Exhaust System - MIL ON/DTC P1273/Rattle on Accel.

Classification:
EC05-013

Reference:
NTB05-095

Date:
October 21, 2005

RATTLE NOISE FROM B1 CATALYST HEAT SHIELD AND/OR
MIL ON WITH DTC P1273

APPLIED VEHICLES:
2004 - 2005 Maxima (A34),
2004 - 2005 Quest (V42)
2004 - 2005 Altima (L31) VQ35 Engine ONLY

IF YOU CONFIRM

A rattle or buzz noise during acceleration

OR

A MIL "ON" with DIG P1273 A/F Sensor

ACTION





^ Inspect for a loose heat shield at the bottom of the Bank -1 catalyst. It may have "separated".

^ If heat shield is loose replace the catalyst.





PARTS INFORMATION

IMPORTANT:
The purpose of "ACTIONS" (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.

CLAIMS INFORMATION





Submit a Primary Failed Part (PP) line claim using the claims coding shown.

SERVICE PROCEDURE

1. Put the vehicle on a hoist.





2. Inspect the Bank-1 catalyst heat shield for looseness by attempting to move heat shield by hand see Figure 2.





3. Inspect the Bank-1 heat shield welds for separation see Figure 3.

4. If the heat shield is loose so it can be moved by hand or any of the 3 heat shield welds are separated, replace the catalyst.

5. If the incident included DTC P1273, after replacing the catalyst, you must also complete the following steps:

1. Erase the DTC.

2. Clear self learning using CONSULT WORK SUPPORT mode. Select SELF LEARNING CONT then START followed by CLEAR.





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