Porshe 911 (997). Manual - part 111

 

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Porshe 911 (997). Manual - part 111

 

 

- Checking fuel pressure

Tools

Designation

Type

Number

Explanation

pressure gauge

special tool

378a

connecting cable

special tool

9559

PIWIS Tester

special tool

9718

Checking fuel pressure

Checking fuel pressure

Note

601

The battery voltage must not fall below 12 volts during the fuel pressure check.

• 

1. Check the battery charging condition e.g. using a voltmeter or the Porsche PIWIS Tester. The battery

voltage must not fall below 12 volts during the check.

Warning sign for naked flames

DANGER

Risk of fire from escaping fuel.

Danger of fatal injury and damage to property.

• 

→ Observe basic safety instruction when working on the fuel system, → 201000  Precautionary measures

when working on fuel system.

→ Secure working area.

2. Attach or mount a warning sign in a clearly visible position on the

vehicle.

3. Relieve the fuel pressure → 206601 Checking quantity delivered by fuel

pump.

Cap on test connection

DANGER

Risk of fire from escaping fuel.

Danger of fatal injury and damage to property.

• 

→ Observe basic safety instruction when working on the fuel system, → 201000  Precautionary measures

when working on fuel system.

Diagnostic system: reading out fault memory and activating systems

Checking fuel pressure

602

→ Secure working area.

4. Release metal cap on test connection at fuel collection pipe and screw it off by hand (a/f 13 mm). Collect

emerging fuel with a cloth.

Pressure gauge for checking fuel pressure

5. Join the connecting cable 9559 using the pressure gauge 378a (union nut a/f 17).

A - Connecting cable (9559)

• 

B - Pressure gauge (378a)

• 

Connecting cable for fuel pressure

6. Tighten the knurled union nuts of the connecting cable by hand on the test connection of the fuel

collection pipe -arrow- .

Procedure when engine is not running:

7. Connect the Porsche PIWIS Tester PIWIS Tester 9718 to the input socket in the vehicle using the adapter

lead and switch on the ignition. Switch on the Tester and select the vehicle (option: Diagnostics).

Diagnostic system: reading out fault memory and activating systems

Checking fuel pressure

603

Control unit search on PIWIS Tester

8. Run the individual control unit search for DME using the Porsche PIWIS Tester. To do this, select

DME with the tracer pen and press F12 >>.

Activating the fuel pump relay

9. Once the individual control unit search for DME is complete, select the Drive links item, then select

the fuel pump relay and activate by pressing F8 - Start.

Pressure gauge in the vehicle

10. Read value on pressure gauge. → Fuel pressure - engine not running: 3.8 bar +/-0.2 bar

Deactivating the fuel pump relay

11. Deactivate the fuel pump relay on the PIWIS Tester by pressing F8 - Stop. Then, press F11 << to

return to the start screen and switch off the Tester.

12. Switch off the ignition and remove PIWIS Tester adapter lead in the

vehicle.

13. To check the engine at idle speed: connect the pressure gauge 378a as described above and start the

engine. Switch off the engine after reading the fuel pressure. → Fuel pressure - idle speed: 3.8 bar +/-0.2
bar

14. Loosen the union nut on the connecting cable 9559 for the pressure gauge 378a on the test connection

Diagnostic system: reading out fault memory and activating systems

Checking fuel pressure

604

 

 

 

 

 

 

 

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