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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0174: Fuel Trim System Lean - Bank 2 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
    NOTE: If other DTCs are present, except for P0171 and P0174, diagnose the other DTCs first.
  2. Start and warm engine to normal operating temperature. Ensure system is in closed-loop. Using scan tool, select FUEL TRIM DATA LIST and monitor LT FT BN 2. If LT FT BN 2 is less than 23 percent, go to next step. If displayed value is not less than 23 percent, go to step  4.
  3. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME and/or FAILURE RECORDS data and note parameters. Turn ignition off for about 15 seconds. Start engine and operate vehicle within conditions required for this diagnostic to run, and as close to conditions recorded in FREEZE FRAME/FAILURE RECORDS as possible. Select DTC function, and then enter this DTC. If scan tool indicates that this test failed this ignition, go to next step. If scan tool does not indicate that this test failed this ignition, see DIAGNOSTIC AIDS .
  4. If DTC P0171 is also present, go to next step. If DTC P0171 is not present, go to step  6.
  5. Check vacuum hoses for splits, kinks and proper routing. Check for vacuum leaks at throttle body, intake manifold, EGR valve or MAF sensor. Check for fuel contamination. Check for engine mechanical failure. Repair problem as necessary. After repairs, go to step  7. If problem is not found or repair is not necessary, diagnose fuel system. See appropriate SYSTEM & COMPONENT TESTING article.
  6. Inspect bank 2 for exhaust leaks, missing or loose hardware. Check if bank 2 HO2S is installed properly and if connectors are secured. Check vacuum leaks that will only affect bank 1. Check engine mechanical condition. Repair problem as necessary. After repairs, go to next step. If problem is not found or repair is not necessary, diagnose fuel system. See appropriate SYSTEM & COMPONENT TESTING article.
  7. Repair or replace affected faulty components. After repairs or replacement, go to next step.
  8. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, and then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  9. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTCs are displayed, system is okay.
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