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Home >> Chevrolet >> 1998 >> Venture Base, Van Passenger Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0134 - Ho2S Insufficient Activity Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Ensure engine is at normal operating temperature. Start engine and increase engine speed to 1200 RPM for 2 minutes. Using scan tool, monitor HO2S 1 voltage. If voltage is varying outside the range of 400-500 mV, go to next step. If voltage is within the 400-500 mV range, go to step 4).
  3. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for DTC P0134 until DTC P0134 test runs. If scan tool indicates FAILED THIS IGN, go to next step. If scan tool does not indicate FAILED THIS IGN, see DIAGNOSTIC AIDS.
  4. Turn ignition on, with engine off. Disconnect HO2S 1 connector. Connect a jumper wire between ground and sensor signal circuit terminal at HO2S 1 harness connector. If voltage is less than 150 mV, go to step 8). If voltage is not less than 150 mV, go to next step.
  5. Turn ignition on, with engine off. Disconnect jumper wire. Using DVOM, measure voltage between heater ground circuit and sensor signal circuit terminals at HO2S 1 harness connector. If voltage is near 450 mV, go to next step. If not, go to step 7).
  6. Turn ignition off. Disconnect PCM connector. Check continuity of ground circuit between PCM connector and HO2S 1 harness connector. If resistance is not greater than 5 ohms, go to step 9). If resistance is greater than 5 ohms, repair open in ground circuit. After repair is completed, go to step 13).
  7. Turn ignition off. Disconnect PCM connector. Check continuity of signal circuit between PCM and HO2S 1 harness connectors. If resistance is not greater than 5 ohms, go to step 10). If resistance is greater than 5 ohms, repair open in ground circuit. After repair is completed, go to step 13).
  8. Turn ignition off. Disconnect and inspect HO2S 1 connector. Inspect for damaged pins, corrosion and loose wires. Repair as necessary. After repairs, go to step 13). If connector is okay, go to step 11).
  9. Check for poor HO2S 1 ground circuit terminal connection at PCM connector. Repair terminal as necessary. After repairs, go to step 13). If connector is okay, go to step 12).
  10. Check for poor HO2S 1 signal circuit terminal connection at PCM connector. Repair terminal as necessary. After repairs, go to step 13). If connector is okay, go to step 12).
  11. Replace oxygen sensor. After replacing sensor, go to step 13).
  12. Replace PCM. Program replacement PCM using required equipment. After replacing sensor, go to next step.
  13. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for DTC P0134 until DTC P0134 test runs. If scan tool indicates FAILED THIS IGN, repeat step 2). If scan tool does not indicate FAILED THIS IGN, repair is complete.
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