DIAGNOSIS AND TESTING

Overview

For battery condition indicator information: REFER to: Battery and Cables (414-01 Battery, Mounting and Cables, Description and Operation). For battery charging and testing, refer to the instructions for the equipment in use in your own workshop.

The generator operates within a "smart" system, able to allow for temperature variations and optimize battery charging.

For information on the description and operation of the system: REFER to:

Generator (414-02A Generator and Regulator - V8 S/C 4.2L Petrol, Diagnosis and Testing),

Generator (414-02B Generator and Regulator - V8 N/A 4.4L Petrol, Description and Operation),

Generator (414-02C Generator and Regulator - TDV6 2.7L Diesel, Description and Operation),

Generator (414-02D Generator and Regulator - TDV8 3.6L Diesel, Description and Operation).

Inspection and Verification

Verify the customer concern.

Visually inspect for obvious mechanical or electrical faults.

Visual inspection

Mechanical	Electrical
Generator Drive belt Drive belt tensioner Generator pulley Check the security of the generator fittings	Generator Battery Starter motor Harnesses and connectors Fuses Battery junction box (BJB) - fuse 20E Starter motor megafuse Charge warning light function Controller area network (CAN) circuits Engine control module (ECM)

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the symptom chart or DTC index.

Symptom chart

Symptom	Possible Cause	Action
Charge warning lamp does not illuminate	Warning lamp/circuit - fault Generator - internal fault CAN Bus - circuit fault Engine control module - internal fault	Check the warning lamp function with the ignition on and the engine off Repair the circuit as necessary Check for DTCs indicating a generator, CAN or engine control module fault
Charge warning lamp stays on/battery discharges	Accessory drive belt - fault Generator pulley slipping on shaft Generator - internal fault Battery cable - fault CAN Bus - circuit fault Engine control module internal fault Central junction box	Check the battery and generator cables Refer to the electrical guides Check for DTCs indicating a generator fault Check the accessory drive belt condition and tension Check that the pulley does not rotate independently of the generator Check for DTCs indicating a CAN, central junction box or engine control module fault
Charge warning lamp intermittent	Accessory drive belt slipping Battery cable - fault Generator - circuit fault Generator - internal fault CAN Bus - circuit fault	NOTE: Use of a power pack or boost charger may bring the warning lamp on until disconnected Check the accessory drive belt condition and tension Check the battery and generator cables refer to the electrical guides Check for DTCs indicating a generator or CAN circuit fault
Battery discharges without the charge warning lamp staying on	Battery - fault Battery quiescent drain Intermittent generator - fault	Check the battery condition Check for battery quiescent drain Check for DTCs indicating a generator fault If no other reason for discharge can be found, check the circuit. Refer to the electrical guides
Noise (mechanical)	Accessory drive belt slipping	Check the accessory drive belt condition and tension Disconnect the accessory drive belt and check that the generator rotates freely

DTC index

NOTE:

Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system).

For a full list of Engine control module (ECM) DTCs: REFER to:

Electronic Engine Controls (303-14A Electronic Engine Controls - V8 S/C 4.2L Petrol, Diagnosis and Testing),

Electronic Engine Controls (303-14B Electronic Engine Controls - V8 N/A 4.4L Petrol, Diagnosis and Testing),

Electronic Engine Controls (303-14C Electronic Engine Controls - TDV6 2.7L Diesel, Diagnosis and Testing),

Electronic Engine Controls (303-14 Electronic Engine Controls - TDV8 3.6L Diesel, Diagnosis and Testing).

PINPOINT TEST A : DENSO NON-BMS GENERATOR DIAGNOSTIC FLOW CHART
A1: MIDTRONICS BATTERY TEST
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTES: The battery must be fully charged and any battery defects rectified before continuing with generator diagnosis The voltmeter must display readings to three decimal places (i.e. 0.001V) Ignition on is position 2 on a keyed ignition system
	1 Using a Midtronics hand held tester or the Midtronics GR-1 diagnostic charger, carry out the "Midtronics battery test" as detailed in the battery care manual. REFER to: Battery Care Requirements (414-00 Battery and Charging System - General Information, Description and Operation).
	2 Record battery diagnostic result on the provided form
	Does the battery pass the "Midtronics battery test"? Yes GO to Pinpoint Test B. No Rectify any battery defects before continuing with generator diagnosis GO to Pinpoint Test B.

PINPOINT TEST B : DENSO NON-BMS GENERATOR DIAGNOSTIC FLOW CHART
B1: GENERATOR DUTY CYCLE
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTE: The heated rear screen is timed to operate for 10 minutes, then cycle on and off dependent on external conditions. This test requires completion within this 10 minute period
	1 Using the manufacturer approved diagnostic system, select Measurement Application. Select Complete Vehicle Data-logger. Select 303-00 Engine System. Select the data-logger parameter “Generator Command” to view the PWM duty %
	2 Connect a voltmeter to the vehicle battery
	3 Switch ignition state to on (engine off)
	4 Turn off all electrical loads e.g. (blower, radio, interior lights etc.)
	5 Start the engine, switch on the heated rear screen Ensure the heated rear screen is on (see note above) and that the air conditioning system is off. Wait 90 seconds
	6 Record battery voltage (V1) and generator regulator control PWM Duty %.. Using the graph, plot the battery voltage from your multi-meter (V1) and duty cycle readings from the manufacturer approved diagnostic system
	7 Switch off engine
	Does the generator regulator control PWM duty alternate between 40.1% and 3% in 5 sec intervals? Yes GO to Pinpoint Test C. No Use the comparison graph and instructions (below) to diagnose battery voltage (V1)

