A/C - 'Handbook Symbol' Displayed on ATC Display
No: 82/01/03/NAS
Ref:
Issue: 1
Date: 27 February 2004
Automatic Temperature Control Fault
Display Correction
AFFECTED VEHICLE RANGE:
Range Rover (LP)
up to 2A427128
SITUATION:
HANDBOOK SYMBOL ILLUMINATED ON THE ATC DISPLAY
When the coolant temperature reaches 97锟斤拷C (207锟斤拷F) and stays at or above that temperature for ten minutes, the Automatic Temperature Control
(ATC) diagnostic system will illuminate the handbook symbol on the ATC display. The diagnostic fault code in the ATC panel software is set too
low for normal vehicle operating conditions in very hot climates.
RESOLUTION:
INSTALL RESISTOR TO ADJUST ATC INPUT
NOTE:
Installation of the resistor will "adjust" the displayed output temperature seen in real-time T4 monitoring. Comparing the ATC sensor output
after the modification with other coolant temperature information in real time can be misleading.
CAUTION:
It is important to verify that there is not a mechanical cause for high coolant temperatures. Inspections for leaks and verification of the coolant
level as well as proper fan and thermostat operation should all be verified.
Should a customer express concern regarding the appearance of the handbook symbol during hot weather operation, the DTCs should be examined
to determine if the vehicle has a fault for the heater core temperature sensor. If that fault is flagged on vehicles built before the above VIN, follow
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the rectification procedure in this TIB to install an in-line resistor link lead between the heater temperature sensor and the electrical harness.
Also refer to TIB 80/03/96/US for information relating to intermittent operation of early vehicle heater core sensors. Sensor date codes should be
(April 1996) or higher.
PARTS INFORMATION:
YMQ501010 Link lead Qty 1
AS400 WARRANTY CLAIMS (CANADA ONLY)
82.20.94 Time 0.10 hrs.
Install ATC system wiring resistor link lead
FAULT CODE: A
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.
Normal warranty policy and procedures apply. Material allowance is included in labor operation.
REPAIR PROCEDURE
INSTALL LINK LEAD RESISTOR
1. Refer to RAVE Workshop Manual section 82.20.94 and perform steps 1-5 to gain access to the heater temperature sensor.
2. Disconnect the heater temperature sensor multi-plug. (Arrowed in Figure 1).
3. Connect the link lead MQ501010) to the heater temperature sensor and electrical harness (Figure 2).
4. Reverse the Workshop Manual section 82.20.94 removal procedures steps 1-5, and install the removed components.Technical Service
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Bulletin # TEC820504 Date: 041220
A/C - Scraping Noise From Control Panel
No: 82/05/04/NAS
FGN LM412
Ref:
Issue: 1
Date: 20 December 2004
Heater Control Panel Fan Noise
AFFECTED VEHICLE RANGE:
New Range Rover (LM) Up to 4A164860
SITUATION:
NOISE COMING FROM CONTROL PANEL AREA
A customer may report a concern of a noise/scraping sound from the Heating, Ventilation and Air Conditioning (HVAC) control panel in the dash.
The aspirator fan, located inside the control panel, can be out of tolerance and run off-center resulting in contact with the casing.
RESOLUTION:
INVESTIGATE SOURCE OF NOISE AN REPAIR
Should a customer express concern regarding the above, the control panel should be replaced. Refer to the Service Procedure detailed in this
Bulletin.
PARTS INFORMATION:
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.
Normal warranty policy and procedures apply.
Material allowance is included in labor operation.
REPAIR PROCEDURE
REPLACE HVAC CONTROL UNIT
1. Verify the symptoms.
NOTE:
GTR lookup sequence is as follows:
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GTR Home > NAS > Service Information/ LM New Range Rover/2004 > Workshop Manuals > Service Procedures> Bookmark "Heating
and Ventilation" > "Repairs" > "Controls - heater (ECU)" link
2. Refer to GTR Workshop Manual section 80.10.02 and remove the HVAC control unit.
3. Note the control unit part number from the label and determine that the production date code is "E11" or lower. (Figure 1)
4. If the production date code is "E11" or lower, install a new unit of the correct replacement part number with a date code of "E12" or higher.
NOTE:
The battery must be capable of maintaining a full charge during the T4 programming process.
5. Verify the battery is fully charged (12.5v or greater).
6. Connect a battery charger set on a low amp current charge to maintain battery state during this process.
7. Connect 14 to the vehicle and start a diagnostic session.
8. Using 14 and Range Rover 14 disc or higher, observe all of the on-screen instructions presented and perform the following steps:
^ On the 14 Main Menu select "System Diagnostics - Air Conditioning."
^ Select "Vehicle Maintenance."
^ Select "ECU Replacement." And follow on-screen instructions.
9. When the software download is complete, disconnect the battery charger and T4.
