Test TC-15A - Left O2S Stays Below Center (Lean) (DTC 51)
WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, 1994 Chrysler New Yorker, 1994 Chrysler LHS, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For circuit & connector terminal identification, see CONNECTOR IDENTIFICATION DIRECTORY TABLE
. For wiring diagrams, see WIRING DIAGRAMS
section. After each repair, perform TEST VER-2
.
NOTE:
DRB displays left oxygen (O2) sensor as O2 and right oxygen (O2) sensor as O2R.
- Using DRB, set engine speed to 1500 RPM. Read left O2 sensor voltage. If left O2 sensor voltage is always more than 0.5 volt, go to step 3). If left O2 sensor voltage is always less than 0.5 volt, go to next step.
- If LEFT O2S STAYS BELOW CENTER (LEAN) trouble code is not in memory, replace restricted injector for left intake manifold bank. If LEFT O2S STAYS BELOW CENTER (LEAN) trouble code is in memory, a condition causing engine to run lean in all cylinders is indicated. Go to TEST NTC-1A .
- At this time, the condition required to set trouble code is not present. LEFT O2S STAYS BELOW CENTER (LEAN) trouble code sets if left O2 sensor signal stays less than 0.5 volt without changing for more than 8 minutes. Possible causes are: major vacuum leak, low fuel pressure, other engine sensor calibrations, ignition system failure, left O2 sensor failure, or fuel contamination. Go to TEST NTC-1A .