Pcm Code E045, Right Oxygen (O2) Sensor Rich Signal: Action

PCM turns on SERVICE ENGINE SOON light. PCM turns on canister purge solenoid.

1. With O2 sensor disconnected, parameter ED33 should remain at reference voltage (.38-.63 volt).
2. This step checks PCM ability to recognize lean input readings.
3. PCM compares O2 sensor signal voltage received on circuit No. 412 to ground voltage on circuit No. 413. If PCM does not have a good ground to engine on circuit No. 413, O2 sensor can appear falsely high or low. With engine running, use a voltmeter to measure voltage between O2 sensor at exhaust manifold and PCM terminal E15. If voltage is -.05 to +.05 volt, ground is okay. If voltage is less than -.05 volt or greater than +.05 volt, repair poor ground on circuit No. 413 between PCM terminal E15 and ground at front of engine on right cylinder head.