LS 460 V8-4.6L (1UR-FSE) (2007)
Required Tools & Equipment
NOTE
Additional SSTs may be ordered by calling SPX/OTC.
Repair Procedure
1. Attach a Techstream unit and test drive the vehicle. Record all data duplicating the concern. Review the Knock Correct Learn Value, and the Ignition
(IGN) Advance.
2. If the Knock Correct Learn Value drops from 17.0 CA to below 12.0 CA, and the IGN Advance goes to a negative degree value while duplicating the
concern:
^ Vehicles produced BEFORE the Group 1 VIN break in the Production Change Information table go to step 3.
^ Vehicles produced BETWEEN the Group 1 and Group 2 VIN breaks in the Production Change Information table go to Repair Procedure A.
If the values are comparable to a known good vehicle, the concern may NOT be related to this TSIB diagnose the concern per the Technical Information
System (TIS) depending upon symptoms.
3. Check the condition of the spark plugs.
^ If the spark plugs appear normal go to Repair Procedure A.
^ If one or more of the spark plugs has a brown residue on the porcelain and electrode go to Repair Procedure B.
Repair Procedure A
1. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 1. Confirm if the ECM (PCM) calibration has
been updated. If the calibration ID listed is NOT the latest ECM (PCM) calibration go to step 2.
If the calibration ID listed IS the latest ECM (PCM) calibration verify the spark plugs again for a brown residue. If no residue is found, diagnose per
TIS depending upon symptoms.
2. Flash Reprogram the ECM (PCM).
NOTE
^ The GR8 Battery Diagnostic Station MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash reprogramming the
vehicle.
^ For details on how to use the GR8 Battery Diagnostic Station, refer to the GR8 Instruction Manual located on the Technical Information System
(TIS), Diagnostics Battery.
Follow the procedures outlined in TSIB No. SS002-07,"Techstream ECU Flash Reprogramming Procedure", and flash the ECM (PCM) with the NEW
calibration file update.