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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 SELF-DIAGNOSTICS - INTRODUCTION article. Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Turn ignition off. Remove fuel cap. Turn ignition on. Using scan tool, read FUEL TANK VACUUM. If scan tool displays zero in. H2 O, go to next step. If scan tool does not display zero in. H2 O, repair faulty fuel tank sensor circuit.
  3. Zero pressure and vacuum gauges on EVAP Diagnostic Station (J41413). Reinstall fuel cap. Using scan tool, command EVAP vent solenoid ON (closed). Connect EVAP pressure/purge diagnostic station to EVAP service port. Using EVAP diagnostic station, pressurize EVAP system to 5 in. H2 O. Using scan tool, read FUEL TANK PRESSURE. If scan tool displays 5 in. H2 O, go to next step. If scan tool does not display 5 in. H2 O, check for EVAP system DTCs. If any undiagnosed EVAP system DTCs are displayed, diagnose affected DTCs. Repair EVAP system as necessary. After repair, go to next step. If no EVAP system DTCs were stored, see DIAGNOSTIC AIDS .
  4. Maintain EVAP system pressure at 5 in. H2 O. Using scan tool, command EVAP vent solenoid OFF (open). Monitor EVAP diagnostic station pressure gauge. If pressure decreases to zero in. H2 O within 10 seconds, see DIAGNOSTIC AIDS . If pressure does not decrease as specified, go to next step.
  5. Disconnect vent hose marked AIR, from EVAP canister. Switch EVAP pressure/purge diagnostic station rotary switch to release pressure position. Disconnect vent hose, vapor line and purge line from EVAP canister. Plug vapor line fitting at canister. Connect hand vacuum pump to purge line fitting on canister. Attempt to obtain 5 in. Hg vacuum. If vacuum cannot be obtained, go to next step. If vacuum can be obtained, go to step  11.
  6. Check if vent hose is between EVAP canister and EVAP solenoid is kinked, pinched or blocked. If a problem is found, repair as necessary. After repairs, go to step  13. If no problem is found, go to next step.
  7. Turn ignition off. Disconnect EVAP vent valve harness connector. Turn ignition on, with engine off. Using test light connected to battery voltage, probe EVAP vent solenoid valve harness connector power feed circuit (Pink wire) at harness connector. If test light comes on, go to next step. If test light does not come on, go to step  10.
  8. Turn ignition off. Disconnect VCM Red harness connector. Using test light connected to battery voltage, probe EVAP vent solenoid valve harness connector vent control circuit (White wire) at harness connector. If test light comes on, go to next step. If test light does not come on, go to step  12.
  9. Repair short to ground in EVAP vent control circuit (White wire). After repair, go to step  13.
  10. Replace EVAP vent solenoid valve. After replacing solenoid valve, go to step  13.
  11. Replace EVAP canister. After replacing canister, go to step  13.
  12. Replace VCM. Program replacement VCM. See PROGRAMMING .
  13. Using scan tool, command EVAP vent solenoid ON (closed). With EVAP diagnostic station connected to EVAP service port, pressurize EVAP system to 5 in. H2 O. Switch EVAP pressure/purge diagnostic station rotary switch to HOLD. Using scan tool, command EVAP vent solenoid OFF (open). If pressure decreases to zero in H2 O within 10 seconds, go to next step. If pressure does not decrease as specified, return to step  2.
  14. Using scan tool, select DTC, CLEAR INFO function. Select scan tool function SERVICE BAY TEST for EVAP. Perform any repairs or actions indicated by scan tool. After SERVICE BAY TEST, go to next step.
  15. 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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