Nissan Primera P11. Manual — part 166
9
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-QG-102.
©
INSPECTION END
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
(RICH SIDE)
QG16
I
18DE
Diagnostic Procedure (Cont’d)
EC-221
On Board Diagnosis Logic
NCEC0202
When a misfire occurs, the engine speed will fluctuate. If the engine speed fluctuates enough to cause the
CKP sensor signal to vary, The ECM can determine that a misfire is occurring.
Sensor
Input Signal to ECM
ECM function
Crankshaft position sensor (POS)
Engine speed
On board diagnosis of misfire
The misfire detection logic consists of the following two conditions.
1. One Trip Detection Logic (Three Way Catalyst Damage)
On the first trip that a misfire condition occurs that can damage the three way catalyst (TWC) due to
overheating, the MI 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 MI will turn off.
If another misfire condition occurs that can damage the TWC on a second trip, the MI will blink.
When the misfire condition decreases to a level that will not damage the TWC, the MI will remain on.
If another misfire condition occurs that can damage the TWC, the MI will begin to blink again.
(After the first trip detection, the MI will light up from engine starting. If a misfire is detected that will cause
three way catalyst damage, the MI will start blinking.)
2. Two Trip Detection Logic (Exhaust quality deterioration)
For misfire conditions that will not damage the TWC (but will affect emissions), the MI will only light when
the misfire is detected on a second trip. During this condition, the ECM monitors the CKP sensor signal
every 1,000 engine revolutions.
A misfire malfunction can be detected on any one cylinder or on multiple cylinders.
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0300
0300
I
Multiple cylinders misfire.
I
Improper spark plug
I
Insufficient compression
I
Incorrect fuel pressure
I
EGR volume control valve (If so equipped)
I
The injector circuit is open or shorted
I
Injectors
I
Intake air leak
I
Insufficient ignition spark
I
Lack of fuel
I
Heated oxygen sensor 1 (front)
P0301
0301
I
No. 1 cylinder misfires.
P0302
0302
I
No. 2 cylinder misfires.
P0303
0303
I
No. 3 cylinder misfires.
P0304
0304
I
No. 4 cylinder misfires.
DTC Confirmation Procedure
NCEC0203
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 9 seconds
before conducting the next test.
With CONSULT-II
1)
Turn ignition switch “ON”, and select “DATA MONITOR” mode
with CONSULT-II.
NEF068A
DTC P0300 - P0304 NO. 4 - 1 CYLINDER MISFIRE,
MULTIPLE CYLINDER MISFIRE
QG16
I
18DE
On Board Diagnosis Logic
EC-222
2)
Start engine and warm it up to normal operating temperature.
3)
Turn ignition switch “OFF” and wait at least 9 seconds.
4)
Start engine again and drive at 1,500 - 3,000 rpm for at least
3 minutes.
Hold the accelerator pedal as steady as possible.
NOTE:
Refer to the freeze frame data for the test driving conditions.
5)
If 1st trip DTC is detected, go to “Diagnostic Procedure”, EC-
QG-223.
With GST
Follow the procedure “With CONSULT-II” above.
Diagnostic Procedure
NCEC0204
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.
2
CHECK FOR EXHAUST SYSTEM CLOGGING
Stop engine and visually check exhaust tube, three way catalyst and muffler for dents.
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace it.
3
CHECK EGR FUNCTION (If so equipped)
Perform DTC Confirmation Procedure for DTC P1402 EGR FUNCTION (OPEN).
Refer to EC-QG-305.
OK or NG
OK
©
GO TO 4.
NG
©
Repair EGR system.
DTC P0300 - P0304 NO. 4 - 1 CYLINDER MISFIRE,
MULTIPLE CYLINDER MISFIRE
QG16
I
18DE
DTC Confirmation Procedure (Cont’d)
EC-223
4
PERFORM POWER BALANCE TEST
With CONSULT-II
1. Perform “POWER BALANCE” in “ACTIVE TEST” mode.
NEF105A
2. 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 produce a
momentary engine speed drop?
SEF055X
Yes or No
Yes
©
GO TO 5.
No
©
GO TO 7.
5
CHECK INJECTOR
Does each injector make an operating sound at idle?
MEC703B
Yes or No
Yes
©
GO TO 6.
No
©
Check injector(s) and circuit(s). Refer to EC-QG-319.
DTC P0300 - P0304 NO. 4 - 1 CYLINDER MISFIRE,
MULTIPLE CYLINDER MISFIRE
QG16
I
18DE
Diagnostic Procedure (Cont’d)
EC-224
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