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Home/Porsche/Cayenne/Porsche Cayenne I (2002-2007)/Repair manual/Differentials & Drive Axles/Transverse Interlock: Diagnosis
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Transverse Interlock: Diagnosis Porsche Cayenne I

Differentials & Drive Axles 1 illustration ~2692 words

Troubleshooting procedure

Troubleshooting can only be performed when the fault is present. In other words, Specific troubleshooting can only be performed in accordance with instructions (given under Diagnosis/troubleshooting for each fault code) if the entry has the status 'present' in the fault memory.

If the fault is currently 'not present', please check the following

  1. Diagnostic conditions are met
  2. All plug connections and ground points of the affected current path are OK.
  3. Observe the fault frequency counter in the Porsche System Tester II No. 9588 using the fault memory Info key [F8] under 'Extended fault memory' and draw conclusions about any loose contacts in the system.

Diagnostic conditions

Note. Important Always connect a suitable battery charging device to the vehicle electrical system battery before starting diagnosis. All unnecessary loads must also be switched off.

Note. The fault can only be identified if the requirements listed under 'Diagnostic conditions' are met. For this reason, the specified procedure must be observed after a fault is repaired

  1. Erase fault memory
  2. Satisfy the requirements listed under 'Diagnostic conditions'.
  3. Read out fault memory again

Diagnosis/troubleshooting

Note. The fault memory Info key [F8] on Porsche System Tester II No. 9588 can be used to access the 'extended fault memory'. The following information can be displayed

Diagnostic box in driver's footwell

PinDesignationPinDesignation
1Terminal 15 (fuse F52, fuse carrier at left of dashboard)9Not used
2Not used10Not used
3K' lead (communication with Tester)11Not used
4Ground12Not used
5Ground13Not used
6CAN high diagnosis (instrument cluster)14CAN low diagnosis (instrument cluster)
7K lead (OBD)15Not used
8Not used16Terminal 30 (fuse F7, fuse carrier at left of dashboard)

CONNECTOR TERMINALS REFERENCE CHART

Scheme 144

Scheme 144
Scheme 144
Work instructionDisplay OKIf not OK
1Check Porsche System Tester II No. 9588 connectionsCheck data link connector for the Porsche System Tester II No. 9588 is connected correctly to diagnostic box in vehicle. Check Porsche System Tester II No. 9588 connection cable for damage. Check function of Porsche System Tester II No. 9588 on another vehicle, if necessary.Go to Step 2Repair Porsche System Tester II No. 9588 --> End
2Check fuses and voltages present in fuse carrier at left of dashboardTerminal 30 power supply 'fuse F22' Terminal 15 voltage 'fuse F47'11.4 to 14.5 V Go to Step 3Replace any faulty fuse(s) (before doing so, check if correct fuse was used). If fuses are intact but there is no voltage, check wires and repair if necessary. If wires are intact, check fuse box and replace if faulty. --> End
3Check terminal 30 power supply to 'transverse lock control unit'Switch off ignition Pull off 'transverse lock control unit' plug Measure voltage between 'pin 46' and ground.11.4 to 14.5 V Go to Step 4Repair terminal 30 power supply to 'transverse lock control unit'. --> End
4Check terminal 15 power supply to 'transverse lock control unit'Switch on ignition Measure voltage between 'pin 41' and ground.11.4 to 14.5 V Go to Step 5Repair terminal 15 power supply to 'transverse lock control unit'. --> End
5Check terminal 31 ground supply for open circuitSwitch off ignition Measure resistance between 'pin 47' and ground.< 5 ohms Go to Step 6Between transverse lock control unit plug and 'body ground pin MB41_ring 2': Open circuit, contact resistance/corroded or loose connection at 'body ground pin MB41_ring 2'. Repair wire or fasten it to ground pin. --> End
6Check 'K-line' for short circuit to B+Switch on ignition Measure voltage between 'pin 7' of K-line on diagnostic box in the vehicle and ground.< 0.3 V Go to Step 7Repair K-line --> End
7Check 'K-line' for short circuit to groundSwitch off ignition Measure resistance between 'pin 7' of K-line on diagnostic box in vehicle and ground.Infinity ohms Go to Step 8Repair K-line --> End
8Check 'K-line' for open circuitMeasure resistance of K-line from 'pin 7' of diagnostic box in vehicle to 'pin 23' of transverse lock control unit plug.< 0.5 ohms Go to Step 9Repair K-line --> End
9CAN drive, check connection to 'transverse lock control unit'Refer to CHECKING INSTRUCTIONS/CAN DATA BUS .Only if CAN check is OK: Go to Step 10
10Replace transverse lock control unitNew 'transverse lock control unit' does not have to be coded! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Troubleshooting with no control unit connected

Note. Communication between the Porsche System Tester II No. 9588 and the 'transverse lock control unit' cannot be set up!

