Service Action Improved Thermostat Monitoring (H281)

Publication date: 2002-10-11
Reference number: H281

SERVICE ACTION IMPROVED THERMOSTAT MONITORING

SERVICE CAMPAIGN BULLETIN

Reference Number(s): H281, Date of Issue: October 11, 2002

LAND ROVER:	Freelander (LN)
ISSUE:	1
SECTION:	Service Action Bulletins
AFFECTED VEHICLES:	Freelander (LN) 2A333058 - 2A382074

SITUATION:

FUNCTIONING THERMOSTAT MAY BE INCORRECTLY MONITORED

Under certain driving conditions the diagnostic software can misinterpret radiator outlet temperature and top hose temperature comparisons. A fault can be recorded if the temperature differential is greater than what the software anticipates. Two consecutive "trips" with this false fault detection will illuminate a MIL warning light, although no actual fault exists.

RESOLUTION:

INSTALL ENHANCED THERMOSTAT MONITORING TUNE

At PDI or at the next service opportunity the enhanced thermostat monitoring tune contained on TestBook/T4 disc DRGTC06Y or later should be loaded into the ECM to ensure that the possibility of the inappropriate MIL illumination is removed.

PARTS INFORMATION:

PARTS INFORMATION

P/N	Description	Qty.
LRN0002LABEL	Campaign Label	Qty 1 (NOTE: Sold in quantity pack of 100)

WARRANTY CLAIMS:

H281	Time 0.40 hrs. Download new tune for thermostat monitoring system

FAULT CODE: U

Normal warranty policy and procedures apply.

Material allowance is included in labor operation.

REPAIR PROCEDURE

INSTALL UPDATED ECM TUNE

Connect TestBook/T4 to the vehicle and load configuration disc DRGTC06Y or later.
Follow the on screen instructions and select:
- 'Diagnostic System'.
- 'Vehicle Configuration'.
- 'EMS ECU checks'.
Update the ECM software.
Return to the 'Diagnostic System' screen and disconnect TestBook/T4 from the vehicle.

INSTALL CAMPAIGN LABEL

NOTE: Campaign labels may have multiple Campaign numbers written on them if multiple campaigns are performed at the same time.

When all specified repairs have been accomplished, prepare the campaign label (LRN0002LABEL) as follows:
1. Place the label on a hard surface.
2. Use a ballpoint pen to neatly write/scribe in the bare aluminum areas of the label the following information:
  - Service Action code "H281"
  - Your retailer code
  - The date of repair
Clean all grease and dirt from the radiator support member.
Peel the completed campaign label from the backing paper and position it on the cleaned area.
Roll the label with the special roller tool to ensure proper adhesion.

Fig 1: Identifying Campaign Label