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Home >> Pontiac >> 2007 >> Vibe Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - DTC P2195 To DTC P2A00 >> DTC P2401 >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  If you had DTC P2419 set with DTC P2401, go perform the P2419 diagnostic procedure before continuing in this diagnostic table. If you are at this diagnostic table because you were sent here from DTC P2419, go to Step 7. If only DTC P2401 was set, also go to Step 7.
  2. 11:  This step uses the EVAP Service Bay test in order to verify the correct operation of the EVAP vent solenoid, the EVAP purge solenoid, and the EVAP vacuum leak pump. Using the Service Bay test also tests for leaks by sealing the system and monitoring the FTP sensor.
DTC P2401

Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Powertrain Control Module Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Disconnect the electrical connector of the evaporative emission (EVAP) vacuum leak pump assembly.
  4. Connect a test lamp across the vacuum leak pump control circuit and ground circuit.
  5. Command the EVAP vacuum leak pump ON with the scan tool. Refer to Scan Tool Output Controls .
Did the test lamp illuminate?		 Go to Step 3  Go to Step 4 
3  If a DTC P2419 was also set, did you already perform the P2419 diagnostic procedure? Go to Step 7  Go to DTC P2419 
4 Connect a test lamp to B+ and the vacuum pump ground circuit.
Does the test lamp illuminate?		 Go to Step 5  Go to Step 6 
5
  1. Test for open or short in the vacuum pump control circuit.
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 9 
6 Repair the open in the vacuum pump ground circuit. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 11  -
7
  1. Test for intermittent and for poor electrical connection at the EVAP vacuum leak pump. Refer to Testing for Intermittent Conditions and Poor Connections .
  2. Repair as necessary. Refer to Wiring Repairs and Connector Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 8 
8 Replace the EVAP vacuum leak pump assembly. Refer to Evaporative Emission System Vacuum Leak Pump Replacement .
Did you complete the replacement?		 Go to Step 11  -
9
  1. Test for intermittent and for poor electrical connections at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections .
  2. Repair as necessary. Refer to Wiring Repairs and Connector Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 10 
10 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 11  -
11 
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF.
  4. Perform the EVAP service bay test with the scan tool. Refer to Service Bay Test .
Is DTC P2401 set in Last Test Failed?		 Go to Step 2  Go to Step 12 
12
  1. Check for other EVAP DTCs in Last Test Failed.
  2. Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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