Right O2S Stays Below Center (Lean) (DTC 51)
NOTE:
For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.3L
article in ENGINE PERFORMANCE. After each repair, perform TEST VER-2
.
NOTE:
Scan tool displays left oxygen sensor as O2 and right oxygen sensor as O2R.
- Using scan tool, set engine speed to 1500 RPM. Read right Oxygen Sensor (O2S) voltage. If right O2S voltage is always more than 0.5 volt, go to step 3). If right O2S voltage is always less than 0.5 volt, go to next step.
- If RIGHT O2S STAYS BELOW CENTER (LEAN) trouble code is not in memory, replace restricted injector for right intake manifold bank. If RIGHT 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. RIGHT O2S STAYS BELOW CENTER (LEAN) trouble code sets if right O2S 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, right O2S failure, or fuel contamination. Go to TEST NTC-1A .