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Home >> Nissan-Datsun >> 1997 >> Maxima SE V6-2968cc 3.0L DOHC MFI (VQ30DE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Engine Control System >> With MIL Indicator Lamp >> DTC 1008

DTC 1008




SYSTEM DESCRIPTION
This system automatically controls flow rate of fuel vapor from EVAP canister. The EVAP canister purge volume control valve changes the opening of the vapor by-pass passage to control the flow rate. This valve is actuated by a step motor built into the valve, which moves the valve in the axial direction in steps corresponding to the ECM output pulses, the opening of the valve is varied to allow for optimum engine control. The optimum value stored in the ECM is determined by taking into consideration various engine conditions. When the engine operates, the flow rate is proportionally regulated as the air flow increases.




COMPONENT DESCRIPTION
The EVAP canister purge volume control valve is operated by a step motor for control of flow rate of fuel vapor from EVAP canister. This motor has four winding phases and is actuated by the output pulse signal of ECM which turns ON and OFF two windings each in sequence. Each time the valve opens or closes to change the flow rate, an ON pulse is issued. When no change in the flow rate is needed, the valve remains at a certain opening, hence no pulse signal output is issued.




CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.




ECM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values, and are measured between each terminal and (25) (ECCS ground) with a voltmeter.




ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Perform "Procedure for malfunction A" first. If the DTC cannot be confirmed, perform "Procedure for malfunction B".

Procedure for Malfunction A
With Consult
(1) Jack up drive wheels.
(2) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
(3) Start engine and let it idle for at least 90 seconds.
(4) Move selector/gearshift lever to 1" range (A/T) or "1st" gear (M/T).
(5) Race engine from idle to 2,000 to 3,000 rpm more than 10 times.

OR

With GST
(1) Jack up drive wheels.
(2) Start engine and let it idle for at least 90 seconds.
(3) Move selector/gearshift lever to "1 " range (A/T) or "1st" gear (M/T).
(4) Race engine from idle to 2,000 to 3,000 rpm more than 10 times.
(5) Select "MODE 7" with GST.

OR

No Tools
(1) Jack up drive OR wheels.
(2) Start engine and let it idle for at least 90 seconds.
(3) Move selector/gearshift lever to "1" range (A/T) or "1st" gear (M/T).
(4) Race engine from idle to 2,000 to 3,000 rpm more than 10 times.
(5) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(6) Perform Diagnostic Test Mode II (Self-diagnostic results) with ECM.

Procedure for Malfunction B
With Consult
(1) Jack up drive wheels.




(2) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
(3) Start engine and warm it up sufficiently.
(4) Check that tank fuel temperature is above 0°C (32°F).
(5) Turn ignition switch "OFF" and wait at least 5 seconds.
(6) Start engine and let it idle at least 70 seconds.
(7) Maintain the following conditions at least 10 seconds.

Gear position:
"2" or "D" range (Art)
"3rd" or "4th" gear (M/T)

Vehicle speed: 40 - 80 km/h (25 - 50 MPH)
Engine speed: 1,500 - 2,500 rpm
Coolant temperature: Less than 100°C (212°F)

OR

With GST
(1) Jack up drive wheels.




(2) Turn ignition switch "ON" and select "MODE 1" with GST.
(3) Start engine and warm it up sufficiently.
(4) Check that voltage between ECM terminal (52) and ground is less than 4.2V.
(5) Turn ignition switch "OFF" and wait at least 5 seconds.
(6) Start engine and let it idle at least 70 seconds.
(7) Maintain the following conditions at least 10 seconds.

Gear position:
2" or "D" range (An)
"3rd" or "4th" gear (M/T)

Vehicle speed: 40 - 80 km/h (25 - 50 MPH)
Engine speed: 1,500 - 2,500 rpm
Coolant temperature: Less than 100°C (212°F)

(8) Select "MODE 3" with GST.

OR

No Tools
(1) Jack up drive wheels.
(2) Turn ignition switch "ON".
(3) Start engine and warm it up sufficiently.




(4) Check that voltage between ECM terminal (52) and ground is less than 4.2V.
(5) Turn ignition switch "OFF" and wait at least 5 seconds.
(6) Start engine and let it idle at least 70 seconds.
(7) Maintain the following conditions at least 10 seconds.

Gear position:
"2" or "D" range (An)
"3rd" or "4th" gear (M/T)

Vehicle speed: 40 - 80 km/h (25 - 50 MPH)
Engine speed: 1,500 - 2,500 rpm




Voltage between ECM terminal (59) and ground: More than 0.8V

(8) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(9) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

EC-PGC/V-01 Evaporative Emission (EVAP) Canister Purge Volume Control Valve (DTC: P1445):




WIRING DIAGRAM




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 "PURO VOL CONT/V" 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.

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