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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 P0161: HO2S HEATER CIRCUIT - BANK 2, SENSOR 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: HO2S 2 heater must be cool before proceeding with diagnosis. Ensure ignition switch has been in OFF position for at least 30 minutes.
  2. Install scan tool. Turn ignition on, with engine off. Immediately record HO2S 2 voltage using scan tool. Monitor voltage for 2 minutes. If voltage gradually increases or decreases by.15 volt (150 mV), go to next step. If voltage does not gradually increase or decrease by.15 volt (150 mV), go to step  4.
  3. Condition required to set DTC is not present at this time. Check for damaged HO2S 2 or intermittent HO2S 2 circuit faults. Repair as necessary. After repairs, go to step  14. If no problem is found, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect HO2S 2 harness connector. Connect test light between heater ignition feed and ground circuits at HO2S 2 harness connector. Turn ignition on. If test light illuminates, go to next step. If test light does not illuminate, go to step  6.
  5. Remove test light. Using jumper wires, connect HO2S 2 high signal and low circuits to ground. Ensure ignition is on. Monitor HO2S 2 voltage with scan tool. If voltage is less than 20 mV, go to step  8. If voltage is not less than 20 mV, go to step  7.
  6. Connect test light between ground and heater ignition feed circuit at HO2S 2 harness connector. If test light illuminates, go to step  9. If test light does not illuminate, go to step  10.
  7. Turn ignition off. Remove jumper wires. Disconnect VCM harness connectors containing HO2S 2 high signal and low circuits. Measure resistance of HO2S 2 high signal and low circuits. If resistance of each circuit is less than 5 ohms, go to step  12. If resistance of either circuit is not less than 5 ohms, go to step  11.
  8. Replace HO2S 2. After repairs, go to step  14.
  9. Repair open in HO2S 2 heater ground circuit. After repairs, step  14.
  10. Repair no voltage condition on HO2S 2 heater ignition feed circuit. After repairs, go to step  14.
  11. Repair circuit that measured high resistance. After repairs, go to step  14.
  12. Check for faulty VCM harness connections. Repair as necessary. After repairs, go to step  14. If connections are okay, go to next step.
  13. Replace VCM. Program replacement VCM using required equipment. Perform Passlock® reprogramming and CKP system variation learn procedures. After repairs, go to next step.
    14. NOTE: HO2S 2 heater must be cool before proceeding with diagnosis. Ensure ignition switch has been in OFF position for at least 30 minutes.
  14. Turn ignition on, with engine off. Immediately record HO2S 2 voltage using scan tool. Monitor voltage for 2 minutes. If voltage gradually increases or decreases by.15 volt (150 mV), go to next step. If voltage does not gradually increase or decrease by.15 volt (150 mV), go to step  4.
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTC are displayed, system is okay.
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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.