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Home >> Nissan-Datsun >> 1997 >> Maxima GXE V6-2968cc 3.0L DOHC MFI (VQ30DE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1447

P1447




EVAPORATIVE EMISSION SYSTEM DIAGRAM

SYSTEM DESCRIPTION
In this evaporative emission (EVAP) control system, purge volume is related to air intake volume and occurs during non-closed throttle conditions. In normal purge conditions (non-closed throttle), the EVAP canister purge volume control valve and EVAP canister purge control valve are open to admit purge flow. Purge flow exposes the EVAP control system pressure sensor to intake manifold vacuum.




ON BOARD DIAGNOSIS LOGIC
In normal conditions (non-closed throttle), if the sensor output does not show the appropriate pressure drop in the EVAP purge line, lack of purge flow is indicated, and a fault is determined.

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the EVAP control system purge flow monitoring. During this check, a 1st trip DTC might not be confirmed.

With Consult
(1) Jack up drive wheels (M/T models).
(2) Start engine.




(3) Select "EVAP SYS PRES" in "DATA MONITOR" mode with CONSULT.
(4) Check EVAP control system pressure sensor value at idle speed.




(5) Select "PU HG VOL CONT/V" in "ACTIVE TEST" mode with CONSULT and set "PU HG VOL CONT/V" to 20 steps by touching "DWN" and "Qd".
(6) Maintain the following conditions at least 30 seconds. Verify that EVAP control system pressure sensor value ("EVAP SYS PRES") stays 0.1V less than that at idle speed at least 2 seconds.

Engine speed: Approx. 2,000 rpm
Gear position (for M/T models):
Any position other than "Neutral" or "Reverse"

CAUTION: Do not run vehicle up to speeds greater than 80 km/h (50 MPH).

OR

Without Consult
(1) Jack up drive wheels (M/T models).
(2) Start engine and warm it up sufficiently.
(3) Turn ignition switch "OFF", wait at least 5 seconds.
(4) Start engine and wait at least 70 seconds.




(5) Set voltmeter probes to ECM terminals (62) (EVAP control system pressure sensor signal) and (43) (ground).
(6) Check EVAP control system pressure sensor value at idle speed.
(7) Establish the following conditions and maintain at least 30 seconds, then completely return to normal conditions. Repeat this procedure 5 or more times.

Air conditioner switch: ON
Steering wheel: Fully turned
Headlamp switch: ON
Rear window defogger switch: ON
Engine speed: Approx. 3,500 rpm
Intake manifold vacuum:
-73.3 to -60.0 kPa (-550 to -450 mmHg,-21.65 to -17.72 inHg)
Gear position (for M/T models):
Any position other than "Neutral" or "Reverse"

Verify that EVAP control system pressure sensor value stays 0.1V less than that at idle speed at least 2 seconds.

CAUTION: Do not run vehicle up to speeds greater than 80 km/h (50 MPH).







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 CONTN" in "ACTIVE TEST" mode with CONSULT and ensure the EVAP canister purge volume control valve shaft smoothly moves 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 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" and "OFF" and ensure the EVAP canister purge volume control valve shaft smoothly moves forward and backward according to the ignition switch position.
If NG, replace the EVAP canister purge volume control valve.

EVAP Canister Purge Control Valve
Check EVAP canister purge control valve as follows:
1. Blow air in port (A), (B) and (C) then ensure that there is no leakage.




2. Apply vacuum to port (A). [Approximately -13.3 to -20.0 kPa (-100 to -150 mmHg, -3.94 to -5.91 inHg)]
Blow air in port (C) and ensure free flow out of port (B).

EVAP Canister Purge Control Solenoid Valve




Check air passage continuity.




If NG replace solenoid valve.

EVAP Control System Pressure Sensor
1. Remove EVAP control system pressure sensor from bracket with its harness connector connected.
2. Remove hose from EVAP control system pressure sensor.




3. Apply vacuum and pressure to EVAP control system pressure sensor with pump as shown in figure.
4. Check output voltage between terminal (2) and engine ground.

Pressure (Relative to atmospheric pressure) / Voltage (V)
+4.O kPa (+30 mmHg, +1.18 inHg) / Approximately 4.6
9.3 kPa (-70 mmHg. -2.76 inHg) / Approximately 0.5

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

5. If NG, replace EVAP control system pressure sensor.

Absolute Pressure Sensor
1. Remove absolute pressure sensor from bracket with its harness connector connected.
2. Remove hose from absolute pressure sensor.




3. Apply vacuum and pressure to absolute pressure sensor as shown in figure.
4. Check output voltage between terminal (2) and engine ground.

Pressure (Absolute pressure) / Voltage (V)
106.6 kPa (800 mmHg, 31.50 inHg) / Approximately 4.6
13.3 kPa (100 mmHg, 3.94 inHg) / Approximately 0.5

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 SWN" in "ACTIVE TEST" mode with CONSULT.
3. Make sure of the following.




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




- When selecting "BARO", "ABSOL PRES/SE" indicates approximately 4.3V.
4. If NG, check solenoid valve below.

OR

Without Consult
1. Remove MAP/BARO switch solenoid valve.




2. Check air passage continuity.




3. If NG, replace solenoid valve.




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