Computer is not getting current through the purge valve/solenoid. Check connection to valve. If good, you can either test the valve to see if it's bad (requires special equipment) or just replace the valve. Instructions for both are pasted below. The cost of the part is $40. Let me know if you have more questions.
COMPONENT TESTING
Carefully check for cracks or leaks in the vacuum lines or in the canister itself. The lines and fittings can be reached without removing the canister. Cracks or leaks in the system may cause poor idle, stalling, poor driveability, fuel loss or a fuel vapor odor.
Vapor odor and fuel loss may also be caused by: fuel leaking from the lines, tank or injectors, loose, disconnected or kinked lines, or an improperly seated air cleaner and gasket.
If the system passes the visual inspection and a problem is still suspected, proceed as follows:
- With the ignition switch in the OFF position, unplug the electrical connector from the canister purge solenoid. Use an ohmmeter to check the solenoid coil resistance; it should be 19-31 ohms.
- Turn the ignition switch ON then, disconnect the vacuum line from the intake manifold and connect a hand vacuum pump to the valve.
- Apply a vacuum of about 10 in. Hg (34 kPa) to the hose and solenoid, then observe if the valve holds the vacuum. If the valve does not hold, apply vacuum directly to the solenoid to determine if the solenoid or hose is at fault, then replace the component which allowed vacuum to release.
- If the vacuum holds in the initial test, jumper the test terminals on the ALDL (terminals A and B are the test terminals and are the two uppermost right terminals of the ALDL connector), and observe if the valve activates, releasing the vacuum. If the valve does not activate and release the vacuum, replace the solenoid.
REMOVAL & INSTALLATION
Canister Purge Solenoid Valve
See Figure 2
The purge solenoid valve is mounted on the engine, towards the rear and below the intake manifold.
- As an added safety precaution, you may wish to disable the air bag(s), if equipped. refer to Chassis Electrical for the air bag disabling procedure.
- Disconnect the negative battery cable.
- Remove the air cleaner/intake tube assembly.
For DOHC engines, the solenoid can be reached through the access hole located next to the intake manifold support bracket.
- Unplug the solenoid vacuum hoses and electrical connector.
- Remove the attaching bolt, then remove the canister purge solenoid.
To install:
- Install the solenoid and tighten the retaining bolt to 19 ft. lbs. (25 Nm).
- Connect the vacuum lines to the solenoid, then install and push in the electrical connector until it clicks firmly into place.
- Install the air cleaner/intake tube assembly.
- Connect the negative battery cable.
- If necessary, enable the air bag(s). refer to Chassis Electrical .
Fig. Fig. 2: The canister purge solenoid is mounted below the intake manifold 
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