LCS Code - Troubleshooting Strategy
No: TB/01/04/NASRef:
Issue: 1
Date: April 30, 2004
LCS Code Troubleshooting Strategy
AFFECTED VEHICLE RANGE:
Freelander (LN) All
SITUATION:
LCS CODE CORRUPTION CAUSES T4 COMMUNICATION AND VEHICLE PROBLEMS
Use of older Freelander T4 discs May have caused LCS codes to be corrupted. This can lead to the following conditions:
^ Problems communicating with T4 to the vehicle (SAWDOC/EWS immobilization)
^ Problems with vehicle immobilization
^ Incorrect engine tune installed leading to incorrect faults being flagged - EXAMPLES:
- P1383 ignition feedback resistor open circuit
- Wide open throttle cannot be achieved
- Degraded emissions performance (catalyst loading is affected)
- Airflow meter errors
- Spark duration faults
^ Vehicle gearbox may appear to shift harshly, gearbox warm up time impaired
RESOLUTION:
CONSISTENT LCS TROUBLESHOOTING PROCESS ASSISTS PROBLEM RESOLUTION
CAUTION:
If T4 provides a "0000" or "Null" display or displays "mis-matched" or "invalid" during the initial LCS check, verification that the cable connector pins are in good condition and ensuring proper battery voltage is available should be the first step in problem resolution.
Locate and follow the proper flowchart shown based on the T4 behavior encountered at the start of the diagnostic session:
^ T4 opens at the Main Menu without LCS warnings.
^ T4 warns LCS is "Mis-Matched"
^ T4 warns LCS is "Invalid"
^ T4 initiates an automatic tune update WARNING
TOOL INFORMATION:
CAUTION:
Canadian specification vehicles: If T4 indicates an incorrect ECM tune is loaded, 2003 MY vehicles must be corrected with a special disc available from Land Rover Canada. Contact Land Rover Canada.
United States specification vehicles: Freelander 29 may limit the update of the correct ECM tune on certain vehicles with corrupted tune information. "Freelander 28" will permit the uploading of the proper tune and should be used. BE AWARE of the live "CONTINUE" button on the "Freelander 28" disc during Transmission ECU tune upload. The "CONTINUE" button must not be touched until the ECU upload is complete.
DDW WARRANTY CLAIMS:
DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.
REPAIR PROCEDURE
CAUTION:
The troubleshooting flow charts previously shown are valid only with Freelander 28 and Freelander 29 T4 discs.
NOTE:
In several places the technician will be referred to the "LCS Field Guide" published on InfoTrail. Follow the LCS icon parameters to resolve the specific condition encountered. Technicians should read and be familiar with this reference document to aid in understanding the flowcharts.
1. Ensure the vehicle battery is in a satisfactory state of charge and install a battery charger on low amp setting before beginning diagnostics.
2. Observe T4 start-up screens whenever initiating a test session with a Freelander vehicle.
3. Select the correct flowchart to ensure proper LCS verification diagnostic processes are being followed.
4. Follow the diagnostic troubleshooting logic based on the specific situation generated at the start of the T4 session with the vehicle.
NOTE
Disc "Freelander 29" may present the message "INCORRECT OR UNKNOWN ECM FITTED" with an indication that".....the CD-ROM loaded is NOT UP TO DATE...." This message will appear if the LCS code and tune problems have not been completely corrected. Freelander 29 is the latest disc available, but when this message appears Freelander 28 must be used to correct the problem because of programming limits contained in Freelander 29.
5. If for any reason T4 diagnostics must be re-started, install disc "Freelander 28" and refer to the correct flowchart based on T4's behavior for the new diagnostic session.