Engine Controls - Engine Rattle Noise On Cold Start Up
Classification: EC07-002BReference: NTB07-021B
Date: May 6, 2009
2007-2008 ALTIMA; WITH QR25 ENGINE RATTLE WHEN STARTING
This bulletin has been amended. The Claims Information and Service Procedure have been updated. No other changes have been made. Please discard all previous versions of this bulletin.
APPLIED VEHICLES: 2007 Altima Sedan (L32) with QR25 engine (Excludes Hybrid)
2008 Altima Coupe (CL32) with QR25 engine
APPLIED DATES 2007 Altima Sedan-All dates
2008 Altima Coupe built before August 17, 2007
APPLIED VINs 2007 Altima Sedan-All VINs
2008 Altima Coupe built before 1N4AL2(***)8C 119642
IF YOU CONFIRM
When the engine is started after a "cold soak" of more than 4 hours:
^ There is a rattle for 1-2 seconds (if the rattle noise lasts longer than 2 seconds this bulletin does not apply,
and
^ The rattle noise is not coming from the catalytic converter heat shield (see campaign bulletin NTB08-001),
and
^ The rattle is coming from the IVT (Intake Valve Timing) sprocket / camshaft intake sprocket at the front of the engine,
and
^ The engine oil level is confirmed to be in the "operating" range.
ACTION
Refer to the Repair Flow Chart above to determine the correct actions for the vehicle you are working on.
SERVICE PROCEDURE
1. Connect C-III to the vehicle to begin the ECM reprogramming procedure.
^ If you are not familiar with the ECM reprogramming procedure, refer to "CONSULT- III (C-III) ECM Reprogramming" general procedure.
CAUTION
2. When you get to the ECM Reprogramming screen shown in Figure 1 (example), do the following:
A. If there is a part number listed in the Part Number column, write it on the Repair Order.
B. Refer to the Repair Flow Chart to determine the correct actions for the vehicle you are working on.
Table A
PARTS INFORMATION
CLAIMS INFORMATION
Disclaimer