Transverse Interlock: Other Porsche Cayenne I

Transverse lock

Diagnosis software number: QSP 0101

Cayenne as of model year 2003

General instructions/safety instructions

Communication between transverse lock control unit and Porsche System Tester II No. 9588

Note. The following conditions must be met in order to establish communication between the transverse lock control unit and the Porsche System Tester II No. 9588: Porsche System Tester II No. 9588 connected to data link connector The battery voltage must be greater than approx. 6.5 V

Fault code setting conditions

Fault codes can be set in several circumstances, e.g.

1. when disconnecting battery
2. when disconnecting plug connections
3. faulty/incorrect coding
4. if the voltage drops
5. etc.

In these circumstances, no fault is present in the system and the fault memory must be erased.

Possible causes of fault

Note. The 'possible causes of fault' that are responsible for the fault are listed here. Please note that in certain circumstances further faults can be stored in the fault memory after troubleshooting (e.g. if plugs are disconnected). After carrying out repairs, read out the fault memory of all control units and erase any faults.

Fault type

The following fault types are possible

1. no display
2. upper limit value exceeded
3. lower limit value not reached
4. mechanical fault
5. no signal/communication
6. no or incorrect basic setting/adaptation
7. short circuit to B+
8. short circuit to ground
9. implausible signal
10. open circuit/short circuit to ground
11. open circuit/short circuit to B+
12. open circuit
13. electrical fault in electric circuit
14. please read out fault memory
15. faulty
16. cannot be checked now

Fault status

The following status types are possible

1. present
2. not present

This information should be saved using the 'Save key' [F4] and printed out.

Note. Visual inspection: During troubleshooting, please check first that the affected pins on the control unit plug connection are neither damaged nor corroded. The wires and plugs of the affected components must also be checked for external damage and correct contacts. Repair damaged or corroded pins if possible, otherwise replace affected pins. Repair or replace damaged wires.

Note. Battery voltage: A battery voltage of between 11.4 and 14.5 V is required for troubleshooting. This must be checked and provided if necessary. Voltages to components and fuses (input side) must be guaranteed on the vehicle electrical system.

Freeze frame (frozen fault boundary conditions)

Freeze frame data is standardized and records operating conditions in the event of a fault. Freeze frames have different priorities, which can be important when output to a Scan Tool. These can be viewed in the "extended fault memory" of the Porsche System Tester II No. 9588.

Furthermore, various operating conditions can be stored for each fault. These can provide reference points for determining the cause of a fault in the case of difficult diagnoses. These can be viewed in the "extended fault memory" of the Porsche System Tester II No. 9588.

Fault deletion counter

An individual deletion counter runs for every fault detected. It determines the storage duration of the related fault.

When a fault is first detected, the deletion counter is set to 80, for example (suspected fault).

If a non-persistent fault is detected as having been remedied, the deletion counter is set to 10, for example (fault did not occur often enough to be confirmed).

Whenever a persistent fault is detected, the deletion counter is set to 40, for example. This value is retained until the fault is detected as having been remedied.

The deletion counter is decremented by 1 after every warm-up cycle if the fault in question is a non-persistent fault or is detected as having been remedied (faults that are confirmed, but are not detected as having been remedied are not decremented in the deletion counter). If the deletion counter reaches the value 0, the fault is deleted from the memory.

Fault frequency counter

This counter shows how often a fault has recurred following its first occurrence. If the frequency value is 1, the fault has only occurred once. It can now be either "present" or "not present". The fault frequency counter is incremented whenever this fault recurs (the fault correction counter was decremented in the meantime, i.e. a check was performed and found to be OK). A higher value in the fault frequency counter can therefore indicate a loose contact.

Tools - transverse lock

Note. Before starting the diagnosis a suitable charging device must be connected to maintain battery capacity. Plug contacts are optimally designed to suit the plug system. Operations on pins can cause contact problems. Always use suitable measurement tools for adapter plugs and test cables.

