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Home >> Isuzu >> 2000 >> Rodeo LSE, 2.2 D >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Trouble Code Identification >> DTC P1171: Fuel System Lean During Acceleration >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. If any other component-related DTCs are set, fix those DTCs first. If no other DTC is present, go to next step.
  3. Check fuel level. Add fuel if tank is almost empty. If fuel was added, go to next step. If no additional fuel was required, go to step  5.
  4. Start vehicle and bring engine to normal operating temperature of 167-203°F (75-95°C). Increase engine speed to 1200 RPM and use scan tool to observe HO2S-1 voltage. If scan tool reading toggles between .1 and .9 volt, see FUEL SYSTEM DIAGNOSIS under TROUBLE SHOOTING in BASIC DIAGNOSTIC PROCEDURES article. If voltage is not as specified, go to next step.
  5. Turn ignition off. Disconnect fuel pump relay. Crank engine to relieve fuel pressure. Install fuel pressure gauge. Reinstall fuel pump relay. Start engine, bring to normal operating temperature and allow it to idle. Disconnect vacuum line going to fuel pressure regulator and read pressure gauge. If pressure is 41-47 psi (2.9-3.3 kg/cm2 ), see On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. If pressure reading is not as specified, go to next step.
  6. Check for restricted fuel lines or filter. If problem is found, repair problem. Retest system. If no problem is found, go to next step.
  7. Turn ignition on, engine off. Using scan tool, turn on fuel pump. With fuel pressure gauge still connected, pinch off fuel return line, not allowing fuel pressure to exceed 60 psi (4.2 kg/cm2 ). Manipulate fuel line to increase pressure to greater than 47 psi (3.3 kg/cm2 ). If pressure increases to greater than specification, go to DIAGNOSTIC AIDS . If pressure does not rise to greater than specification, go to next step.
  8. Check for faulty fuel pump, restricted fuel pump strainer, incorrect fuel pump, incorrect fuel being used or hot fuel. If any problem is found, repair as necessary. Retest system.
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