Test TC-10A - O2S Stays Below Center (Lean) (DTC 51)
WARNING: This page is about a different car, the 1994 Plymouth Sundance, 1994 Plymouth Acclaim, 1994 Dodge Spirit, 1994 Dodge Shadow, and 1994 Chrysler LeBaron. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION DIRECTORY
. For wiring diagrams, see WIRING DIAGRAMS
.
- Set parking brake and start engine. Using DRB, set engine speed to 1500 RPM. Read O2 sensor voltage value. If O2 sensor voltage is always less than 0.5 volt, go to next step. If O2 sensor voltage is always more than 0.5 volt, go to step 4).
- If O2 sensor voltage is always at zero volt, repair short to ground in O2 sensor connector Black/Dark Green wire. Perform TEST VER-2 . If O2 sensor voltage is not always at zero volts, go to next step.
- Check for tracking from O2 sensor connector Black/Dark Green wire and Black/Light Blue wire. Check for tracking on O2 sensor connector Black/Dark Green wire and Black wire. Check connectors for dirt and grease build-up. Repair as required. Perform TEST VER-2. If connectors are okay, a condition causing engine to run lean is indicated. Go to TEST NTC-1A .
- At this time, condition required to set trouble code is not present. O2S STAYS BELOW CENTER (LEAN) trouble code sets if O2 sensor output voltage stays less than 0.5 volt without changing for at least 8 minutes. Possible causes are: low fuel pressure, vacuum leak, other engine sensor calibrations, ignition system failure, O2 sensor failure or mechanical engine failure. Go to TEST NTC-1A.