Scheme 145

Scheme 146

Scheme 147

Scheme 148

Scheme 149

Component arrangement 'Item 10' Selector switch (running gear control module)

1. Selector switch housing
2. Selector switch housing lower part
3. Symbols 'Level control LED'
4. Slider 'Manual set level'
5. Switch 'PASM running gear tuning'
6. Slider 'Manual set longitudinal lock/transverse lock/gear reduction'
7. Symbols 'Longitudinal lock/transverse lock/gear reduction LED'

Scheme 150

Scheme 151

CONNECTOR TERMINALS REFERENCE CHART

Gear selection switch connector assignment (running gear control module), '16-pin'

A - Plug connection for 'gear selection switch (running gear control module)' (at underside of housing)

Scheme 152

CONNECTOR TERMINALS REFERENCE CHART

Possible cause of fault

1. Incorrect vehicle type selected in the Porsche System Tester II No. 9588
2. Porsche System Tester II No. 9588 is not connected correctly or is faulty
3. Power supply to the 'transverse lock control unit' is not OK
4. 'K-line' to 'transverse lock control unit' faulty
5. 'CAN drive' does not function: plug connection to DME control module must be checked for proper seating and contact
6. Transverse lock control unit' does not function

Affected pins

Transverse lock control unit plug

1. Pin 11 'CAN drive (low)'
2. Pin 23 'K-line'
3. Pin 41 'terminal 15 power supply via fuse F47/fuse carrier at left of dashboard'
4. Pin 42 'CAN drive (high)'
5. Pin 46 'terminal 30 power supply via fuse F22/fuse carrier at left of dashboard'
6. Pin 47 'ground from body ground pin MB41_ring 2'

Integrated functions

The transverse lock control unit includes the functions listed below

1. Computer identification
2. Computer configuration with ignition ON
3. Checking the fault memory for fault entries, even in diagnostic mode
4. Erasing the fault memory
5. Reading measured values from switches and sensors

Supported functions

1. Diagnosis software number
2. Drive link test with active fault checking

Basic setting

1. Adaptation/Resetting of adaptation values
2. Read memory
3. Write memory
4. Update program
5. Flash program (end of volume)
6. Protected against unauthorized access

Commissioning

When the ignition 'terminal 15' is switched on, an internal function test (initialization phase) is performed in the transverse lock control unit. When the internal function test is completed successfully, all functions integrated in the transverse lock control unit are activated.

Operating condition

The transverse lock control unit is in operating mode once the ignition is switched on and the internal function test is completed successfully. Within the defined limits for power supply and temperature, all incoming signals are processed by the integrated software and the appropriate monitoring and control processes are performed.

Data transfer

The transverse lock control unit sends and receives data/information via the following 'CAN data bus'

1. CAN drive (C)
2. Gateway (in instrument cluster)

Fault memory

Faults that occur during operation are stored in a non-volatile memory (e.g. EEPROM). The faults remain in memory even if no voltage is present at terminals 15 and 30. The fault memory is designed in such a way that the occurring faults, data source, fault type and fault deletion counter can be saved. The transverse lock control unit sends messages and checks the CAN drive cyclically for messages from other control units. If no messages are received for a certain time period, a fault is stored in the fault memory.

Adaptation

Work to be carried out after replacing a control module

1. Delete the adaptation values using the Porsche System Tester II No. 9588

Coding

Note. The transverse lock control unit does not have to be coded!

1. 'Below lower limit': battery discharged or faulty
2. 'Below lower limit': fuse faulty
3. 'Below lower limit': line short circuit to ground or open circuit
4. 'Below lower limit', alternator faulty
5. 'Below lower limit': transverse lock control unit faulty
6. 'Above upper limit': alternator faulty
7. 'Above upper limit': transverse lock control unit faulty

Transverse lock control unit plug

1. Pin 46 'terminal 30', from fuse carrier at left of dashboard 'fuse 22'
2. Pin 47 'ground', from ground pin 'MB41'

1. 'No Signal/communication': no message from steering-angle sensor

Transverse lock control unit plug

1. Pin 11 'CAN drive (low)'
2. Pin 42 'CAN drive (high)'

Communication problem with all control units via CAN drive.

1. 'No signal/communication': DME control module not connected or CAN drive faulty

Transverse lock control unit plug

1. Pin 11 'CAN drive (low)'
2. Pin 42 'CAN drive (high)'

Communication problem with all control units via CAN drive.

1. 'Please read out fault memory': to localize fault, read out fault memory for 'DME control module'
2. 'No signal/communication': No message from DME control module on CAN drive (check DME control module for proper contact)

Transverse lock control unit plug

1. Pin 11 'CAN drive (low)'
2. Pin 42 'CAN drive (high)'

1. 'Please read out fault memory': to localize fault, read out fault memory for 'PSM control unit'
2. 'No signal/communication': no message from 'PSM control unit' on CAN drive

Transverse lock control unit plug

1. Pin 11 'CAN drive (low)'
2. Pin 42 'CAN drive (high)'

1. 'Please read out fault memory': signal from instrument cluster does not correspond to expected signal
2. 'No signal/communication': signal from instrument cluster does not appear on CAN drive

Transverse lock control unit plug

1. Pin 11 'CAN drive (low)'
2. Pin 42 'CAN drive (high)'

1. 'Fault': transverse lock control unit plug faulty

Transverse lock control unit plug

1. Pin '-'

1. 'Fault': transverse lock control unit plug faulty

Transverse lock control unit plug

1. Pin '-'

1. 'Fault': transverse lock control unit plug faulty

Transverse lock control unit plug

1. Pin '-'

Control unit malfunction

This fault causes the power/voltage supply to the servo motor 'A / B', brakes 'A / B', sensors and CAN communication to switch off.

