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HOMESERVICE MANUALSCHEVROLET2000CHEVY EXPRESS G3500, VAN PASSENGER, 7.4 JREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - GASOLINE - 4.3L, 5.0L, 5.7L & 7.4LDIAGNOSTIC TESTSDTC P0175: FUEL TRIM SYSTEM RICH - BANK 2DIAGNOSTIC PROCEDURES
2000 Chevrolet Chevy Express G3500, Van Passenger, 7.4 J

Diagnostic Procedures

2000 Chevrolet Chevy Express G3500, Van Passenger, 7.4 JSECTION Diagnostic Procedures
  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.
    2. NOTE: If any DTCs are present other than DTCs P0172 and P0175, diagnose these DTCs first.
  2. Start engine and let idle in closed loop. Using scan tool, monitor LT fuel trim for bank 2. If value is less than -14 percent, go to next step. If value is not less than -14 percent, go to step  4.
  3. Turn ignition on, with engine off. Review FREEZE FRAME data for this DTC and note parameters. Clear DTCs. Turn ignition off for 15 seconds. Operate vehicle as close to conditions recorded in FREEZE FRAME as possible. Check for DTCs. If DTC P0175 is set, go to next step. If DTC P0175 is not set, see DIAGNOSTIC AIDS .
  4. Check for the following conditions:
    • Air filter plugged or air intake duct collapsed or restricted.
    • Proper MAF sensor installation and inlet screen condition.
    • Throttle body coking or objects blocking IAC passage, if a low or unsteady idle is being experienced.
    • HO2S 1, bank 2 connector and harness routing. Ensure harness does not contact exhaust system.
    • Fuel pressure regulator for proper operation. See BASIC FUEL SYSTEM CHECKS in appropriate BASIC DIAGNOSTIC PROCEDURES article.
    • Excessive fuel in crankcase. Change oil if necessary.

    If a problem is found, go to step  9. If no problem is found, go to next step.

  5. Connect a fuel pressure gauge to fuel rail fitting. Turn ignition off for 10 seconds. Turn A/C off. Turn ignition on. Fuel pump should run for about 2 seconds. It may be necessary to cycle ignition more than once to obtain maximum pressure. Note pressure with pump running. On CSI models, pressure should be 60-66 psi (4.2-4.6 kPa). On SFI models, pressure should be 55-60 psi (3.9-4.2 kPa). On all models, when pump stops, pressure may slightly vary, but should hold steady. If pressure is as specified, go to next step. If pressure is not as specified, go to step  12.
  6. Perform injector balance test. See appropriate SYSTEM & COMPONENT TESTING article. If a problem is found, go to step  10. If no problem is found, go to next step.
  7. Perform diagnostic procedures for DTC P1441. If a problem is found, go to next step. If no problem is found, see DIAGNOSTIC AIDS .
  8. Repair EVAP system. Start engine and let idle in closed loop. Using scan tool, monitor LT fuel trim for bank 2. If value is less than -14 percent, go to step  11. If value is not less than -14 percent, go to step  4.
  9. Repair faulty item found in step 4)  . Start engine and let idle in closed loop. Using scan tool, monitor LT fuel trim for bank 2. If value is less than -14 percent, go to step  11. If value is not less than -14 percent, go to step  5.
  10. Replace faulty fuel injector. Start engine and let idle in closed loop. Using scan tool, monitor LT fuel trim for bank 2. If value is less than -14 percent, go to next step. If value is not less than -14 percent, go to step  5.
  11. Rich condition is not present at this time. If driveability symptoms are still present, see appropriate TROUBLE SHOOTING - NO CODES article for diagnosis. If no driveability symptoms are present, go to step  13.
  12. Diagnose fuel system. See BASIC FUEL SYSTEM CHECKS in appropriate BASIC DIAGNOSTIC PROCEDURES article. After repairs, go to next step.
  13. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Operate vehicle as close to conditions recorded in FREEZE FRAME as possible. Check for DTCs. If DTC P0175 is set, go to step  2. If DTC P0175 is not set, go to next step.
  14. 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.
RENDER: 1.0x

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When to See a Mechanic

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.
  • • You are not confident in the next step or safety outcome.