Fuel System - High-Pressure Injection System Diagnostics

Diagnosis of Fuel High-pressure Injection System

Vehicle Type:
Cayenne S/Cayenne Turbo/Cayenne Turbo S

Model Year:
As of 2008

Concerns:
Fuel high-pressure injection system

Information:
Attempts to repair the fuel high-pressure injection system.

INFORMATION
- Faults in the fuel high-pressure injection system are often caused by defects in the pre-delivery system (fuel low pressure).
- "Guided Fault Finding" using the PIWIS Tester must therefore be performed in order to diagnose the fuel high-pressure injection system.

- The following fault codes relate to the fuel high-pressure injection system:
- P1021-P1023-P 1025-P 1026-P 1027-P 1030-P 1031-P12A1-P 12A2.

Tools:
PIWIS Tester 9718 with test software version 20.100/01/2008 (or higher)

Work Procedure
Go to "Guided Fault Finding".

Before getting started, connect a suitable battery charger with a current rating of at least 40 A to the jump-start terminals in the engine compartment.
1 Connect the PIWIS Tester (with software version 20.10 or higher) to the vehicle and switch it on.
2 Switch on ignition.
3 Go to the PIWIS Tester Start menu and select --> "Diagnosis".
4 Select vehicle type Cayenne.
5 Press >> to start the automatic search for existing control units. The fault memory is read out
6 Select --> "DFI" in the "Control units" menu and confirm by pressing >> .
7 Select "Fault memory" and confirm your selection by pressing >>.
8 If there are no faults displayed in the PIWIS Tester display -> Continue with Step 12.
9 F5 now allows you to start "Guided Fault Finding".
10 In the Entry into Guided Fault Finding menu, read the instructions in the PIWIS Tester display and press Next to confirm.
11 Work through the specified test plan. End of remedial action.
12 Press Esc to return to the Start menu.
13 Go to the PIWIS Tester Start menu and select--> 'Faultfinding'.
14 Select vehicle type Cayenne.
15 Select the model year.
16 Select the model.
17 Confirm your selection by pressing >>.
18 Select -> "DME Direct Fuel Injection (DFI)" in the Control unit selection menu and confirm by pressing >>.
19 In the Entry into Guided Fault Finding menu, read the instructions in the PIWIS Tester display and press Next to confirm.
20 In the Selection menu, select--> "1st Guided Fault Finding" by pressing 1-1-1.
21 In the "Fault memory contents" menu, press >> to continue.
22 Select -> "Symptom" in the "Defect report" menu.
23 Select the symptom of the complaint and read and work through the instructions on the PIWIS Tester. End of remedial action.
24 Disconnect the PIWIS Tester from the vehicle and shut it down, if necessary.
25 Switch off the ignition.
26 Disconnect battery charger.
27 Read the following chapters in the workshop Manual
-->Workshop Manual '200201 Checking fuel pressure (low pressure) on DFI engines'
-->Workshop Manual '206601 Checking fuel delivery rate (low pressure delivery rate) on DFI engines' for subsequent diagnosis.

References:
-->Workshop Manual '200201 Checking fuel pressure (low pressure) on DFI engines'
-->Workshop Manual '206601 Checking fuel delivery rate (low pressure delivery rate) on DFI engines' for subsequent diagnosis.





Disclaimer