1. 'Open circuit': fault detected in computer during internal function test of transverse lock control unit.
2. 'Fault': fault detected in computer during internal function test of transverse lock control unit.

Transverse lock control unit plug

1. Pin '-'

Potentiometer 1, transverse lock

Note. This fault code relates to the signal of potentiometer '1' (sensor 1) which, together with potentiometer '2' (sensor 2) and the temperature sensor, is integrated as a unit in the servo motor.

1. 'Short circuit to B+': signal line of potentiometer '1' (sensor 1) short circuit to B+ (12 V)
2. 'Short circuit to B+': transverse lock control unit faulty
3. 'Short circuit to ground': signal line of potentiometer '1' (sensor 1) open circuit or short circuit to ground
4. 'Short circuit to ground': potentiometer faulty
5. 'Short circuit to ground': transverse lock control unit faulty

Transverse lock control unit plug

1. Pin 12 'input signal to potentiometer 1 (sensor 1)', from pin B3 of 'servo motor sensor plug'

Potentiometer 2, transverse lock

Note. This fault code relates to the signal of potentiometer '2' (sensor 2) which, together with potentiometer '1' (sensor 1) and the temperature sensor, is integrated as a unit in the servo motor.

1. 'Short circuit to B+': signal line of potentiometer '2' (sensor 2) short circuit to B+ (12 V)
2. Short circuit to B+': transverse lock control unit faulty
3. 'Short circuit to ground': signal line of potentiometer '2' (sensor 2) open circuit or short circuit to ground
4. 'Short circuit to ground': potentiometer faulty
5. 'Short circuit to ground': transverse lock control unit faulty

Transverse lock control unit plug

1. Pin 31 'input signal to potentiometer 2 (sensor 2)', from pin B4 of 'servo motor sensor plug'

Voltage supply to sensors

Note. This fault code relates to the voltage supply to sensors: potentiometer '1' (sensor 1), potentiometer '2' (sensor 2) and the servo motor temperature sensor, which are integrated as a unit in the servo motor.

1. 'Above upper limit': voltage supply line (5 V) short circuit to B+ (12 V)
2. 'Above upper limit': transverse lock control unit faulty
3. 'Below lower limit': voltage supply line (5 V) short circuit to ground
4. 'Below lower limit': transverse lock control unit faulty

Transverse lock control unit plug

1. Pin 1 'voltage supply (5 V) for potentiometer' to pin B1 of 'servo motor sensor plug'
2. Pin 29 'voltage supply (5 V) for servo motor temperature sensor' to pin B5 of 'servo motor sensor plug'

Control unit switched off due to excess temperature

Note. This fault may be stored after extreme oft-road driving. This fault does not necessarily mean a fault is present!

1. 'Above upper limit': heavy demand on servo motor (mechanical stress)
2. 'Above upper limit': mechanical wear of servo motor
3. 'Above upper limit': transverse lock control unit faulty

Transverse lock control unit plug

1. Pin '-'

Communication problem with all control units via CAN drive.

1. 'Please read out fault memory': to localize fault, read out fault memory for 'transverse lock control unit'
2. 'No Signal/communication': no message via CAN drive
3. 'Fault': internal fault in transverse lock control unit

Transverse lock control unit plug

1. Pin 11 'CAN drive (low)'
2. Pin 42 'CAN drive (high)'

1. 'Short circuit to B+': short circuit in wiring harness (servo motor runs continuously)
2. 'Short circuit to B+': control unit faulty (servo motor runs continuously)
3. 'Short circuit to ground': short circuit in wiring harness (servo motor does not function)
4. 'Short circuit to ground': short in servo motor winding or short circuit in servo motor leads (servo motor does not function)
5. 'Short circuit to ground': control unit faulty (servo motor does not function)
6. 'Open circuit/short circuit to ground': open circuit/short circuit in wiring harness (servo motor does not function)
7. 'Open circuit/short circuit to ground': open circuit/short in servo motor winding or short circuit in servo motor leads (servo motor does not function)
8. 'Open circuit/short circuit to ground': control unit faulty (servo motor does not function)
9. 'Electrical fault in electric circuit': open circuit/short circuit in servo motor or in leads (servo motor does not function)
10. 'Electrical fault in electric circuit': control unit faulty (servo motor does not function)

