DTC 1008
SYSTEM DESCRIPTION
This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass passage in the EVAP canister purge volume control valve changes to control the flow rate. A built-in step motor moves the valve in steps corresponding to the ECM output pulses. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the airflow changes.
COMPONENT DESCRIPTION
The EVAP canister purge volume control valve uses a step motor to control the flow rate of fuel vapor from the EVAP canister. This motor has four winding phases. It operates according to the output pulse signal of the ECM. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECM does not issue the pulse signal. A certain voltage signal is issued so that the valve remains at that particular opening.
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 3" with GST
OR
WITH NO TOOLS
(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) 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 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 50 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
WITH 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 50 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
WITH 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 (51) 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 50 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 (51) and ground:
More than 0.8V
(6) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(7) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
EC-PGC/V-01 Evaporative Emission (EVAP) Canister Purge Volume Control Valve (DTC: 1008):
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 3O 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 CONT/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
WITH NO TOOLS
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 3O 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". 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.