Infiniti Q45 (FY33). Manual — part 183
SEF405UA
COMPONENT INSPECTION
Fuel tank temperature sensor
Check resistance by heating with hot water or heat gun as shown
in the figure.
Temperature °C (°F)
Resistance k
Ω
20 (68)
2.3 - 2.7
50 (122)
0.79 - 0.90
If NG, replace fuel tank temperature sensor.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0180
Fuel Tank Temperature Sensor (Cont’d)
EC-261
No. 1 - 8 Cylinder Misfire, Multiple Cylinder
Misfire
ON BOARD DIAGNOSIS LOGIC
If misfire occurs, the engine speed will fluctuate. If the fluctuation is detected by the crankshaft position sen-
sor (OBD), the misfire is diagnosed.
The misfire detection logic consists of the following two conditions.
Crankshaft position sensor (OBD)
E
Engine speed
ECM
1. One Trip Detection Logic (Three Way Catalyst Damage)
When a misfire is detected which will overheat and damage the three way catalyst, the malfunction indi-
cator lamp (MIL) will start blinking; even during the first trip. In this condition, ECM monitors the misfire
every 200 engine revolutions.
If the misfire frequency decreases to a level that will not damage the three way catalyst, the MIL will change
from blinking to lighting up.
(After the first trip detection, the MIL will light up from engine starting. If a misfire is detected that will cause
three way catalyst damage, the MIL will start blinking.)
2. Two Trip Detection Logic (Exhaust quality deterioration)
When a misfire that will not damage the three way catalyst (but will affect exhaust emission) occurs, the
malfunction indicator lamp will light up based on the second consecutive trip detection logic. In this
condition, ECM monitors the misfire for each 1,000 revolutions of the engine.
Diagnostic Trouble
Code No.
Malfunction is detected when ...
Check Items
(Possible Cause)
P0300 (0701)
I
Multiple cylinders misfire.
I
Improper spark plug
I
Insufficient compression
I
Incorrect fuel pressure
I
EGR valve
I
The injector circuit is open or shorted.
I
Injectors
I
Intake air leaks
I
The ignition secondary circuit is open or
shorted.
I
Lack of fuel
I
Magnetized signal plate (drive plate)
I
Heated oxygen sensor 1 (front)
P0301 (0608)
I
No. 1 cylinder misfires.
P0302 (0607)
I
No. 2 cylinder misfires.
P0303 (0606)
I
No. 3 cylinder misfires.
P0304 (0605)
I
No. 4 cylinder misfires.
P0305 (0604)
I
No. 5 cylinder misfires.
P0306 (0603)
I
No. 6 cylinder misfires.
P0307 (0602)
I
No. 7 cylinder misfires.
P0308 (0601)
I
No. 8 cylinder misfires.
SEF392X
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE (Overall)
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
1) Turn ignition switch “ON”, and select “DATA MONITOR”
mode with CONSULT-II.
TROUBLE DIAGNOSIS FOR DTC P0300 - P0308
EC-262
2) Start engine and warm it up to normal operating tem-
perature.
3) Turn ignition switch “OFF” and wait at least 5 seconds.
4) Start engine again and drive at 1,500 to 3,000 rpm for
at least 3 minutes.
Hold the accelerator pedal as steady as possible during
driving.
Refer to the freeze frame data for the test driving con-
ditions.
5) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-264.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0300 - P0308
No. 1 - 8 Cylinder Misfire, Multiple Cylinder
Misfire (Cont’d)
EC-263
SEC547A
SEF793X
SEF137T
SEF138T
MEC703B
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK FOR INTAKE AIR LEAK.
Start engine and run it at idle speed. Listen
for the sound of the intake air leak.
OK
E
NG
Discover air leak location
and repair.
CHECK FOR EXHAUST SYSTEM CLOG-
GING.
Stop engine and visually check exhaust
tube, three way catalyst and muffler for
dent.
OK
E
NG
Repair or replace it.
CHECK EGR FUNCTION.
Perform DTC CONFIRMATION PROCE-
DURE for EGR Function, EC-423.
OK
E
NG
Repair EGR system.
PERFORM POWER BALANCE TEST.
1. Perform “POWER BALANCE” in
“ACTIVE TEST” mode.
2. Is there any cylinder which does
not produce a momentary
engine speed drop?
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
When disconnecting each injector
harness connector one at a time, is
there any cylinder which does not
produce a momentary engine
speed drop?
Yes
E
No
Go to
.
CHECK INJECTOR.
Does each injector make an operating
sound at idle?
Yes
E
No
Check injector(s) and cir-
cuit(s). Refer to EC-515.
CHECK IGNITION SPARK.
1. Disconnect ignition coil assembly from
rocker cover.
2. Connect a known-good spark plug to
the ignition coil assembly.
3. Place end of spark plug against a suit-
able ground and crank engine.
4. Check for spark.
OK
E
NG
Check ignition coil with
power transistor and their
circuits. Refer to EC-399.
(Go to
q
A
on next page.)
TROUBLE DIAGNOSIS FOR DTC P0300 - P0308
No. 1 - 8 Cylinder Misfire, Multiple Cylinder
Misfire (Cont’d)
H
H
H
H
H
H
H
EC-264
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