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 

EC-81, "Basic Inspection"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Follow the 

EC-81, "Basic Inspection"

 .

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, 

EC-662

 .

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 

EC-649, "IGNITION SIGNAL"

 .

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

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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 

EC-

329, "Diagnostic Procedure"

 .

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