Infiniti I35 (A33). Manual — part 241
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-696.
5
CHECK IGNITION SPARK
1. Turn ignition switch OFF.
2. Remove ignition coil assembly from rocker cover.
3. Connect a known good spark plug to the ignition wire.
4. Disconnect all injector harness connectors.
5. Place end of spark plug against a suitable ground and crank engine.
6. Check for spark.
SEF575Q
OK or NG
OK
©
GO TO 6.
NG
©
Check ignition coil, power transistor and their circuits. Refer to “IGNITION SIGNAL”,
EC-685.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0300 - P0306 MULTIPLE CYLINDER MISFIRE, NO. 1 - 6 CYLINDER
MISFIRE
Diagnostic Procedure (Cont’d)
EC-305
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-17, “Changing Spark Plugs”.
7
CHECK COMPRESSION PRESSURE
Check compression pressure. Refer to EM-13, “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.
8
CHECK FUEL PRESSURE
1. Install all removed parts.
2. Release fuel pressure to zero. Refer to EC-55.
3. Install fuel pressure gauge and check fuel pressure. Refer to EC-55.
At idle:
Approx. 350 kPa (3.57 kg/cm
2
, 51 psi)
OK or NG
OK
©
GO TO 9.
NG
©
Follow the instruction of “Fuel Pressure Check”, EC-55.
DTC P0300 - P0306 MULTIPLE CYLINDER MISFIRE, NO. 1 - 6 CYLINDER
MISFIRE
Diagnostic Procedure (Cont’d)
EC-306
9
CHECK IGNITION TIMING
Check the following items. Refer to “Basic Inspection”, EC-120.
MTBL1839
OK or NG
OK (With CONSULT-II)
©
GO TO 10.
OK (Without CONSULT-
II)
©
GO TO 11.
NG
©
Follow the “Basic Inspection”.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0300 - P0306 MULTIPLE CYLINDER MISFIRE, NO. 1 - 6 CYLINDER
MISFIRE
Diagnostic Procedure (Cont’d)
EC-307
10
CHECK HEATED OXYGEN SENSOR 1
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “MANU TRIG” and “HI SPEED” in “DATA MONITOR” mode with CONSULT-II, and select “HO2S1 (B1)/(B2)” and
“HO2S1 MNTR (B1)/(B2)”.
3. Hold engine speed at 2,000 rpm under no load during the following steps.
4. Touch “RECORD” on CONSULT-II screen.
SEF967Y
5. Check the following.
I
“HO2S1 MNTR (B1)/(B2)” in “DATA MONITOR” mode changes from “RICH” to “LEAN” to “RICH” 5 times in 10 seconds.
5 times (cycles) are counted as shown left:
SEF647Y
I
“HO2S1 (B1)/(B2)” voltage goes above 0.6V at least once.
I
“HO2S1 (B1)/(B2)” voltage goes below 0.3V at least once.
I
“HO2S1 (B1)/(B2)” voltage never exceeds 1.0V.
SEF648Y
CAUTION:
I
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
I
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubricant.
OK or NG
OK
©
GO TO 12.
NG
©
Replace malfunctioning heated oxygen sensor 1.
DTC P0300 - P0306 MULTIPLE CYLINDER MISFIRE, NO. 1 - 6 CYLINDER
MISFIRE
Diagnostic Procedure (Cont’d)
EC-308
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