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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 108 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P1441: EVAP System Flow During Non-Purge (SOHC) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Pontiac Sunfire, 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Are DTCs P0443, P0449, P0452 or P0453 also set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  3. Turn ignition on, with engine off. With a scan tool, monitor the FTP. Does the scan tool indicate FTP outside the specified value of -0.5 to 0.5 in. H2O? If yes, go to next step. If no, go to step  5.
  4. With a scan tool, monitor the FTP voltage. Does the scan tool indicate that the FTP voltage is more than 4.3 volts? If yes, go to DTC P0453: FUEL TANK PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE . If no, go to step  6.
  5. Disconnect purge pipe from the EVAP canister purge valve. Install a hand-held vacuum gauge to EVAP canister purge valve purge port. Disconnect EVAP canister purge valve harness connector. Monitor vacuum on vacuum gauge. Start and allow engine to idle. Increase engine speed to 1200-1500 RPM. Does the vacuum gauge indicate an increase in vacuum? If yes, go to step  7. If no, go to DIAGNOSTIC AIDS .
  6. Replace FTP sensor. When complete, go to step  8.
  7. Replace EVAP canister purge valve. When complete, go to next step.
  8. Use scan tool to clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within Conditions for Running DTC. See CONDITIONS FOR RUNNING DTC . Does DTC run and pass? If yes, go to next step. If no, go to step  3.
  9. With a scan tool, observe the stored information, Capture Info. Does scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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