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HOMESERVICE MANUALSSATURN1997SC1 AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TROUBLE CODESDTC P0134 - O2S CIRCUIT OPEN/INACTIVEDIAGNOSTIC PROCEDURES
1997 Saturn SC1 Automatic

Diagnostic Procedures

1997 Saturn SC1 AutomaticSECTION Diagnostic Procedures
  1. Start and operate engine for greater than 5 minutes. Connect scan tool. Ensure engine coolant temperature is greater than 140°F (60°C). O2S voltage should be varying from less than 391 mV to greater than 491 mV. If voltage is varying as specified, problem is intermittent. See DIAGNOSTIC AIDS. If voltage is not varying as specified, go to next step.
  2. Turn ignition on, with engine off. Disconnect O2S harness connector. Jumper O2S harness connector terminal to ground. If scan tool reads less than 100 mV, check for terminal tightness or faulty O2S. If scan tool does not read less than 100 mV, go to next step.
  3. Remove jumper wire. Using a DVOM, check voltage at O2S harness connector terminal. If voltage reading is .3-.6 volt (300-600 millivolt), replace PCM. If voltage reading is greater than .6 volt (600 millivolt), check for open ground circuit, terminal tightness or faulty PCM. If voltage reading is less than .3 volt (300 millivolt), check for open signal circuit, terminal tightness or faulty PCM.
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.