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Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic II (OBD-II) system check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. Install Tech 2 scan tool. Check for other DTCs. If DTC(s) P0452, P0453, P0461, P0462 or P0463 is also set, go to those DTC(s) in numerical order before proceeding. See DTC P0452: FUEL TANK PRESSURE SENSOR LOW VOLTAGE , DTC P0453: FUEL TANK PRESSURE SENSOR HIGH VOLTAGE , DTC P0461: FUEL LEVEL SENSOR CIRCUIT , DTC P0462: FUEL LEVEL SENSOR CIRCUIT LOW VOLTAGE  or DTC P0463: FUEL LEVEL SENSOR CIRCUIT HIGH VOLTAGE  . If other DTC(s) do not exist, go to next step.
  3. Check fuel cap for missing or loose condition. If problem is found, repair as necessary. After repairs, go to step  18. If repair is not necessary, go to next step.
  4. Turn ignition on, with engine off. Using scan tool, command EVAP canister purge valve and EVAP vent solenoid on and off. If purge valve and vent solenoid click, go to next step. If purge valve and/or vent solenoid do not click, go to PCM OUTPUTS DIAGNOSIS .
  5. Turn ignition off. Remove fuel filler cap. Turn ignition on. Observe fuel pressure value on scan tool. If fuel tank pressure is zero in. Hg, go to next step. If fuel tank pressure is not as specified, go to DTC P0452: FUEL TANK PRESSURE SENSOR LOW VOLTAGE  or DTC P0453: FUEL TANK PRESSURE SENSOR HIGH VOLTAGE  .
  6. Reinstall fuel cap. Using scan tool, command EVAP vent solenoid on (closed). Zero EVAP pressure and vacuum gauges on EVAP Pressure/Purge Cart (J-41413). Connect EVAP pressure/purge cart to EVAP service port. Attempt to pressurize EVAP system to 5 in. H2 O. Monitor pressure using gauge on EVAP pressure/purge cart. If pressure can be achieved, go to next step. If pressure cannot be achieved, go to step  8.
  7. Maintain fuel tank pressure at 12 mm Hg. Using scan tool, observe FUEL TANK VACUUM PRESSURE. If indicated pressure is 7.2-16.8 mm Hg, go to step  10. If indicated pressure is not 7.2-16.8 mm Hg, go to step  9.
  8. Disconnect fuel tank vapor and EVAP purge hoses from EVAP canister. Plug canister fitting for fuel tank vapor hose. Ensure EVAP vent solenoid is still commanded on. Connect a hand-held vacuum pump to EVAP purge hose fitting on EVAP canister. Apply 5 in. Hg. If vacuum holds, go to step  13. If vacuum does not hold, go to step  12.
  9. Check for restricted fuel tank vapor and EVAP purge hoses. Repair as necessary. After repair is completed, go to step  18. If hoses are okay, go DTC P0452: FUEL TANK PRESSURE SENSOR LOW VOLTAGE  or DTC P0453: FUEL TANK PRESSURE SENSOR HIGH VOLTAGE  .
  10. Disconnect throttle body vacuum supply hose at EVAP canister purge valve. Connect a hand-held vacuum pump to EVAP canister purge valve vacuum source fitting. Apply vacuum to 10 in. Hg. Using scan tool, command EVAP canister purge valve on. If vacuum is released, go to next step. If vacuum holds, go to step  15.
  11. Connect a vacuum gauge to EVAP canister purge valve vacuum supply hose (from throttle body). Start engine. Increase engine speed to 2500 RPM. If vacuum is greater than 10 in. Hg, see DIAGNOSTIC AIDS . If vacuum is less than 10 in. Hg, go to step  16.
  12. Cted, go to step  18. If no problem is found, go to step  17.
  13. Check for missing or faulty fuel cap. Check for disconnected or leaking fuel tank vapor hose or disconnected or damaged EVAP purge hose. Also check quick-connect "O" rings for EVAP line connections. Repair as necessary. After repairs, go to step  18. If no problem is found, go to next step.
  14. Reconnect all EVAP components previously disconnected. Using scan tool, command EVAP vent solenoid on. With EVAP pressure/purge cart connected to EVAP service port, attempt to pressurize EVAP system by leaving cart control knob in PRESSURIZE position. Using Ultrasonic Leak Detector (J-41416), locate and repair EVAP system leak. It may be necessary to partially lower fuel tank to examine hose connections at top of tank. After repair is completed, go to step  18.
  15. Replace EVAP canister purge valve. After repair is completed, go to step  18.
  16. Locate and repair cause of low or no vacuum. After repair is completed, go to step  18.
  17. Replace EVAP vent solenoid. After repair, go to next step.
  18. Reconnect all EVAP components previously disconnected. Turn ignition on, with engine off. Using scan tool, command EVAP vent solenoid on (closed). Using EVAP pressure/purge cart, pressurize EVAP system to 15 in. H2 O. Set rotary switch on pressure/purge cart to HOLD, and observe EVAP pressure gauge. If pressure decreases to less than 10 in. H2 O within 2 minutes, go to step  3. If pressure does not decrease to less than 10 in. H2 O within 2 minutes, go to next step.
  19. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0440. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool did not indicate that this test ran and passed, repeat step  2.
  20. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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