Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPLYMOUTH1994GRAND VOYAGER BASE, 31THREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 3.8LSELF-DIAGNOSTIC TESTSTEST TC-11A - 02S STAYS BELOW CENTER (LEAN) (DTC 51)
1994 Plymouth Grand Voyager Base, 31TH
Test TC-11A - 02S Stays Below Center (Lean) (DTC 51)
1994 Plymouth Grand Voyager Base, 31THSECTION Test TC-11A - 02S Stays Below Center (Lean) (DTC 51)
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION
in this article. For wiring diagram, see WIRING DIAGRAMS
.
- Start engine. Allow engine to run until normal operating temperature is reached. Using DRB, set engine speed to 1500 RPM and read oxygen sensor voltage. If voltage is not always less than .5 volt, condition required to set trouble code is not present at this time. Stop all tests and go to next step. If voltage is always less than .5 volt, go to step 3).
- 02S STAYS BELOW CENTER (LEAN) trouble code sets if oxygen sensor output voltage stays at less than .5 volt without changing for more than 8 minutes. Possible causes are: large vacuum leak, low fuel pressure, other engine sensor calibration failures, ignition system failure, oxygen sensor failure or fuel contamination. Go to TEST NTC-1A .
- Using DRB, check if oxygen sensor voltage is always zero volts. If oxygen sensor voltage is always zero volts, go to next step. If oxygen sensor voltage is not always zero volts, a condition causing engine to run lean is present. Go to TEST NTC-1A.
- Using DRB, stop all actuation tests. Turn ignition on with engine off. Disconnect oxygen sensor connector. Using DRB, read oxygen sensor state. If oxygen sensor state is at center, replace oxygen sensor. Perform TEST VER-2 .
- If oxygen sensor state is not at center, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using DRB in ohmmeter mode, check resistance of oxygen sensor connector (harness side), signal circuit (Dark Green/White wire).
- If resistance is less than 5 ohms, repair short to ground in Dark Green/White wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.
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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.