Download MIL Comes On With DTC P2195 or P2197 (Supersedes 04-038, dated August 10, 2004, to update the information marked with the black bars) SYMPTOM The MIL is on, and DTC P2195 (rear air fuel ratio sensor signal stuck lean) or P2197 (front air fuel ratio sensor signal stuck lean) is set. PROBABLE CAUSE The ECM/PCM software incorrectly interprets sensor inputs, causing the codes to set. REPAIR PROCEDURE NOTE: •Before you update an ECM/PCM, make sure the battery in the vehicle is fully charged. •To prevent ECM/PCM damage, do not operate anything electrical (audio system, brakes, A/C, power windows, moonroof, etc.) during the update. 1. If not already done, load the May 2004 or later i N CD onto the i N master terminal. Loading instructions are included with the CD. 2. Update the ECM/PCM software with the HIM. For updating instructions, refer to Programming the HIM and Updating an ECM/PCM With a Programmed HIM in Service Bulletin 01-023, Updating Control Units/Modules . 3. Warm up the engine to operating temperature, then shut if off. 4. Do the ECM/PCM RESET and the CKP PATTERN CLEAR with the HDS. 5. Do the ECM/PCM idle learn procedure: •Make sure all electrical items (A/C, audio, rear window defogger, lights, etc.) are off. •Turn the ignition switch to the ON (II) position for 30 seconds. •Start the engine, and let it idle (throttle closed and all electrical items off) for 10 minutes. 6. Do the low-rpm CKP pattern learn: •Test-drive the vehicle on a level road: With the A/T in second gear, or the M/T in second or third gear, decelerate (with the throttle fully closed) from 2,500 rpm down to 1,000 rpm . •Stop the vehicle, and put the transmission into Park or Neutral. Set the parking brake. Do not turn off the ignition switch.
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