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Home >> Chevrolet >> 2001 >> Cavalier LS, 2.2 4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Engine Controls Self-Diagnostics - 2.4L) >> Diagnostic Tests >> DTC P1171: Fuel System Lean During Acceleration >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Turn ignition on, with engine off. Install a scan tool. Are any component related DTCs set? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, go to next step.
  3. Check the vehicle for an adequate amount of fuel. Add fuel if tank is almost empty. Was it necessary to add fuel? If yes, go to step  5 . If no, go to next step.
  4. Start the engine. Run the engine at 1200 RPM and warm to 167-203°F (75-95°C). Observe the O2S 1 voltage with the scan tool. The O2S 1 voltage should vary from 100-900 millivolts and occasionally toggle to greater than 447 millivolts from the specified voltage of 100-900 mV. Does the O2S 1 toggle? If yes, diagnose fuel system. If no, go to DTC P0134: HO2S CIRCUIT INSUFFICIENT ACTIVITY  .
  5. Use the scan tool in order to clear the DTCs. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC  . Does the DTC run and pass? If yes, go to next step. If no, go to step  2 .
  6. Using scan tool, observe stored information and Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, system is okay.
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