminal. The con-
nection causes the malfunction of the power generation voltage variable control, and then the battery
discharge may occur.

CONSULT-II Reference Value in Data Monitor Mode

NBS0053S

Specification data are reference values.

*: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to 

SC-5, "SPECIFIC GRAVITY CHECK"

 .

On Board Diagnosis Logic

NBS0053T

The MIL will not light up for this diagnosis.

NOTE:
If DTC P1550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-486, "DTC P0643 SENSOR POWER SUPPLY"

 .

PBIB2685E

MONITOR ITEM

CONDITION

SPECIFICATION

BAT CUR SEN

●

Engine speed: Idle

●

Battery: Fully charged*

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Approx. 2,600 - 3,500mV

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1550
1550

Battery current sensor circuit 
range/performance

The output voltage of the battery current 
sensor remains within the specified 
range while engine is running.

●

Harness or connectors
(The sensor circuit is open or shorted.)

●

Battery current sensor

 

 

 

 

 

 

 

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