  1. Ignition on
  2. Fuses of the 'transverse lock control unit' are OK
  3. Battery voltage is OK
  4. Plug on 'transverse lock control unit' connected correctly
  5. Battery for Porsche System Tester II No. 9588 charged
  1. Ignition on
  2. Transverse lock control unit internal function test

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pin' of the transverse lock control unit plug connection and the 'pin' of the plug connections are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

Before carrying out the work instruction, please check fuse '22', terminal 30 power supply for the transverse lock control unit, in the fuse carrier at the left of the dashboard and replace it if necessary. After replacing the fuse, determine and remedy the cause of the fault in accordance with the work instruction below!

Work instructionDisplay OKIf not OK
1Check battery voltage/current and alternator charging voltage/currentEngine speed > 2,000 rpm. Measure charging voltage/current of generator.11.4 to 14.5 V Go to Step 2Charge battery if necessary, replace if faulty. Wiring/regulator or diodes faulty. Repair wires or generator. After carrying out repairs, erase fault memory and then read out fault memory again while observing diagnostic conditions. If no fault stored, then: --> End If fault reappears, then: Go to Step 2
2Check terminal 30 voltage supply and ground supply line to transverse lock control unitMeasurement '2a': Ignition off Pull plug off the transverse lock control unit Measure voltage between 'pin 46' of transverse lock control unit plug and ground.10.5 to 14.5 V go to measurement '2b'Check fuse '22' in fuse carrier at left of dashboard (resistance measurement). Check voltage supply line for short circuit to ground: Go to Step 3
Measurement '2b': Measure voltage between 'pin 47' of transverse lock control unit plug and battery terminal 30.10.5 to 14.5 V Go to Step 3Check ground supply line for short circuit to B+: Go to Step 3
3Check voltage supply line for short circuit to groundMeasurement '3a': Measure voltage between 'pin 46 and battery positive' of transverse lock control unit plug.< 0.3 V Measurement '3b'Short circuit to ground between transverse lock control unit plug leads 'pin 46 and fuse 22' in fuse carrier at left of dashboard. Repair wiring and replace faulty fuse. --> End
Check ground supply line for short circuit to B+Measurement '3b': Measure voltage between 'pin 47 and ground' of transverse lock control unit plug.< 0.3 V Go to Step 4Short circuit to B+ between transverse lock control unit plug leads 'pin 47' and ground pin MB41. Repair wiring. --> End
4Check for open circuit of terminal 30 voltage supply line and ground supply line for ground pin MB41Measure resistance on transverse lock control unit plug between 'pin 46 and fuse 22' in fuse carrier at left of dashboard. Measure resistance between 'pin 47' of transverse lock control unit plug and ground pin MB41.< 0.5 ohms Go to Step 5Open circuit in wire to fuse carrier at left of dashboard. Open circuit in wire to ground pin MB41. Repair wiring. Also check fuse. --> End
5Check terminal 30 voltage supply at fuseMeasure voltage between fuse plug '22 and body ground' in fuse carrier at left of dashboard.10.5 V to 14.5 V Go to Step 6Short circuit/contact resistance/corroded or loose connections near or in fuse carrier. Repair if possible, otherwise replace fuse carrier at left of dashboard. --> End
6Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. If there is no incoming signal/message via the CAN drive when using several control units, the CAN drive must be checked for open or short circuits. Refer to ' CHECKING INSTRUCTIONS/CAN DATA BUS '.

Work instructionDisplay OKIf not OK
1Read out fault memory for steering column switch (fault localization)For further fault localization, please follow the diagnosis/troubleshooting instructions for the PSM control unit, refer to the ANTI-LOCK BRAKE SYSTEM (ABS) article . The troubleshooting description '0778 Steering-angle sensor' from this must be used. --> End
2CHECKING INSTRUCTIONS/CAN DATA BUS .> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. If there is no incoming signal/message via the CAN drive when using several control units, the CAN drive must be checked for open or short circuits. Refer to ' CHECKING INSTRUCTIONS/CAN DATA BUS '.

Work instructionDisplay OKIf not OK
1Check DEM control module plug connection for proper contactGo to Step 2Push plug properly onto DME control module. --> End
2CHECKING INSTRUCTIONS/CAN DATA BUS .> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. If there is no incoming signal/message via the CAN drive when using several control units, the CAN drive must be checked for open or short circuits. Refer to CHECKING INSTRUCTIONS/CAN DATA BUS ' .

Work instructionDisplay OKIf not OK
1Check DEM control module plug connection for proper contactGo to Step 2Push plug properly onto DME control module. --> End
2Read out fault memory for DME control module (fault localization)To eliminate further faults, please follow the diagnosis/troubleshooting instructions for the DME control module, refer to the OBD (II) and FUEL SYSTEM, ELECTRONIC INJECTION articles . --> End
3CHECKING INSTRUCTIONS/CAN DATA BUS .> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test
  3. Vehicle speed greater than 0 km/h

Note. If there is no incoming signal/message via the CAN drive when using several control units, the CAN drive must be checked for open or short circuits. Refer to ' CHECKING INSTRUCTIONS/CAN DATA BUS '.

