| Subject: | Revised DTC P0131 and DTC P0151 |
| Models: | 2003 Cadillac DeVille, Seville |
| with 4.6L Engine (VINs
Y, 9 - RPOs LD8, L37) |
This bulletin is being issued to revise Step 7 of DTC P0131 and DTC P0151
in the Engine Controls sub-section of the Service Manual. Please replace the current
information in the Service Manual with the following information.
The following information has been updated within SI. If you are using a paper
version of this Service Manual, please make a reference to this bulletin on the affected
page.
Step
| Action
| Yes
| No
|
7
| Inspect for the following that may affect the HO2S operation:
| • | HO2S contamination--Inspect the HO2S for contamination. |
| • | Chafed, burnt, cut, pinched, or otherwise damaged HO2S wiring |
| • | The HO2S must have a clean air reference in order to function properly.
This clean air reference is obtained by way of the HO2S wires. Obstruction of the
air reference and degraded HO2S performance could result from any attempt to repair
the above conditions. |
| • | Exhaust system leaks or restrictions |
| • | Any water intrusion in to the HO2S connector |
| • | Any lean fuel injectors--Refer to Fuel Injector Balance Test with
Tech 2®. |
| • | An inaccurate mass air flow (MAF) sensor--Refer to Scan Tool Data
List. |
| • | Evaporative Emissions (EVAP) system malfunction--Inspect the EVAP
control system. Refer to Inspection/Maintenance (I/M) Evaporative Emission (EVAP)
System Set Procedure. |
| • | Incorrect fuel pressure can affect HO2S operation. Refer to Fuel System
Diagnosis. |
Did you find and correct the condition?
| Go to Step 12
| Go to Step 8
|
