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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 P0172: Fuel Trim System Rich - Bank 1 >> 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 P0175, diagnose affected DTCs first.
  2. Start and warm engine to normal operating temperature. Ensure system is in closed-loop operation. Using scan tool, select FUEL TRIM DATA LIST and monitor LT FT BN 1. If LT FT is greater than -13 percent, go to next step. If LT FT is not greater than -13 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 P0175 is also present, go to next step. If DTC P0175 is not present, go to step  6.
  5. Check for collapsed air intake duct, restricted fuel filter, improperly installed MAF sensor, foreign objects in MAF sensor inlet or for fuel in fuel regulator hose. Repair as necessary. After repairs, go to step  7. If components are okay, or repair is not necessary, diagnose fuel system. See appropriate BASIC DIAGNOSTIC PROCEDURES article.
  6. Check for leaking fuel injectors in Bank 1. Repair or replace as necessary. After repairs, go to step  9. If injectors are okay, go to step  8.
  7. Replace or repair affected components. After repairs, go to step  9.
  8. Replace faulty HO2S. After replacing sensor, go to next step.
  9. 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 that set 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.
  10. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no undiagnosed DTCs are displayed, system is okay.
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