Infiniti I30 (A33). Manual — part 254
SEF213Y
DTC Confirmation Procedure
NHEC0183
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 10 seconds
before conducting the next test.
WITH CONSULT-II
NHEC0183S01
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)
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.
NOTE:
Refer to the freeze frame data for the test driving conditions.
5)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-331.
WITH GST
NHEC0183S02
Follow the procedure “With CONSULT-II” above.
Diagnostic Procedure
NHEC0184
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
1. Stop engine and visually check exhaust tube, three way catalyst (Manifold) and muffler for dents.
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace it.
GI
MA
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LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0300 - P0306 NO. 6 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER
MISFIRE
DTC Confirmation Procedure
EC-331
3
PERFORM POWER BALANCE TEST
With CONSULT-II
1. Perform “POWER BALANCE” in “ACTIVE TEST” mode.
SEF070Y
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?
SEF281X
Yes or No
Yes
©
GO TO 4.
No
©
GO TO 7.
4
CHECK INJECTOR
Does each injector make an operating sound at idle?
MEC703B
Yes or No
Yes
©
GO TO 5.
No
©
Check injector(s) and circuit(s). Refer to EC-608.
DTC P0300 - P0306 NO. 6 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER
MISFIRE
Diagnostic Procedure (Cont’d)
EC-332
5
CHECK IGNITION SPARK
1. Disconnect ignition wire from spark plug.
2. Connect a known good spark plug to the ignition wire.
3. Place end of spark plug against a suitable ground and crank engine.
4. Check for spark.
SEF575Q
OK or NG
OK
©
GO TO 6.
NG
©
Check ignition coil, power transistor and their circuits. Refer to “DTC P1320 IGNITION
SIGNAL”, EC-506.
6
CHECK SPARK PLUGS
Remove the spark plugs and check for fouling, etc.
SEF156I
OK or NG
OK
©
GO TO 7.
NG
©
Repair or replace spark plug(s) with standard type one(s). For spark plug type, refer to
MA-13, “ENGINE MAINTENANCE”.
7
CHECK COMPRESSION PRESSURE
Check compression pressure. Refer to EM-12, “Measurement of Compression Pressure”.
Standard:
1,275 kPa (13.0 kg/cm
2
, 185 psi)/300 rpm
Minimum:
981 kPa (10.0 kg/cm
2
, 142 psi)/300 rpm
Difference between each cylinder:
98 kPa (1.0 kg/cm
2
, 14 psi)/300 rpm
OK or NG
OK
©
GO TO 8.
NG
©
Check pistons, piston rings, valves, valve seats and cylinder head gaskets.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0300 - P0306 NO. 6 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER
MISFIRE
Diagnostic Procedure (Cont’d)
EC-333
8
CHECK FUEL PRESSURE
1. Install all removed parts.
2. Release fuel pressure to zero. Refer to EC-49.
3. Install fuel pressure gauge and check fuel pressure. Refer to EC-49.
At idle:
Approx. 235 kPa (2.4 kg/cm
2
, 34 psi)
OK or NG
OK
©
GO TO 10.
NG
©
GO TO 9.
9
DETECT MALFUNCTIONING PART
Check the following.
I
Fuel pump and circuit (Refer to EC-618.)
I
Fuel pressure regulator (Refer to EC-50.)
I
Fuel lines (Refer to MA-16, “Checking Fuel Lines”.)
I
Fuel filter for clogging
©
Repair or replace.
10
CHECK IGNITION TIMING
Check the following items. Refer to “Basic Inspection”, EC-109.
MTBL0595
OK or NG
OK (With CONSULT-II)
©
GO TO 11.
OK (Without CONSULT-
II)
©
GO TO 12.
NG
©
Follow the “Basic Inspection”.
DTC P0300 - P0306 NO. 6 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER
MISFIRE
Diagnostic Procedure (Cont’d)
EC-334
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