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Home >> Infiniti >> 1996 >> I30 V6-2988cc 3.0L DOHC (VQ30DE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Engine Control System >> Code 1008

Code 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.




DIAGNOSTIC CHART




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
CONSULT
1) Turn ignition switch "ON".
2) Select "DATA MONITOR" mode with CONSULT.
3) Start engine and wait for at least 3 seconds.

OR

GST
1) Start engine and wait for at least 3 seconds.
2) Select "MODE 3" with GST.

OR

NO TOOLS
1) Start engine and wait for at least 3 seconds.
2) Turn ignition switch "OFF". Wait for at least 5 seconds and then turn "ON" again.
3) Perform Diagnostic Test Mode II (Self-diagnostic results) with ECM.

Procedure for malfunction B
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 until the engine coolant temperature rises to 60 to 80°C (140 to 176°F), then stop engine. (If the engine coolant temperature exceeds the above range, stop engine and wait until the temperature falls to within this range.)
4) Start engine and let it idle for at least 70 seconds.
5) Maintain the following conditions for at least 10 seconds.

Gear position:
"2" or "D" range (A/T)
"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

GST
1) Jack up drive wheels.
2) Turn ignition switch "ON" and select "MODE 1" mode with GST.




3) Start engine and warm it up until the engine coolant temperature rises to 60 to 80°C (140 to 176°F), then stop engine. (If the engine coolant temperature exceeds the above range, stop engine and wait until the temperature falls to within this range.)
4) Start engine and let it idle for at least 70 seconds.
5) Maintain the following conditions for at least 10 seconds.

Gear position:
"2" or "D" range (A/T)
"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)

6) 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 until the voltage between ECM terminal (59) and ground drops to 1.2 - 1.9V, then stop engine. (If the voltage drops below the above range, stop engine and wait until the voltage rises to within this range.)
4) Start engine and let it idle for at least 70 seconds.
5) Maintain the following conditions for at least 10 seconds.

Gear position:
"2" or "D" range (A/T)
"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

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

COMPONENT INSPECTION
CONSULT
EVAP canister purge volume control valve
1. Disconnect EVAP canister purge volume control valve harness connector.







2. Check resistance between the following terminals.
terminal (2) and terminals (1),
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 CONTIV" 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

NO TOOLS
1. Disconnect EVAP canister purge volume control valve harness connector.
2. Check resistance between the following terminals.
terminal (2) and terminals (1),
terminal (5) and terminals (4),

Resistance: Approximately 30ohms 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.




WIRING DIAGRAM


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