Engine Controls - Hesitation On Acceleration

No.: LTB00013

Issue: 2

Date: May 24, 2007

SECTION: 303-14 - ELECTRONIC ENGINE CONTROLS

Slow Acceleration from a Standing Start

AFFECTED VEHICLE RANGE:
LR3 (LA) (V8 Only) VIN: 5A000360 to 7A421934

Range Rover Sport (LS) (Normally Aspirated Only)
VIN: 6A900129 to 7A992790

New Range Rover (LM) (Normally Aspirated Only)
VIN: 6A194480 to 7A247042

ISSUE "2" CHANGES ARE HIGHLIGHTED WITH GRAY BACKGROUND. END VIN FOR EACH MODEL HAD BEEN ADJUSTED.

CONDITION SUMMARY:

SLOW ACCELERATION FROM A STANDING START

Situation:
With the engine at normal operating temperature, a customer may report a concern of an intermittent hesitation when accelerating from a standing start. This situation is most likely to be experienced in very hot ambient temperatures.

The acceleration can recover when engine speed exceeds approximately 2000 rpm or after a few seconds/feet of travel.

Action:
Should a customer express a concern, refer to the Repair Procedure detailed in this bulletin to re-configure the Engine Control Module (ECM) using the Integrated Diagnostic System (IDS).

PARTS:

No parts required. This bulletin provides concern resolution information only.

TOOLS:

IDS DVD104 with Patch File 2 or later software





WARRANTY:

NOTE:
Repair procedures are under constant review, and therefore times are subject to change; those quoted here must be taken as guidance only. Always refer to DDW to obtain the latest repair time.

DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.

REPAIR PROCEDURE

RECONFIGURE ENGINE CONTROL MODULE (ECM)

CAUTION:
This procedure requires IDS DVD104 with Patch File 2 or later software.

CAUTION:
A Midtronics PSC-550 Vehicle Power Supply must be connected to the vehicle battery during diagnosis and module configuration.

1. Connect the Midtronics PSC-550 power supply to the vehicle battery.

2. Connect IDS to the vehicle and begin a new diagnostic session, by entering the correct VIN for the current vehicle.

3. Follow the IDS prompts to read the vehicle configuration.

NOTE:
Any associated diagnostic routines should be carried out as a separate Warranty claim.

4. Carry out any associated diagnostic routines and clear any fault codes.

5. When prompted Do you wish to read diagnostic trouble codes?, select NO and then press the 'tick' button to continue.

6. When the Content Model is displayed select Vehicle Configuration tab.

7. From the Vehicle Configuration Menu, select Module Programming > Configure Existing Modules> Petrol Powertrain Control Module and then press the 'tick' button to re-configure the ECM.

8. Follow all on-screen instructions to complete this task.

9. When the task is completed, exit the current session.

10. Disconnect IDS and the power supply from the vehicle.





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