PINPOINT TEST G532449p8 : CHECK THE FUEL SYSTEM PRESSURE

Pinpoint Tests

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.

PINPOINT TEST G532449p8 : CHECK THE FUEL SYSTEM PRESSURE

G532449t19 : CHECK THE PUMP ACTIVITY
1. Remove the rear seat cushion.
2. Key on, engine off.
3. Listen for pump noise.

- Can the fuel pump be heard running?

-> YES
GO to Pinpoint Test G532449t36.

-> NO
CHECK for DTCs.

G532449t36 : CHECK THE FUEL SYSTEM PRESSURE

1. WARNING: This procedure involves fuel handling. Be prepared for fuel spillage at all times and always observe fuel handling precautions. Failure to follow these instructions may result in personal injury.

NOTE: The fuel pressure can be tested using the Jaguar approved diagnostic system data logger facility, or by the use of a suitable gauge from the schraeder connector on the special tool fitted to the fuel rail. Fuel System Pressure Check

Apply the parking brake.
2. Make sure the gear selector is in the NEUTRAL position for vehicles fitted with manual transmission, PARK position for vehicles fitted with automatic transmission.
3. Connect a suitable gauge to the fuel Schraeder valve.
4. Disconnect and plug the vacuum hose from the pressure regulator.
5. Key on, engine off. Make sure there are no leaks from the gauge connections
6. Record the fuel pressure reading.

- Is the fuel pressure between 4 and 5 bar (58.01 and 72.51 lb/in�)?

-> YES
GO to Pinpoint Test G532449t37.

-> NO
CHECK for DTCs.

G532449t37 : CHECK THE FUEL SYSTEM PRESSURE WITH THE ENGINE CRANKING
1. Key in start position.
2. Record the fuel pressure reading.

- Is the fuel pressure 4.5 bar (65.25 lb/in�)?

-> YES
GO to Pinpoint Test G532449t38.

-> NO
CHECK for DTCs.

G532449t38 : CHECK THE FUEL SYSTEM PRESSURE WITH THE ENGINE IDLING (WHERE POSSIBLE)
1. Key on, engine running.

- Is the fuel pressure 4.5 bar (65.25 lb/in�)?

-> YES
CHECK for DTCs and symptoms indicating another cause of the problem.

-> NO
CHECK the fuel pump power and ground circuits, GO to Pinpoint Test G532449p6.
For V6 and V8 vehicles without supercharger and GO to Pinpoint Test G532449p4.
For V8 vehicles with supercharger.