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Home >> Nissan-Datsun Truck >> 1997 >> D21 Hardbody SE King Cab 4WD L4-2389cc 2.4L SOHC MFI (KA24E) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0440

P0440

NOTE: If both DTC P0440 and P0446 are displayed, perform TROUBLE DIAGNOSIS FOR PO446 first.

ON BOARD DIAGNOSIS LOGIC
This diagnosis uses two methods to detect leaks in the EVAP purge line.
The first method, the pressure test, makes use of vapor pressure in the fuel tank. The second method, the vacuum test, makes use of engine intake manifold vacuum.

Pressure Test
The EVAP canister vent control valve is closed to shut the EVAP purge line. The vacuum cut valve bypass valve will then be opened to clear the line between the fuel tank and the EVAP canister purge control valve. The EVAP control system pressure sensor can now monitor the pressure inside the fuel tank.
If pressure increases, the ECM will check for leaks in the line between the vacuum cut valve and EVAP canister purge control valve. If no pressure does not increase, the ECM will perform the "Vacuum test".




Vacuum Test
If pressure does not increase in the "Pressure test", the ECM will check for leaks in the line between the fuel tank and EVAP canister purge control valve, under the following "Vacuum test" conditions.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge control valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control valve and EVAP canister purge control valve are opened to depressurize the EVAP purge line using intake manifold vacuum. After this occurs, the EVAP canister purge control valve and EVAP canister purge volume control valve will be closed.





CAUTION:
- Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may come on.
- If the fuel filler cap is not tightened properly, the MIL may come on.
- Use only a genuine rubber tube as a replacement.

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
With CONSULT

CAUTION:
- Always select "SINGLE TEST" with CONSULT when performing the "FUNCTION TEST".




- Perform "FUNCTION TEST" when the fuel level is less than 3/4 full. If not, inspect fuel filler cap and fuel tank separately.
(1) Select "EVAP (SMALL LEAK)" in "FUNCTION TEST" mode with CONSULT.
(2) Make sure that "OK" is displayed with "EVAP (SMALL LEAK)". (If "NG" is displayed, refer to "DIAGNOSTIC PROCEDURE".)
(3) Check fuel filler cap and fuel tank when the fuel tank is more than 3/4 full. Refer to "DIAGNOSTIC PROCEDURE".

OR

Without CONSULT
(1) Start engine and warm it up sufficiently.




(2) Check voltage between ECM terminal (63) and ground (Voltage 1).

Voltage: 1.9 - 4.2 V.




(3) Check voltage between ECM terminal (51) and ground.

Voltage: 0.8 - 1.5V

Perform the following procedure before the voltage drops below 0.8V. If the voltage drops below 0.8V, cool down the engine and perform the entire procedure over again.




(4) Check voltage between ECM terminal (28) and ground.

Voltage: 1.9 - 4.1V

(5) Turn ignition switch "OFF" and wait at least 7 seconds.
(6) Turn ignition switch "ON" and wait at least 12 seconds.
(7) Restart engine and let it idle for at least 70 seconds.
(8) Maintain the following conditions for at least 40 seconds consecutively.

Gear position: Suitable gear position
Vehicle speed: 50 - 70 km/h (31 - 43 MPH)
Engine speed: 1,500 - 2,500 rpm

(9) Decelerate the vehicle to 0 km/h and let engine idle.
(10) Maintain the following conditions for at least 5 seconds consecutively.

Gear position: "1" or "2" position
Vehicle speed: 40 - 60 km/h (25 - 37 MPH)
Engine speed: 1,500 - 2,500 rpm

(11) Perform steps 9,10 more than 10 times.
(12) Decelerate the vehicle to 0 km/h and let engine idle.
(13) Maintain the following condition for at least continuous 10 seconds.

Gear position: Suitable gear position
Vehicle speed: 40 - 80 km/h (25 - 50 MPH)
Engine speed: 1,000 - 3,000 rpm

(14) Decelerate the vehicle to 0 km/h and let engine idle, then wait at least 11 minutes.
(15) Check voltage between ECM terminal (63) and ground (Voltage 2).

Voltage: 1.9 - 4.2V

(16) Check voltage decrease between voltage 1 and 2.

Voltage 1 - Voltage 2 >= 0.1V




(17) Check voltage between ECM terminal (23) and ground (Voltage 3).

Voltage: 0.3 - 0.7V

(18) Maintain the following conditions for 9 minutes measuring voltage between ECM terminal (23) and ground (Voltage 4) after 12 minutes have passed from restarting engine in step 7.

