Maintenance, Self Diagnostics: Diagnosis Porsche Cayenne I

Condition inspection

Visually inspect the belt strap for damage by unrolling it completely.

If it displays evidence of damage in the form of cuts, fraying, seam tears etc., the seat belt must be replaced.

Drive shafts: visual inspection of boots

Perform a visual inspection of the boots for leaks and damage.

Brake system: visual inspection of brake pads and brake discs for wear

> The brake pads must be replaced when the brake pad warning indicator lights up, but no later than when there is a residual pad thickness of 2 mm.

> Brake discs must be replaced on reaching the wear limits.

Note. If brake pad wear is indicated by the warning light, the warning contact (sender including line and plug connection) must also be replaced. Replacement of the warning contact can be avoided by replacing the brake pads no later than when the pad thickness is approx. 2.5 mm -arrows-. see scheme 12 Warning contacts must be replaced if the core of the line is worn. However, if only the plastic part of the warning contact is worn, there is no need to replace it.

Scheme 2

1. To check the brake pads, remove the wheels.

2. Visually inspect the brake pads for wear. Refer to > Running gear maintenance: visual inspection - brake lines/brake pads/brake discs [9PAAD1 9PAAD7 9PAAE1 9PAAE7 9PAAF1] .

3. Carry out visual inspection of the brake discs for wear. Refer to > Running gear maintenance: visual inspection - brake lines/brake pads/brake discs [9PAAD1 9PAAD7 9PAAE1 9PAAE7 9PAAF1] .

Test procedure

Note. The LED for permanent positive -9- is lit for the entire duration of the test. see scheme 41

Scheme 3

1. Switch on the ignition and switch through the following loads in turn

Switch on left -1- or right direction indicator -4-: the direction indicator and direction indicator pilot light for the trailer in the instrument cluster light up. Press the relevant key -B- for left or -C- right: during flashing, the LEDs -1- or see scheme 42 -4- and the direction indicator in the instrument cluster should not now light up. see scheme 42

2. Actuate brake pedal - LEDs -6- should light up. see scheme 42

3. Switch on parking light - LEDs -5, 7- should light up. see scheme 42

4. Switch on parking light and rear fog light. Switch on parking light - LEDs -5, 7- should light up. see scheme 42

Disconnect the trailer hitch plug. The rear fog light on the vehicle must light up.

5. Switch off the lights and engage reverse gear.

The back-up light on the vehicle must light up.

General

10- Charge positive see scheme 42

11- Ground for charge positive see scheme 42

12- Trailer detection see scheme 42

13- Depending on the load (heat build-up) in the test equipment (the more LEDs that are lit up), the tester will switch off and this is indicated by this LED lighting up. Disconnect the test equipment and let it cool for at least 20 minutes. see scheme 42

Test drive - maintenance

Note. The following test items are included in the test drive.

Actuate remote control of central locking and check operation.

Seats: check operation of adjustments.

Check footbrake operation and actuation travel.

Start engine, check operation.

Actuate clutch, check operation.

Actuate steering, check operation.

Shift transmission, check operation.

ParkAssist: select reverse gear and check operation.

Activate cruise control during the test drive and check operation.

Actuate PSM switch during the test drive and check operation.

Check operation of heating adjustment when engine is warm.

Check operation of air-conditioning system when engine is running.

Check operation of instruments.

Visual inspection of rollers (front cardan shaft)

1. Remove engine guard. Refer to 10 80 19 Removing and installing engine guard - as of MY 2003 (All Models) .

2. Inspect air bellows of front cardan shaft for damage. To do this, rotate the cardan shaft in steps through 180°.

3. Install engine guard. Refer to 10 80 19 Removing and installing engine guard - as of MY 2003 (All Models) .

Visual inspection of center bearing (rear cardan shaft)

1. Inspect air bellows of center bearing for damage. To do this, rotate the cardan shaft in steps through 180°.

Scheme 4

The Porsche System Tester is connected to the vehicle via a 16-pin diagnosis socket. The diagnostic socket is located inside the vehicle below the dashboard near to the driver (left-hand drive vehicles) or the passenger (right-hand drive vehicles) -arrow-. see scheme 45

1. Start Porsche System Tester (PST) and follow the instructions on the Tester.

2. Select vehicle type with >> and perform the automatic control unit search.

3. If a # star appears in front of the relevant control unit, read out the fault memory. Follow the instructions of the PST.

4. > Resetting maintenance interval

Visual inspection

1. Check airbag units visually

1.1. Check that no trim or stickers are attached to the airbag units (driver's, passenger's, side, head airbag).

1.2. Visual inspection of the components for damage and deformation.

1.3. The system check must be certified in the stamp spaces provided in the Guarantee and Maintenance booklet.

Function test of the airbag system

1. Function test of the airbag system

1.1. Move the driver's seat back and up as far as possible.

1.2. Unclip front cover of driver's seat subframe.

1.3. Connect and switch on the Porsche System Tester.

1.4. Switch on ignition.

1.5. Establish communication with the airbag control unit.

1.6. Read out fault memory: No fault stored.

> Never carry out the drive link test when the vehicle is in motion.

> The drive link test must always be carried out on a stationary vehicle in a workshop with adequate commercially available tools. The cutoff relay must be activated again following the drive link test. Only then can the engine be restarted (see warning note below).

1.7.

1.8. Start the engine and activate central locking system with the switch in the door trim panel.

1.9. Start the Drive links menu.

Note. When you perform the drive link test: The cutoff relay is activated. The cutoff relay must be activated again. To activate the cutoff relay: Press on the colored area of cutoff relay (located in power distributor). The engine is switched off. The hazard warning lights are activated. The central locking system is opened.

1.10.

1.11. Read out and erase fault memory for the DME control module and airbag control unit.

1.12. Switch off ignition and disconnect battery.

>

1.13.

Scheme 5

2. Simulate the fault

2.1. Simulate the fault using the side airbag, for example. Move seat all the way forward.

Note. To check the operation of the airbag system, a plug connection is disconnected from an airbag unit. A fault code - Static fault - must then be stored in the Porsche System Tester.

2.2.

2.3. Fold up retainer on plug socket -1- -A-, press lock -B- on airbag connector -2- and pull out connector -C-. (Scheme 4)

2.4. Connect the battery and switch on ignition.

2.5. Read out fault memory. Static fault present.

Scheme 6

3. Correct the fault

3.1. Switch off ignition, disconnect the battery and wait one minute.

3.2. Fold up retainer -A- on plug socket -1- and insert connector -2- -B- until it is felt to engage. see scheme 48

4. Read out and delete faults

4.1. Connect the battery, switch on ignition and read out the fault memory with the Porsche System Tester.

Note. Fault memory shows a sporadic fault.

4.2.

4.3. Erase fault memory.

Carry out work instruction after disconnecting the battery. --> 90 IN WORK INSTRUCTIONS AFTER DISCONNECTING THE BATTERY - AS OF MY 2003 (ALL MODELS EXCEPT CAYENNE S TIO TITAN) .