PINPOINT TEST C : CIRCUIT CHECK
C1: CIRCUIT CHECK
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 Refer to the electrical circuit diagrams and check ALT MON and ALT COM circuit for short circuit to ground, short circuit to power, open circuit, high resistance
	Did the circuit check pass? Yes Install a new generator. 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 No Repair the circuit as required REFER to: Wiring Harness (418-02, Description and Operation).GO to Pinpoint Test B.

Battery Voltage V1 Graph Comparison

Plot on the graph the band to which battery voltage reading (V1) relates

To which band did the battery voltage (V1) apply?

Use the table below to continue diagnosis

Voltage	Graph Band	Link to Test Procedure
Voltage (V1) plotted during pinpoint test B1	Area 1 of the graph	GO to Pinpoint Test D.
Voltage (V1) plotted during pinpoint test B1	Area 2 of the graph	GO to Pinpoint Test E.
Voltage (V1) plotted during pinpoint test B1	Area 3 of the graph	GO to Pinpoint Test F.
Voltage (V1) plotted during pinpoint test B1	Area 4 of the graph	GO to Pinpoint Test G.

PINPOINT TEST D : GRAPH COMPARISON AREA 1
D1: GRAPH COMPARISON AREA 1
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 When the voltage (V1) was compared to the graph above
	Did the voltage (V1) = area 1 of the graph? Yes The output is within the expected range. Do not replace the alternator. If customer concern is still evident contact dealer technical support No No further action required

PINPOINT TEST E : CIRCUIT CHECKS
E1: CIRCUIT CHECKS
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 Refer to the electrical circuit diagrams and check BATT SENSE circuit for short circuit to ground, short circuit to power, open circuit, high resistance between: RR Sport & Discovery = generator connector C0053 and the engine junction box Range Rover = generator connector C0053 and central junction box
	Did the circuit check pass? Yes Install a new generator. 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 No Repair the circuit as required REFER to: Wiring Harness (418-02, Description and Operation).GO to Pinpoint Test B.

PINPOINT TEST F : GRAPH COMPARISON AREA 3
F1: GRAPH COMPARISON AREA 3
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 When the voltage (V1) was compared to the graph above
	Did the voltage (V1) = area 3 of the graph? Yes Install a new generator. 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 No No further action required

PINPOINT TEST G : GRAPH COMPARISON AREA 4
G1: GRAPH COMPARISON AREA 4
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 When the voltage (V1) was compared to the graph above
	Did the voltage (V1) = area 4 of the graph? Yes GO to Pinpoint Test H. No Carry out the diagnostic once more GO to Pinpoint Test B. . If customer concern is still evident contact dealer technical support

PINPOINT TEST H : REGULATOR CONTROL DUTY CYCLE
H1: REGULATOR CONTROL DUTY CYCLE
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 Using the generator regulator control duty cycle reading PWM Duty %
	Is the generator regulator control PWM duty cycle stuck at 100%? Yes GO to Pinpoint Test I. No GO to Pinpoint Test J.

PINPOINT TEST I : CIRCUIT CHECKS 1
I1: CIRCUIT CHECKS 1
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 Refer to the electrical circuit diagrams and check ALT MON and ALT COM circuits for short circuit to ground, short circuit to power, open circuit, high resistance
	Did the circuit checks pass? Yes Install a new generator. 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 No Repair the circuit as required REFER to: Wiring Harness (418-02, Description and Operation).GO to Pinpoint Test B.

PINPOINT TEST J : CIRCUIT CHECKS 2
J1: CIRCUIT CHECKS 2
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTE: The heated rear screen is timed to operate for 10 minutes, then cycle on and off dependent on external conditions. This test requires completion within this 10 minute period
	1 Connect a voltmeter to the vehicle battery
	2 Switch ignition state to on (engine off)
	3 Turn off all electrical loads e.g. (blower, radio, interior lights etc.)
	4 Start the engine, switch on the heated rear screen Ensure the heated rear screen is on (see note above) and that the air conditioning system is off.
	5 Voltage measurement Measure the voltage drop between the generator body and battery negative terminal and record the value (V2)
	6 Voltage measurement Refer to the electrical circuit diagrams and measure the voltage drop between the generator B+ and battery positive terminal and record the value (V3)
	Does the voltage drop value (V2) or (V3) = less than 0.3 Volts ? Yes Install a new generator. 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 No Switch off Engine. Refer to the electrical circuit diagrams and check the generator, battery and engine, power and ground circuits for loose or corroded connections. Repair the circuit as required REFER to: Wiring Harness (418-02, Description and Operation).GO to Pinpoint Test B.

Published: 15-Dec-2011

2007.0 Range Rover Sport (LS), 414-00

Battery and Charging System - General Information

Charging System (G953327)