Transverse lock control unit plug

1. Pin 15 'servo motor (A)', to pin A1 of 'servo motor plug A'
2. Pin 16 'servo motor (B)', to pin A2 of 'servo motor plug B'

1. 'Short circuit to B+': short circuit in wiring harness (servo motor runs continuously)
2. 'Short circuit to B+': control unit faulty (servo motor runs continuously)
3. 'Short circuit to ground': short circuit in wiring harness (servo motor does not function)
4. 'Short circuit to ground': short in servo motor winding or short circuit in servo motor leads (servo motor does not function)
5. 'Short circuit to ground': control unit faulty (servo motor does not function)
6. 'Open circuit/short circuit to ground': open circuit/short circuit in wiring harness (servo motor does not function)
7. 'Open circuit/short circuit to ground': open circuit/short in servo motor winding or short circuit in servo motor leads (servo motor does not function)
8. 'Open circuit/short circuit to ground': control unit faulty (servo motor does not function)
9. 'Electrical fault in electric circuit': open circuit/short circuit in servo motor or in leads (servo motor does not function)
10. 'Electrical fault in electric circuit': control unit faulty (servo motor does not function)

Transverse lock control unit plug

1. Pin 15 'servo motor (A)', to pin A1 of 'servo motor plug A'
2. Pin 16 'servo motor (B)', to pin A2 of 'servo motor plug B'

1. 'Short circuit to B+': short circuit in wiring harness (brake for servo motor continuously activated)
2. 'Short circuit to B+': control unit faulty (brake for servo motor continuously activated)
3. 'Open circuit/short circuit to ground': short circuit in wiring harness (brake for servo motor does not activate)
4. 'Open circuit/short circuit to ground': short in servo motor winding or short circuit in servo motor leads (brake for servo motor does not activate)
5. 'Open circuit/short circuit to ground': control unit faulty (brake for servo motor does not activate)

Transverse lock control unit plug

1. Pin 21 'supply voltage to brake for servo motor', to pin B10 of 'servo motor plug B'

1. 'Short circuit to B+': short circuit in wiring harness (brake for servo motor does not activate)
2. 'Short circuit to B+': short circuit in wiring harness (brake for servo motor does not activate)
3. 'Short circuit to B+': control unit faulty (brake for servo motor does not activate)

Transverse lock control unit plug

1. Pin 36 'supply voltage to brake for servo motor', to pin B9 of 'servo motor plug B'

Servo motor temperature sensor

Note. The servo motor temperature sensor is integrated with potentiometer '1' (sensor 1) and potentiometer '2' (sensor 2) as a unit in the servo motor.

1. 'Short circuit to B+': short circuit to B+ (12 V) in the voltage supply (5 V)/ground supply wiring
2. 'Short circuit to ground': short circuit to ground in the voltage supply (5 V)/ground supply wiring

Transverse lock control unit plug

1. Pin 29 'voltage supply (5 V) for servo motor temperature sensor' to pin B5 of 'servo motor sensor plug'
2. Pin 44 'ground for servo motor temperature sensor' to pin B6 of 'servo motor sensor plug'

Transverse lock mechanical fault

Note. After successful read out the fault memory must be erased and after satisfying the diagnostic conditions below must be read out again!

1. 'Mechanical fault': mechanical wear in transverse lock

Transverse lock control unit plug

1. Pin '-'

Current sensor in control unit

Note. The current sensor is integrated in the transverse lock control unit and can not be separately replaced.

1. 'implausible signal'

Transverse lock control unit plug

1. Pin '-'

1. 'Electrical fault in electric circuit': open circuit/short circuit in wiring harness (brake for servo motor does not activate)
2. 'Electrical fault in electric circuit': short in servo motor winding (brake) or open circuit/short circuit in servo motor leads (brake for servo motor does not activate)
3. 'Electrical fault in electric circuit': control unit faulty (brake for servo motor does not activate)
4. 'Mechanical fault': brake for servo motor does not hold

Transverse lock control unit plug

1. Pin 21 'supply voltage to brake for servo motor', to pin B10 of 'servo motor plug B'
2. Pin 36 'supply voltage to brake for servo motor', to pin B9 of 'servo motor plug B'

Transverse lock, rear

Note. After successful read out the fault memory must be erased and after satisfying the diagnostic conditions below must be read out again!

1. 'Mechanical fault': mechanical wear in transverse lock

Transverse lock control unit plug

1. Pin '-'