Infiniti M45 (Y34). Manual — part 409
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
EC-325
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EC
4.
CHECK IGNITION TIMING
Check the following items. Refer to
OK or NG
OK
>> GO TO 5.
NG
>> Follow the
5.
CHECK INJECTORS
1.
Stop engine and then turn ignition switch ON.
2.
Check voltage between ECM terminals 5, 6, 7, 13, 14, 15, 16, 17
and ground with CONSULT-II or tester.
3.
Refer to Wiring Diagram for Injectors,
OK or NG
OK
>> GO TO 6.
NG
>> Perform
EC-665, "Diagnostic Procedure"
6.
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 coil assembly.
4.
Disconnect all injector harness connectors.
5.
Place end of spark plug against a suitable ground and crank engine.
6.
Check for spark.
OK or NG
OK
>> GO TO 7.
NG
>> Check ignition coil with power transistor and their circuit.
Refer to
.
Items
Specifications
Ignition timing
12
°
±
5
°
BTDC (in P or N position)
Target idle speed
650
±
50 rpm (in P or N position)
Voltage: Battery voltage
PBIB0069E
SEF575Q
EC-326
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
7.
CHECK INJECTOR
1.
Turn ignition switch OFF.
2.
Remove injector assembly.
Refer to
EM-31, "FUEL INJECTOR AND FUEL TUBE"
Keep fuel hose and all injectors connected to injector gallery.
3.
Disconnect all ignition coil harness connectors.
4.
Reconnect all injector harness connectors.
5.
Turn ignition switch ON.
Make sure fuel does not drip from injector.
OK or NG
OK (Does not drip.)>>GO TO 8.
NG (Drips.)>>Replace the injector(s) from which fuel is dripping.
8.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
Trouble is fixed.>>INSPECTION END
Trouble is not fixed.>>Replace three way catalyst assembly.
DTC P0441 EVAP CONTROL SYSTEM
EC-327
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EC
DTC P0441 EVAP CONTROL SYSTEM
PFP:14950
System Description
ABS002K0
NOTE:
If DTC P0441 is displayed with other DTC such as P2122, P2123, P2127, P2128 or P2138, first perform
trouble diagnosis for other DTC.
In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions.
Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP
canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP con-
trol system pressure sensor to intake manifold vacuum.
On Board Diagnosis Logic
ABS002K1
Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow
are adequate. If not, a malfunction is determined.
DTC Confirmation Procedure
ABS002K2
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.
TESTING CONDITION:
Always perform test at a temperature of more than 5
°
C (41
°
F).
WITH CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
SEF323U
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0441
0441
EVAP control system
incorrect purge flow
EVAP control system does not operate
properly, EVAP control system has a leak
between intake manifold and EVAP control
system pressure sensor.
●
EVAP canister purge volume control solenoid
valve stuck closed
●
EVAP control system pressure sensor and
the circuit
●
Loose, disconnected or improper connection
of rubber tube
●
Blocked rubber tube
●
Cracked EVAP canister
●
EVAP canister purge volume control solenoid
valve circuit
●
Accelerator pedal position sensor
●
Blocked purge port
●
EVAP canister vent control valve
EC-328
DTC P0441 EVAP CONTROL SYSTEM
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and let it idle for at least 70 seconds.
4.
Select “PURG FLOW P0441” of “EVAPORATIVE SYSTEM” in
“DTC CONFIRMATION” mode with CONSULT-II.
5.
Touch “START”.
If “COMPLETED” is displayed, go to step 7.
6.
When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions con-
tinuously until “TESTING” changes to “COMPLETED”. (It will
take at least 35 seconds.)
If “TESTING” is not changed for a long time, retry from step 2.
7.
Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”. If “NG” is displayed, refer to
.
Overall Function Check
ABS002K3
Use this procedure to check the overall monitoring function of the EVAP control system purge flow monitoring.
During this check, a 1st trip DTC might not be confirmed.
WITH GST
1.
Lift up drive wheels.
2.
Start engine (VDC switch OFF) and warm it up to normal operating temperature.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and wait at least 70 seconds.
5.
Set voltmeter probes to ECM terminals 110 (EVAP control sys-
tem pressure sensor signal) and ground.
6.
Check EVAP control system pressure sensor value at idle speed
and note it.
7.
Establish and maintain the following conditions for at least 1
minute.
8.
Verify that EVAP control system pressure sensor value stays 0.1V less than the value at idle speed (mea-
sured at step 6) for at least 1 second.
Selector lever
Suitable position
VHCL SPEED SE
32 - 120 km/h (20 - 75 MPH)
ENG SPEED
500 - 3,800 rpm
B/FUEL SCHDL
1.0 - 10.0 msec
COOLAN TEMP/S
70 - 100
°
C (158 - 212
°
F)
SEF189Y
PBIB0826E
Air conditioner switch
ON
Headlamp switch
ON
Rear window defogger switch
ON
Engine speed
Approx. 3,000 rpm
Selector lever
Any position other than P, N or R
PBIB0167E
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