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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport and 2002 Isuzu Rodeo. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD-II system check, go to next step.
  2. If DTC P0461, P0462 or P0463 is set, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If specified DTCs are not set, go to next step.
  3. Using scan tool, select EVAPORATIVE SYSTEMS TEST  under MISCELLANEOUS TESTS. From scan tool, command EVAP canister purge control valve and vent solenoid On and Off. Ensure purge valve and vent solenoid click audibly when commanded on and off with scan tool. If click is heard, go to next step. If no click is heard, inspect components and verify PCM output signal to each component. See appropriate pin voltage chart in PIN VOLTAGE CHARTS article.
  4. Turn ignition off. Remove fuel cap. Turn ignition on. Using scan tool, observe FUEL TANK PRESSURE voltage parameter. If parameter is 1.51 volts, go to step  7 . If parameter is not as specified, go to next step.
  5. If battery has been disconnected, perform a visual and physical inspection of EVAP system. See EVAPORATIVE EMISSION SYSTEM in SYSTEM & COMPONENT TESTING article. If battery was not disconnected, go to next step.
  6. Disconnect battery. Wait at least 20 seconds, and reconnect battery. Repeat test starting in step  4 .
    7. NOTE: Calibrate EVAP pressure/vacuum gauges on EVAP pressure/purge testing cart (J41413) or equivalent before proceeding. See manufacturer's operating instructions.
  7. Install fuel cap. Using scan tool, select EVAPORATIVE SYSTEMS TEST  under MISCELLANEOUS TESTS. From scan tool, command EVAP vent solenoid On (closed). From EVAP pressure/purge testing cart, connect EVAP pressure/vacuum gauge to EVAP service port. Using EVAP pressure/purge testing cart, attempt to pressurize EVAP system to 15 in. H2 O. Turn switch on EVAP pressure/purge testing cart to HOLD. On scan tool observe FUEL TANK PRESSURE parameter. FUEL TANK PRESSURE parameter should maintain a pressure of 3-7 in. H2 O. If pressure is maintained, go to next step. If pressure cannot be maintained, check EVAP system. See EVAPORATIVE EMISSION SYSTEM in SYSTEM & COMPONENT TESTING article.
    8. NOTE: Review temperature variation instructions included with EVAP Diagnostic Station pressure and vacuum gauge operating instructions before proceeding.
  8. Turn ignition on. Using scan tool, command EVAP vent solenoid On (closed). Connect EVAP pressure/vacuum gauge to EVAP service port. Using EVAP pressure/purge testing cart attempt to pressurize EVAP system to 15 in. H2 O. Rotate switch on EVAP Diagnostic Station to HOLD position. On scan tool observe FUEL TANK PRESSURE voltage parameter. If voltage decreases to between 1.47-1.51 volts within 2 minutes, go to next step. If voltage does not decrease as specified, check for intermittent problem. See DIAGNOSTIC AIDS  .
  9. Disconnect fuel tank vapor line and EVAP purge line from EVAP canister. EVAP canister is located on frame rail, under vehicle. Block canister fitting for fuel tank vapor line. Connect a hand vacuum pump to canister fitting for EVAP purge line. Ensure EVAP vent solenoid is still commanded On (closed). Apply 5 in. Hg to EVAP canister. If vacuum can be maintained, go to step  12 . If vacuum cannot be maintained, go to next step.
  10. Perform a visual and physical inspection of EVAP system. Check for damaged or disconnected fuel tank vapor lines or hoses and EVAP canister. If problem is found, repair as necessary. After repair, go to step  14 . If no problems were found, go to next step.
  11. Replace EVAP vent solenoid. After repair, go to step  14 .
  12. Perform a visual and physical inspection of EVAP system. Check for missing, damaged or defective gas cap, vapor lines or EVAP purge line. If problem is found, repair as necessary. After repair, go to step  14 . If no problem was found, go to next step.
  13. Using scan tool, command EVAP vent solenoid On. Using EVAP pressure/purge testing cart attempt to pressurize EVAP system. Turn EVAP service cart pressure knob in pressurized position. Using ultrasonic leak detector, locate and repair any leaks in EVAP system (it may be necessary to partially lower fuel tank to locate leaks). If problem is found, repair as necessary. After repair, go to next step.
    14. NOTE: Review temperature variation instructions included with EVAP Diagnostic Station pressure and vacuum gauge operating instructions before proceeding.
  14. Turn ignition on. Using scan tool, command EVAP vent solenoid On (closed). Connect EVAP pressure/vacuum gauge to EVAP service port. Using EVAP pressure/purge testing cart attempt to pressurize EVAP system to 15 in. H2 O. Rotate switch on EVAP Diagnostic Station to hold position. On scan tool observe FUEL TANK PRESSURE voltage parameter. If voltage decreases to less than 2.14 volts within 2 minutes, system is okay. If voltage does not decrease as specified, repeat test starting in step  3 .
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