Engine Controls - Idle Dip When A/C is Switched ON

No: LTB00011
Issue: 1
Date: 15 Jan 2007

SECTION: 303-14 - ELECTRONIC ENGINE CONTROLS

Engine Idle Dips

AFFECTED VEHICLE RANGE:
New Range Rover (LM) (Normally Aspirated Only) VIN: 6A194480 to 6A239035

CONDITION SUMMARY:

ENGINE IDLE DIPS
Situation: A customer may report a concern that the engine idle may dip when the air conditioning (A/C) is switched 'ON' or the A/C compressor engages.

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.




Normal warranty policy and procedures apply.

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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