Initial Inspection and Diagnostic Overview

Inspection and Verification
1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart

Mechanical - Electrical
- Drive belt - Battery
- Drive belt tensioner - Generator
- Generator - Fuse
- Generator pulley (vehicles fitted with manual transmission) - Circuit
- Wiring harness for damage or corrosion
- Electrical connectors
- Warning lamp operation

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
2. If the cause is not visually evident, verify the symptom and refer to the Jaguar Approved Diagnostic System.

Principle of operation
The diesel charging system differs from that used in petrol-engined variants in that it incorporates a 'smartcharge' function.

This function is capable of supplying infinitely variable voltages to the battery, depending on the temperature and on the current requirements of the battery.

The system continuously monitors the battery voltage and temperature (via the ambient air temperature sensor), and uses a map of both to deliver the optimum charge to the battery.

Another feature of this system is that it uses a 'wake-up' and 'sleep' strategy, initiated by the ignition switch position and Engine Control Module (ECM) to avoid current drain.

Inspection and Verification
1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage.
3. Check the vehicle battery condition and state of charge before condemning any of the charging system components.

Visual Inspection Chart

Mechanical Electrical
- Generator - Generator
- Drive belt - Battery
- Drive belt tensioner - Charging system warning light function (ignition ON, engine OFF)
- Generator pulley - Fuse 36 (7.5A) front power distribution box (battery voltage sense)
- Check the security of the generator fittings - Engine/Generator ground connection
- Circuit(s)
- Electrical Connector(s)
- Engine Control Module (ECM)

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
2. If the cause is not visually evident and the Jaguar approved diagnostic system is not available, use a scan tool to retrieve the fault codes before proceeding to the symptom chart.

CAUTION: When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part number 3548-1358-00.

NOTE:
- When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.
- Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.