Test TC-10A - 02S Stays Above Center (Rich) (DTC 52)
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, 1995 Dodge Caravan, and 1995 Chrysler Town & Country. 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
. For wiring diagrams, see WIRING DIAGRAMS
section at the end of this article.
- Start engine. Allow engine to run until normal operating temperature is reached. Using scan tool, set engine speed to 1500 RPM. Using scan tool, read Oxygen Sensor (O2S) voltage. If voltage is not always more than .5 volt, condition required to set DTC is not present at this time. Go to next step. If voltage is always more than .5 volt, go to step 3).
- O2S STAYS ABOVE CENTER (RICH) DTC sets if O2S output voltage stays at more than .5 volt, but less than 1.2 volts, without changing for more than 8 minutes. Possible causes are: high fuel pressure, other engine sensor calibration failures, ignition system failure, O2S failure or fuel contamination. Go to TEST NTC-1A.
- Using scan tool, stop all actuation tests. Turn ignition off. Inspect air cleaner filter and inlet ducts for restrictions. If restrictions are present, repair as necessary. Perform TEST VER-2. If restrictions are not present, remove upper half of intake manifold.
- Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) fuel system test. Inspect all injectors for leakage. If injectors are leaking, stop ASD fuel system test. Replace leaking fuel injectors as necessary. Perform TEST VER-2.
- If injectors are not leaking, stop ASD fuel system test using scan tool. A condition causing engine to run rich is present. Go to step 2).