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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0172: Fuel Trim System Rich - Bank 1; DTC P0175: Fuel Trim System Rich - Bank 2 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM TESTS. After performing powertrain diagnostic system check, go to next step.
    NOTE: If other DTCs are present, except P0172 or P0175, diagnose those DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  2. Start engine and run to normal operating temperature. Ensure system is in closed-loop operation. Using scan tool, record long term fuel trim data. Turn engine off. Turn ignition on. Using scan tool, review FREEZE FRAME and/or FAILURE RECORDS data and record displayed data for DTC. If long term fuel trim is more than -13 percent, go to DIAGNOSTIC AIDS . If long term fuel trim is less than -13 percent, go to next step.
  3. Start engine and allow to idle. Observe suspect HO2S using scan tool. If HO2S reading is fluctuating between 200 mV and 800 mV, go to next step. If HO2S reading is not fluctuating or not between 200 mV and 800 mV, go to step  5.
  4. Turn engine off. Visually check for blocked MAF sensor screen, damaged or improperly routed/connected vacuum hoses. Collapsed or restricted air intake duct or restricted air filter. Repair condition as necessary. After repairs, go to step  7. If conditions are not found, go to step  6.
  5. Turn engine off. Check for proper installation of suspect HO2S. Ensure HO2S harness is not contacting exhaust system. Check for short between HO2S wires. Repair as necessary. After repairs, go to step  7. If conditions are not found, diagnose fuel system. See appropriate SYSTEM & COMPONENT TESTING article.
  6. Check for the following conditions:
    • Excessive fuel contamination of engine oil.
    • Malfunctioning EVAP system.
    • Malfunctioning fuel pressure regulator.
    • Malfunctioning fuel injector(s).

    Using scan tool, perform fuel injector balance test. Repair as necessary. After repairs, go to next step. If conditions are not found, diagnose engine mechanical condition. Repair engine mechanical condition as necessary.

  7. Using scan tool, clear DTCs. Turn ignition off for at least 30 seconds. Start engine and allow it to reach normal operating temperature. 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.
  8. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no undiagnosed DTCs are displayed, system is okay.
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