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HOMESERVICE MANUALSBUICK2000PARK AVENUE BASE, 3.8 KREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS - 3.8LDIAGNOSTIC TESTSDTC P0175: FUEL TRIM SYSTEM RICH - BANK 2 (CAMARO & FIREBIRD)CIRCUIT DESCRIPTION
2000 Buick Park Avenue Base, 3.8 K

Circuit Description

2000 Buick Park Avenue Base, 3.8 KSECTION Circuit Description

PCM reads HO2S signal voltage and adjust fuel delivery based on this voltage. A change made to fuel delivery is indicated by Long Term (LT) and Short Term (ST) fuel trim values.

ST fuel trim values change rapidly in response to HO2S signal voltages. These changes fine tune engine fueling. LT fuel trim values change in response to trends in ST fuel trim. LT fuel trim makes coarse adjustments to fueling in order to re-center and restore control to ST fuel trim. LT and ST fuel trim can be read by using a scan tool.

Ideal fuel trim value is about zero. Fuel trim value more than zero indicates that PCM is adding fuel to compensate for a lean condition. Fuel trim less than zero indicates that PCM is reducing amount of fuel to compensate for rich condition. DTC will set if PCM detects an excessively rich or lean condition.

For duplication of DTC, ensure:

  • No EVAP system, VSS, EST, misfire, fuel injector circuit, CKP, CMP, TP, MAF, O2, MAP, EGR, ECT or IAT sensor DTCs are set.
  • ECT is 68-230°F (20-110°C).
  • IAT is 0-158°F (-18°C to 70°C).
  • MAP is 15-85 kPa.
  • TP sensor angle is less than 90 percent.
  • Vehicle speed is less than 82 MPH.
  • Engine speed is 600-4000 RPM.
  • BARO is greater than 70 kPa.
  • MAF is 3-150 grams per second.

RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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