Diagnostic Procedures: / Connecting the Vehicle to Hds:

To make your HDS screen appear like Graph # 1, follow the steps outlined below:

1. Connect HDS to the vehicle, enter "Simu-Tech", then select "Signal Waveforms".

2. At the signal selection screen, select "ORDER", and then select "BY NAME". Then select "Canister Close Valve", "Canister Purge Solenoid", and "Differential Pressure Sensor".

3. Select "OPTIONS", and select "ANALOG RECORD".

4. Select "CTRL" (control), select "MS/DIV", and then select "300 ms/div".

5. Select "OK", then select "RUN".

6. Start the vehicle and look at your watch (the self check occurs 16 minutes after start-up).

7. After start-up, verify that the voltage for the canister close valve and canister purge valve is approximately 13.5 volts, and the DPS reads approximately 1.6 - 2.7 volts depending how recently the purge control solenoid was last activated.

8. After 15 minutes, begin watching the "CAN CLOS" (Canister Close Valve) signal.

9. As soon as the canister close valve voltage drops to near zero, count to 39 seconds and then touch the screen to stop recording.

10. Select "OPTIONS", then "DATA PLAYBACK".

11. Select "ZOOM", then select "-32". The screen will now look like the system plot in this TSB. You may have to select "SCROLL" and then choose "FORWARD" or "BACKWARD" to get the data onto your screen.