Land Rover Discovery: General Information Charging
System / Diagnosis and
Testing
PRINCIPLES OF OPERATION
For a detailed description of the Charging System, refer to the relevant
Description and Operation section in the workshop manual. REFER to:
Generator (414-02A Generator and Regulator - TD4 2.2L Diesel, Description
and Operation),
Generator (414-02B Generator and Regulator - GTDi 2.0L Petrol/GTDi 2.0L
Petrol - SULEV, Description and Operation).
INSPECTION AND VERIFICATION
CAUTION:
Diagnosis by substitution from a donor vehicle is NOT acceptable.
Substitution of control modules does not guarantee confirmation of a
fault, and may also cause additional faults in the vehicle being tested
and/or the donor vehicle.
NOTES:
- If a control module or a component is suspect and the vehicle
remains under manufacturer warranty, refer to the Warranty Policy
and Procedures manual, or determine if any prior approval
programme is in operation, prior to the installation of a new
module/component.
- When performing voltage or resistance tests, always use a digital
multimeter accurate to three decimal places, and with an up-todate
calibration certificate. When testing resistance always take the
resistance of the digital multimeter leads into account.
- Check and rectify basic faults before beginning diagnostic routines
involving pinpoint tests.
- Verify the customer concern
- Visually inspect for obvious signs of damage and system integrity
Visual Inspection
- If an obvious cause for an observed or reported concern is found,
correct the cause (if possible) before proceeding to the next step
- If the cause is not visually evident, verify the symptom and refer to
the
Symptom Chart, alternatively check for Diagnostic Trouble Codes
(DTCs) and refer to the DTC Index
- Check DDW for open campaigns. Refer to the corresponding bulletins
and SSMs which may be valid for the specific customer complaint and
carry out the recommendations as required
SYMPTOM CHART
DTC INDEX
For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this
vehicle, please refer to Section 100-00. REFER to: Diagnostic Trouble Code
Index - DTC: Central Junction Box (CJB) (100-00 General Information,
Description and Operation).
General information quiescent drain
VEHICLE QUIESCENT CURRENT TESTING
On vehicles fitted with a Battery Monitoring System (BMS), the diagnostic
routine for quiescent drain testing in the approved Jaguar or Land Rover
diagnostic system should be utilized.
If a customer complains of a vehicle battery that discharges continuously or
when left for a prolonged period of time, it is recommended that a
quiescent drain test is performed as described below.
The battery drain should be measured using the approved Jaguar or Land
Rover diagnostic system or a Digital Volt Ohm Meter (DVOM). A procedure
for quiescent drain measurement using the diagnostic system is available in
the Diagnosis and Testing section of the Workshop Manual. The vehicle
should be in the locked/armed state (for example vehicle alarm fully armed),
all doors, hood and luggage compartment lid/tailgate are open and latched
(so as to appear closed from an electrical point of view). The test should
take place after the vehicle has entered shutdown mode. The time taken for
this to occur after the ignition is switched off varies according to model
(Refer to the Topix On line resource for details).
When the vehicle is armed, the effect of the security system Light Emitting
Diode (LED) flashing is to cause a pulsation in the measured current drain. In
this case, either the average current should be taken (using a DVOM with an
averaging system) or the current reading taken, ignoring the brief high
current peaks.
EQUIPMENT
Approved Jaguar or Land Rover diagnostic system with current probe OR
DVOM with current probe.
METHOD OF MEASUREMENT
Using an Approved Jaguar or Land Rover Diagnostic System.
- Switch off all electrical loads and ensure that the ignition is off
(power
mode 0)
- Connect the current probe to the approved Jaguar or Land Rover
diagnostic system
- Calibrate the probe
- Install a clamp around the battery lead/junction box lead
- Go to the Quiescent Current Testing section in this procedure
Using a Digital Volt Ohm Meter (DVOM)
Do not use an in-line DVOM to measure the quiescent drain on vehicles
fitted with an electronic throttle (for example Range Rover 2002MY
onwards). The current exceeds the maximum amount the fuse in the DVOM
is capable of handling.
- Switch off all electrical loads and ensure that the ignition is off
(power
mode 0)
- Connect the current probe to the DVOM
- Calibrate the probe
- Install a clamp around the battery lead/junction box lead
- Go to the Quiescent Current Testing section in this procedure
QUIESCENT CURRENT TESTING
- Switch ignition to 'on' or select ignition power mode 6 in keyless
vehicles and switch to 'off' (power mode 0) (do not crank)
- Remove key from ignition switch (if equipped)
- Open and latch all doors, hood and luggage compartment lid or
tailgate
- Lock the vehicle using the remote function on the remote handset or
smart key. (Single lock only to avoid volumetric alarm arming)
- Remove any other potential electrical drains such as accessories
plugged into accessory sockets
- Record the amperage readings after the shutdown period referenced
in the Topix on line resource for details. Note: all cars from 10MY
onwards should be less than 30mA after 30 minutes (for exceptions
see Land Rover Quiescent Drain Values table).
- Record the final reading on the battery report form.
The preferred method of testing following an excessive current
consumption figure is to use a current probe around individual junction box
leads to the various suspected circuits to identify a potential cause. This is
in
preference to the old method of removing fuses for the following reasons:
- The drain may be caused by a control module remaining active and
preventing the quiescent drain from reducing to normal levels
- The drain may be caused by a relay winding that is activated. Pulling
the
fuse can allow this to 'reset' and the drain will be lost and go
undiagnosed.
LAND ROVER QUIESCENT DRAIN VALUES
NOTE:
- The total current drain will be higher if certain approved
accessories are fitted (for example: tracker, trailer module, etc.)
- Applies to vehicles without Tire Pressure Monitoring System
(TPMS). Vehicle shut-down period with TPMS is approximately 15
minutes.
READ NEXT:
Generator and regulator - ingenium I4 2.0l diesel
description and operation
COMPON ENT LOCATION
Local Interconnect Network (LIN) bus connection
Generator
Battery positive connection
OVERVIEW
A
REMOVAL
NOTES:
Removal steps in this procedure may contain installation details.
Some variation in the illustrations may occur, but the essential
information is always correct.
Refer to: Loadspac
SEE MORE:
PART(S)
REMOVAL
NOTE:
Removal steps in this procedure may contain installation details.
WARNING:
Make sure to support the vehicle with axle stands.
Raise and support the vehicle.
NOTE:
Before disconnecting any components of the active driveline
hydraulic system, the two pipe port closing valve must
Fan shroud
Cooling fan motor
Electrical connection
Speed flaps
An electric, variable speed cooling fan is installed in a shroud attached to
the rear of the radiator. The cooling fan is operated by an electric cooling
fan control module, integrated into the electric motor, under the control o