Infiniti M45 (Y34). Manual - part 402

DTC P0222, P0223 TP SENSOR

EC-297

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EC

6. 

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-297, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace the electric throttle control actuator.

2.

Perform 

EC-44, "Accelerator Pedal Released Position Learning"

 .

3.

Perform 

EC-44, "Throttle Valve Closed Position Learning"

 .

4.

Perform 

EC-44, "Idle Air Volume Learning"

 .

>> INSPECTION END

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS002IM

THROTTLE POSITION SENSOR

1.

Reconnect all harness connectors disconnected.

2.

Perform 

EC-44, "Accelerator Pedal Released Position Learning"

 .

3.

Perform 

EC-44, "Throttle Valve Closed Position Learning"

 .

4.

Turn ignition switch ON.

5.

Set selector lever to D position. 

6.

Check voltage between ECM terminals 108 (TP sensor 1 sig-
nal), 98 (TP sensor 2 signal) and ground under the following
conditions.

7.

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

8.

Perform 

EC-44, "Accelerator Pedal Released Position Learning"

 .

9.

Perform 

EC-44, "Throttle Valve Closed Position Learning"

 .

10. Perform 

EC-44, "Idle Air Volume Learning"

 .

Removal and Installation

ABS002IN

ELECTRIC THROTTLE CONTROL ACTUATOR

Refer to 

EM-18, "INTAKE MANIFOLD"

 .

Terminal

Accelerator pedal

Voltage

108
(Throttle position sensor 1)

Fully released

More than 0.36V

Fully depressed

Less than 4.75V

98
 (Throttle position sensor 2)

Fully released

Less than 4.75V

Fully depressed

More than 0.36V

PBIB0179E

EC-298

DTC P0300 - P0308 NO. 8 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER MIS-

FIRE

DTC P0300 - P0308 NO. 8 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER MIS-
FIRE

PFP:00020

On Board Diagnosis Logic

ABS002J4

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crank-
shaft position (CKP) sensor (POS) signal to vary, ECM can determine that a misfire is occurring.

The misfire detection logic consists of the following two conditions.

1.

One Trip Detection Logic (Three Way Catalyst Damage)
On the 1st trip that a misfire condition occurs that can damage the three way catalyst (TWC) due to over-
heating, the MIL will blink.
When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions
for a change.
When the misfire condition decreases to a level that will not damage the TWC, the MIL will turn off.
If another misfire condition occurs that can damage the TWC on a second trip, the MIL will blink.
When the misfire condition decreases to a level that will not damage the TWC, the MIL will remain on.
If another misfire condition occurs that can damage the TWC, the MIL will begin to blink again.

2.

Two Trip Detection Logic (Exhaust quality deterioration)
For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only
light when the misfire is detected on a second trip. During this condition, the ECM monitors the CKP sen-
sor signal every 1,000 engine revolutions.
A misfire malfunction can be detected on any one cylinder or on multiple cylinders.

Sensor

Input Signal to ECM

ECM function

Crankshaft position sensor (POS)

Engine speed

On board diagnosis of misfire

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0300
0300

Multiple cylinder misfire 
detected

Multiple cylinder misfire.

●

Improper spark plug

●

Insufficient compression

●

Incorrect fuel pressure

●

The injector circuit is open or shorted

●

Fuel injector

●

Intake air leak

●

The ignition signal circuit is open or 
shorted

●

Lack of fuel

●

Drive plate

●

Heated oxygen sensor 1

●

Incorrect PCV hose connection

P0301
0301

No.1 cylinder misfire 
detected

No. 1 cylinder misfires.

P0302
0302

No. 2 cylinder misfire 
detected

No. 2 cylinder misfires.

P0303
0303

No. 3 cylinder misfire 
detected

No. 3 cylinder misfires.

P0304
0304

No. 4 cylinder misfire 
detected

No. 4 cylinder misfires.

P0305
0305

No. 5 cylinder misfire 
detected

No. 5 cylinder misfires.

P0306
0306

No. 6 cylinder misfire 
detected

No. 6 cylinder misfires.

P0307
0307

No. 7 cylinder misfire 
detected

No. 7 cylinder misfires.

P0308
0308

No. 8 cylinder misfire 
detected

No. 8 cylinder misfires.

DTC P0300 - P0308 NO. 8 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER MIS-

FIRE

EC-299

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EC

DTC Confirmation Procedure

ABS002J6

CAUTION:

Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when driv-
ing.

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, and select “DATA MONITOR” mode
with CONSULT-II.

2.

Start engine and warm it up to normal operating temperature.

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Restart engine and let it idle for about 15 minutes.

5.

If 1st trip DTC is detected, go to 

EC-299, "Diagnostic Procedure"

.

NOTE:
If 1st trip DTC is not detected during above procedure, performing
the following procedure is advised.

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for a certain
time. Refer to the table below.
Hold the accelerator pedal as steady as possible.

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con-
ditions should be satisfied at the same time.

The time to driving varies according to the engine speed in the freeze frame data.

 WITH GST

Follow the procedure WITH CONSULT-II above.

Diagnostic Procedure

ABS002J7

1. 

CHECK FOR INTAKE AIR LEAK

1.

Start engine and run it at idle speed.

2.

Listen for the sound of the intake air leak.

OK or NG

OK

>> GO TO 2.

NG

>> Discover air leak location and repair.

PBIB0164E

Engine speed

Engine speed in the freeze frame data 

±

 400 rpm

Vehicle speed

Vehicle speed in the feaze frame data 

±

 10 km/h (6 MPH)

Engine coolant temperature 
(T) condition

When the freeze frame data shows lower than 70 

°

C (158 

°

F),

T should be lower than 70 

°

C (158 

°

F).

When the freeze frame data shows higher than or equal to 70 

°

C (158 

°

F),

T should be higher than or equal to 70 

°

C (158 

°

F).

Engine speed

Time 

Around 1,000 rpm

Approximately 10 minutes

Around 2,000 rpm

Approximately 5 minutes

More than 3,000 rpm

Approximately 3.5 minutes

EC-300

DTC P0300 - P0308 NO. 8 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER MIS-

FIRE

2. 

CHECK FOR EXHAUST SYSTEM CLOGGING

1.

Stop engine

2.

Turn ignition switch OFF

3.

Visually check exhaust tube, three way catalyst and muffler for dents.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace it.

3. 

PERFORM POWER BALANCE TEST

 With CONSULT-II

1.

Restart engine at idle.

2.

Perform “POWER BALANCE” in “ACTIVE TEST” mode.

3.

Is there any cylinder which does not produce a momentary
engine speed drop?

 Without CONSULT-II

When disconnecting each injector harness connector one at a time, is there any cylinder which does not pro-
duce a momentary engine speed drop?

Yes or No

Yes

>> GO TO 4.

No

>> GO TO 7.

4. 

CHECK INJECTOR

Does each injector make an operating sound at idle?

Yes or No

Yes

>> GO TO 5.

No

>> Check injector(s) and circuit(s). Refer to 

EC-661,

"INJECTOR CIRCUIT"

 .

PBIB0133E

PBIB1124E

PBIB1986E