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
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
PBIB0133E
PBIB1124E
PBIB1986E
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