Test TC-9A - O2S Stays Above Center (Rich) (DTC 52)

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 .

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 step 3). If O2 sensor voltage is always more than 0.5 volt, check for tracking (short to voltage) from O2 sensor connector Dark Green/Black wire to Dark Green/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 rich is indicated. Go to TEST NTC-1A .
At this time, condition required to set trouble code is not present. O2S STAYS ABOVE CENTER (RICH) trouble code sets if O2 sensor output voltage stays more than 0.5 volt, but less than 1.2 volts, without changing for at least 8 minutes. Possible causes are: high fuel pressure, other engine sensor calibrations, ignition system failure, O2 sensor failure, or mechanical engine failure. Go to TEST NTC-1A.