Jaguar XJ (X350). Manual — part 520

Air Charge Temperature (ACT) sensor

Location: fitted to the pressure side of the air intake throttle valve.

The ACT sensor measures the intake air or the charge air temperature and supplies the ECM with an

analog signal.

Fuel Rail Pressure sensor

Location: fitted to the diverter rail which in turn is bolted to the high pressure pump at the rear of

the engine.

The fuel pressure sensor measures the instantaneous fuel pressure in the fuel rail very precisely

within a very short time and supplies a voltage signal according to the pressure.

Fuel Temperature sensor

Location: the fuel temperature sensor is located on the low pressure side of the high pressure pump

in the case of the common rail system. The sensor measures the temperature of the fuel in the low

pressure system. Air and excessive heat in the fuel system can have an adverse effect on the

operation of the sensor.

Exhaust Gas Recirculation (EGR) valves

Location: there are two EGR valves fitted, one to each exhaust manifold. These are water cooled and

electronically controlled by the ECM.

Diagnosis and testing

Engine

Inspection and Verification

1 . Verify the customer concern.

2 . Visually inspect for obvious signs of mechanical or electrical damage.

Mechanical

•

Coolant level

•

Coolant leaks

•

Oil level

•

Oil leaks

•

Visibly damaged or worn parts

•

Loose or missing nuts or bolts

3 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)

before proceeding to the next step

4 . If the cause is not visually evident, verify the symptom and

Engine - 3.0L/3.5L/4.2L .

Active engine mounts

Overview

The active engine mount system operates at idle speed to help damp out any vibration from the

engine.

The system is triggered by a signal from the engine control module activating the mounts at engine

speeds between 600 and 900 rpm, when the mounts will operate as a pair.

The system determines which side mount is which by sending a ground signal to the right hand

mount (this pin is vacant on the left hand mount).

Inspection and Verification

1 . Verify the customer concern.

If the customer concern is of a vibration at other than idle speed, then the fault is not with the

active engine mounts.

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2 . Use the Jaguar approved diagnostic system or a scan tool to retrieve any fault codes, as other

causes of vibration or misfire should be eliminated before condemning an active engine mount.

3 . Visually inspect for obvious signs of mechanical or electrical damage.

Mechanical

Electrical

•

Active engine mounts, correct fitment/damage

•

Routing of pipework etc to avoid vibrations

•

Contact anywhere between the driveline and
chassis

•

Fuse 9, front power distribution box

•

Harnesses/connectors

•

Active engine mounts

•

Engine control module (ECM)

4 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)

before proceeding.

5 . If any DTCs were present in the steps above, make sure their causes are rectified before beginning

any work on the active engine mounts.

Pinpoint test

PINPOINT TEST G414540p1 : ACTIVE
ENGINE MOUNTS

G414540t1 : CHECK THE ACTIVE ENGINE MOUNT FUNCTION

1.

Circuit

Pin

Power ground 01

Power supply

02

Signal

03

Ground

04

2.

Circuit

Pin

Power ground 01

Power supply

02

Signal

03

3.

Circuit

Pin

Active engine mount signal H1

4. Key off. 5. Disconnect the right hand active engine mount connector, PI065. 6. Using the Jaguar

approved diagnostic system, activate the mounts. 7. Check for operation of the left hand mount.

Operation can be confirmed by feeling for vibration of the mount. 8. Key off. 9. Reconnect the right

hand active engine mount connector, PI065. 10. Disconnect the left hand active engine mount

connector, PI066. 11. Using the Jaguar approved diagnostic system, activate the mounts. 12. Check

for operation of the right hand mount.

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