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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 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 voltage parameter. FUEL TANK PRESSURE voltage parameter should be 1.52-1.69 volts. If voltage parameter is as specified, leave EVAP pressure/purge testing cart connected to vehicle and go to next step. If voltage parameter is not as specified, check EVAP system. See EVAPORATIVE EMISSION SYSTEM in SYSTEM & COMPONENT TESTING article.
  8. Maintain EVAP system at 15 in. H2 O. Using scan tool, command EVAP vent solenoid Off (open) while observing EVAP pressure gauge on service cart. EVAP system pressure should drop to zero in. H2 O within 5 seconds. If EVAP pressure react as specified, check for intermittent problem. See DIAGNOSTIC AIDS  . If EVAP pressure does not react as specified, leave EVAP pressure/purge testing cart connected to vehicle and go to next step.
  9. Disconnect large vent hose (marked AIR) from EVAP canister. EVAP canister is located on frame rail, under vehicle. Switch rotary switch on EVAP pressure/purge testing cart to PURGE. Start engine and run until engine is at normal operating temperature of 167-203°F (75-95°C). Observe vacuum gauge on service cart while holding engine sped at 2500 RPM. If vacuum remains lower than 30 in. H2 O, go to next step. If vacuum is not as specified, go to step  12 .
  10. Perform a visual and physical inspection of EVAP system. Check for kinked, pinched or damage to EVAP canister vent hose. If problem is found, repair as necessary. After repair, go to step  13 . If no problem is found, go to next step.
  11. Replace EVAP vent solenoid. After repair, go to step  13 .
  12. Replace EVAP canister. After repair, go to step  13 .
  13. 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 pressurize EVAP system to 15 in. H2 O. Rotate switch on EVAP Diagnostic Station to HOLD position. Using scan tool, command EVAP vent solenoid Off (open). On scan tool observe FUEL TANK PRESSURE voltage parameter. If voltage decreases to 1.51 volts within 5 seconds, system is okay. If voltage is not as specified, repeat test starting in step  3 .
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