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Home >> Saturn >> 1999 >> SW2 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P0100-P0134 >> DTC P0134 >> DTC P0134: Ho2S Circuit-Insufficient Activity-Bank 1, Sensor 1 (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K" & "L", "M", "P", "S" & "T" Series) >> Diagnostic Procedures

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. Using scan tool, store DTC information from VCM. Clear DTCs and reset fuel trim values. Start engine and allow it to reach normal operating temperature. Monitor HO2S 1 voltage on scan tool. If voltage is fixed at 351-551 mV, go to step  4. If voltage is not as specified, go to next step.
  3. Condition that set DTC is not present at this time. Check for exhaust leaks and condition of HO2S 1 related circuits and connections. Repair as necessary. After repairs, go to step  17. If no problem is found, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect HO2S 1 harness connector. Using jumper wires, jumper HO2S 1 high and low signal circuits to ground. Turn ignition on. Monitor HO2S 1 voltage with scan tool. If voltage is less than 20 mV, go to step  7. If voltage is not less than 20 mV, go to next step.
  5. Turn ignition off. Remove jumper wires. Disconnect VCM harness connector containing HO2S 1 circuits. Measure resistance of HO2S 1 high and low signal circuits between HO2S 1 and VCM. If resistance of both circuits is less than 5 ohms, go to next step. If resistance of either circuit is not less than 5 ohms, go to step  9.
  6. Check VCM harness connections. Repair as necessary. After repairs, go to step  17. If connections are okay, go to step  16.
  7. Remove jumper wires from HO2S 1. Turn ignition on. Connect test light between HO2S 1 heater ignition feed and ground circuits at HO2S 1 harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  10.
  8. Turn ignition off. Reconnect HO2S 1 harness connector. Disconnect VCM harness connector containing HO2S 1 low signal circuit and VCM harness connector containing VCM ground circuits. Measure resistance between HO2S 1 low signal circuit and one of the VCM ground circuit terminals at VCM harness connector. If resistance is less than 500 ohms, go to step  12. If resistance is not less than 500 ohms, go to step  11.
  9. Repair circuit with high resistance. After repairs, go to step  17.
  10. Repair HO2S 1 heater ignition feed or ground circuit. After repairs, go to step  17.
  11. Repair high resistance between HO2S 1 low signal circuit and VCM ground circuit. After repairs, go to step  17.
  12. Check for exhaust leaks upstream of HO2S 1. Repair as necessary. After repairs, go to step  17. If no leaks are found, go to next step.
  13. Allow engine to completely cool. Measure resistance between HO2S 1 low signal circuit and one of the VCM ground circuit terminals at VCM harness connector. If resistance is less than 500 ohms, go to step  15. If resistance is not less than 500 ohms, go to next step.
  14. Remove HO2S 1. Clean threads and apply anti-seize compound, and then reinstall. Measure resistance between HO2S 1 low signal circuit and one of the VCM ground circuit terminals at VCM harness connector. If resistance is less than 500 ohms, go to step  17. If resistance is not less than 500 ohms, go to next step.
  15. Replace HO2S 1. After repairs, go to step  17.
  16. Replace VCM. Program replacement VCM using required equipment. Perform Passlock® reprogramming and CKP system variation learn procedures. After repairs, go to next step.
  17. Using scan tool, clear DTCs. Start engine and operate vehicle under conditions required to set this DTC. If scan tool indicates this test ran and passed, go to next step. If scan tool does not indicate this test ran and passed, go to step  2.
  18. 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.
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