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DTC Troubleshooting

DIAGNOSIS PROCEDURE - DTC P0448 EVAP VENT CONTROL CIRCUIT SHORTED

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD) System Check.
Is the system check complete?		 - Go to Step 2. Go to "ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK ".
2
  1. Turn ON the ignition, with the engine OFF.
  2. Command the evaporative emission EVAP vent solenoid ON and OFF with a scan tool.

Do you hear or feel a click from the EVAP vent solenoid when the solenoid is commanded ON and OFF?		 - Go to Step 3. Go to Step 4.
3
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 90 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?		 - Go to Step 4. Go to "DIAGNOSTIC AIDS ".
4
  1. Turn OFF the ignition.
  2. Disconnect the EVAP vent solenoid.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage on the EVAP vent solenoid control circuit.

Is the voltage above the specified value?		 6.6 V Go to Step 5. Go to Step 6.
5 Test the control circuit of the EVAP vent solenoid for a short to voltage.
Did you find and correct the condition?		 - Go to Step 10. Go to Step 7.
6 Test for an intermittent and for a poor connection at the EVAP vent solenoid.
Did you find and correct the condition?		 - Go to Step 10. Go to Step 8.
7 Test for an intermittent and for a poor connection at the control module.
Did you find and correct the condition?		 - Go to Step 10. Go to Step 9.
8 Replace the EVAP vent solenoid.
Did you complete the replacement?		 - Go to Step 10. -
9 Replace the control module.
Did you complete the replacement?		 - Go to Step 10. -
10
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 90 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?		 - Go to Step 2. Go to Step 11.
11 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to applicable DTC TABLE . System OK
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