Gear position: Suitable gear position
Vehicle speed: 20 - 80 km/h (12 - 50 MPH)
Engine speed: 800 - 2,200 rpm (An models)
800 - 3,000 rpm (M/T models)
Voltage 4 - Voltage 3 <= 0.5V (2WD M/T)
0.7V (2WD A/T)
0.8V (4WD)

(19) Stop the vehicle, turn ignition switch "OFF", wait at least 7 seconds and then turn "ON".
(20) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

NOTE:
- Hold the accelerator pedal as steady as possible during driving in steps 8,10,13 and 18.
- If the driving conditions do not conform to those specified in steps 8,10,13 and 18, the procedure must be performed again under the specified conditions.
- It is better that the fuel level is low.
- While warming up the engine or idling it for more than 30 seconds, keep the engine hood open. Close the engine hood before driving the vehicle.










DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
EVAP Canister Purge Volume Control Valve
With CONSULT
1. Disconnect EVAP canister purge volume control valve harness connector.




2. Check resistance between the following terminals.
terminal (2) and terminals (1), (3)
terminal (5) and terminals (4), (6)

Resistance: Approximately 30 ohms [At 25°C (77°F)]

3. Reconnect EVAP canister purge volume control valve harness connector.
4. Remove EVAP canister purge volume control valve from intake manifold collector and disconnect hoses from the valve. (Plug the purge hoses. The EVAP canister purge volume control valve harness connector should remain connected.)
5. Turn ignition switch "ON".




6. Perform "PURG VOL CANT/V" in "ACTIVE TEST" mode with CONSULT. Check that EVAP canister purge volume control valve shaft moves smoothly forward and backward according to the valve opening.
If NG, replace the EVAP canister purge volume control valve.

OR

Without CONSULT
1. Disconnect EVAP canister purge volume control valve harness connector.




2. Check resistance between the following terminals.
terminal (2) and terminals (1), (3)
terminal (5) and terminals (4), (6)

Resistance: Approximately 30 ohms [At 25°C (77°F)]

3. Reconnect EVAP canister purge voltage control valve harness connector.
4. Remove EVAP canister purge volume control valve from intake manifold collector and disconnect hoses from the valve. (Plug the purge hoses. The EVAP canister purge volume control valve harness connector should remain connected.)




5. Turn ignition switch "ON" and "OFF". Check that EVAP canister purge volume control valve shaft moves smoothly forward and backward according to the ignition switch position.




If NG, replace the EVAP canister purge volume control valve.

EVAP Canister Purge Control Solenoid Valve
Check air passage continuity.




Condition / Air passage continuity between (A) and (B) / Air passage continuity between (A) and (C)
12V direct current supply between terminals / Yes / No
No supply / No / Yes

If NG, replace solenoid valve.

EVAP Canister Purge Control Valve
Check EVAP canister purge control valve as follows:




1. Plug the port B.
2. Apply pressure [80.0 kPa (600 mmHg, 23.62 inHg, 11.60 psi)] to port A. Then keep it for 15 seconds and check there is no leakage.
3. Repeat step 2 for port C.

EVAP Canister Vent Control Valve
Check air passage continuity.




Condition / Air passage continuity between (A) and (B)
12V direct supply between terminal (1) and (2) / No
No supply / Yes

If NG, clean valve using air blower or replace as necessary. Make sure new O-ring is installed properly.

Absolute Pressure Sensor
1. Remove absolute pressure sensor from bracket with its harness connector connected.
2. Remove hose from absolute pressure sensor.
3. Turn ignition switch "ON" and check output voltage between terminal (2) and engine ground. The voltage should be 3.2 to 4.8 V.




4. Use pump to apply vacuum of -26.7 kPa (-200 mmHg, -7.87 in Hg, -3.87 psi) to absolute pressure sensor as shown in figure and check the output voltage.
The voltage should be 1.0 to 1.4 V lower than the value measured in step 3.

CAUTION: Always calibrate the vacuum pump gauge when using it.

5. If NG, replace absolute pressure sensor.

MAP/BARO Switch Solenoid Valve
With CONSULT
1. Start engine and warm it up sufficiently.
2. Perform "MAP/BARO SW/V" in "ACTIVE TEST" mode with CONSULT
3. Check the following.




- When "MAP" is selected, "ABSOL PRES/SE" indicates approximately 1.3V.




- When "BARO" is selected, "ABSOL PRES/SE" indicates approximately 4.3V.
4. It NG, replace solenoid valve.

OR

Without CONSULT
1. Remove MAP/BARO Switch Solenoid Valve.
2. Check air passage continuity.




Condition / Air passage continuity between (A) and (B) / Air passage continuity between (A) and (C)
12V direct current supply between terminals (1) and (2) / Yes / No
No supply / NO / Yes

3. If NG, replace solenoid valve.

Tank Fuel Temperature Sensor




Check resistance by heating with hot water or heat gun as shown in the figure.


Temperature, °C (°F) / Resistance, K Ohms
20 (68) / 2.3 - 2.7
50 (122) / 0.79 - 0.90

If NG, replace tank fuel temperature sensor.

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