Aurora V8-4.0L VIN C (1996)
Verify if the vehicle has been previously updated with an enhanced calibration from Techline CD ROM disc # 4 1997. If the vehicle was updated with an
enhanced calibration from Techline CD ROM disc # 4 1997, then consult the diagnostic procedures for the specific DTC codes listed in Section 6E of
the applicable Service Manual. If the vehicle was not updated with an enhanced calibration from Techline CD ROM disc # 4 1997, then proceed to the
specific DTC code listed and follow the instructions for that code completely.
For 02 Response and Ratio DTC Codes P0133, P0153, P1134, and P1154
Verify 02 heater operation using the appropriate Service Manual Section 6E diagnostic charts. Follow the DTC diagnostic chart to the point where it
recommends replacing the oxygen sensor. Update PCM with applicable calibration listed in the Parts Information section of this bulletin. Do NOT
replace oxygen sensor. Verify the repair using the Tech II device.
For 02 response ratio pre-converter 02 DTC code P1140
Verify 02 heater operation using the service manual section DTC diagnostic chart. Follow the diagnostic chart to the point where it recommends
replacing the oxygen sensor. Update PCM with applicable calibration listed in the Parts Information section of this bulletin. Do NOT replace oxygen
sensor. Verify the repair using the Tech II device.
For EGR System Malfunction DTC code: P0401
This DTC code is more likely to set by frequent vehicle hot starts in high ambient temperatures. Verify that there are no induction system leaks. If no
induction system leaks are found, proceed to the service manual DTC diagnostic chart. If at step 7 of the DTC diagnostic chart, the answer is "yes", then
update the PCM with the applicable calibration listed in the Parts Information section of this bulletin. Verify the repair using the Tech II device.
Parts Information
After following the specific instructions outlined above, and if performing all necessary procedures in the Service Manual indicate that a calibration
enhancement is required, then update the vehicle with the applicable enhanced calibration listed.
Warranty Information
