Fuel Tank Pressure, Graph Recording Procedure

Fuel Tank Pressure, Graph Recording Procedure




1. After setting up the NGS tester for current vehicle, select DIAGNOSTIC DATA LINK and press TRIGGER.




2. Select PCM - POWERTRAIN CONTROL MODULE and press TRIGGER.




3. Select PID/DATA MONITOR AND RECORD and press TRIGGER.




4. Press Number 5 under CLEAR to clear previously selected PIDs.

NOTE: PID screen will vary with different models.




5. Turn the menu dial clockwise or counterclockwise to highlight CDCV and select by pressing TRIGGER.




6. Turn the menu dial clockwise or counterclockwise to highlight FTP and select by pressing TRIGGER.




7. Push Number 7 under START to view PIDs.




8. When you begin the drive mode, press the TRIGGER to capture the data. Refer to OBD II Drive Mode Procedure.)
Testing and Inspection

NOTE: Watch the CDCV PID. When the evaporative system is tested the display will change from OFF to ON. And when the test is complete the display will change back to OFF.




9. When the monitor changes back to OFF wait a few seconds and press TRIGGER to save the recorded information.
10. Select VIEW RECORDING, then press TRIGGER.




11. Select both PIDs by highlighting and pressing TRIGGER.
12. Press Number 6 under GRAPH.

NOTE: It will be necessary to press Number 8 key to advance the graph to the point where the CDCV is turned on.

Conjecture Of Malfunctioning Parts According To Fuel Tank Pressure Graph Pattern




The malfunction conditions and the malfunctioning parts according to the fuel tank pressure output patterns are as shown.