Work instructionDisplay OKIf not OK
1Read out fault memory for PSM control unit (fault localization)To eliminate further faults, please follow the diagnosis/troubleshooting instructions for the PSM control unit, refer to the ANTI-LOCK BRAKE SYSTEM (ABS) article . --> End
2CHECKING INSTRUCTIONS/CAN DATA BUS .> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. If there is no incoming signal/message via the CAN drive when using several control units, the CAN drive must be checked for open or short circuits. Refer to ' CHECKING INSTRUCTIONS/CAN DATA BUS '.

Work instructionDisplay OKIf not OK
1Read out instrument cluster fault memoryFor further troubleshooting, please follow the diagnosis instructions for the instrument cluster, refer to the INSTRUMENT CLUSTER article . --> End
2CHECKING INSTRUCTIONS/CAN DATA BUS .> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. Before replacing the control unit, the ground connections, power supply and plug connections on the control unit must be checked. After the test drive, read out the fault memory with the Porsche System Tester II No. 9588 again. Additional causes of faults that could damage the transverse lock control unit should be detected and remedied.

Work instructionDisplay OKIf not OK
1Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. Before replacing the control unit, the ground connections, power supply and plug connections on the control unit must be checked. After the test drive, read out the fault memory with the Porsche System Tester II No. 9588 again. Additional causes of faults that could damage the transverse lock control unit should be detected and remedied.

Work instructionDisplay OKIf not OK
1Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. Before replacing the control unit, the ground connections, power supply and plug connections on the control unit must be checked. After the test drive, read out the fault memory with the Porsche System Tester II No. 9588 again. Additional causes of faults that could damage the transverse lock control unit should be detected and remedied.

Work instructionDisplay OKIf not OK
1Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Note. The internal function test must be completed successfully before the functions stored in the transverse lock control unit can be activated.

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. Before replacing the control unit, the ground connections, power supply and plug connections on the control unit must be checked. After the test drive, read out the fault memory with the Porsche System Tester II No. 9588 again. Additional causes of faults that could damage the transverse lock control unit should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check transverse lock control unit plug connection for proper seating and contactGo to Step 2Connect plug properly to transverse lock control unit --> End
2Erase fault memory for transverse lock control unit and restart internal function test (ignition ON/test is performed automatically)> EndIf fault is repeated, then: Go to Step 3
3Replace transverse lock control unit> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit should be detected and remedied.

Troubleshooting fault type: 'short circuit to B+'

Work instructionDisplay OKIf not OK
1Check short circuit to B+Measurement '1a': Ignition off Pull plug off the transverse lock control unit Ignition on Measure voltage between 'pin 12' of transverse lock control unit plug and ground.< 0.3 V go to measurement '1b'Repair wiring harness to servo motor. --> End
Measurement '1b'; Ignition off Pull plugs 'A' and 'B' off servo motor Measure resistance between 'pin B3 and pins A1, A2' of servo motor plugs 'A and B'. Measure resistance between 'pin B3 and pins B5, B7, B10' of servo motor plug 'B'.Infinity ohms go to measurement '1c'Short circuit between servo motor leads. Go to Step 2
Measurement '1c': Measure resistance between 'pin 12' and 'pins 1, 15, 16, 21, 41, 46' of transverse lock control unit plug.Infinity ohms Go to Step 3Repair wiring harness to servo motor. --> End
2Replace transverse lock> End
3Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Troubleshooting fault type: 'short circuit to ground'

Work instructionDisplay OKIf not OK
1Check short circuit to groundMeasurement '1a': Ignition off Pull off transverse lock control unit plug Measure resistance between 'pin 12 and pins 2, 15, 16, 36, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 2Go to measurement '1b'
Measurement '1b'; Pull plugs 'A' and 'B' off servo motor Measure resistance between 'pin 12 and pins 2, 15, 16, 36, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 3Repair wiring harness to servo motor. --> End
2Check open circuitMeasurement '2a': Pull plug 'B' off servo motor Measure resistance between 'pin B3' and 'pin B1' of servo motor plug 'B'.1.1 to 2.2 kohms go to measurement '2b'Go to Step 3
Measurement '2b': Measure resistance between 'pin 12' of transverse box control unit plug and 'pin B3' of removed sensor plug 'B'.< 5 ohms Go to Step 4Repair wiring harness to servo motor. --> End
3Replace transverse lock> End
4Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check short circuit to B+Measurement '1a': Ignition off Pull plug off the transverse lock control unit Ignition on Measure voltage between 'pin 31' of transverse lock control unit plug and ground.< 0.3 V go to measurement 'lb'Repair wiring harness to servo motor. --> End
Measurement '1b'; Ignition off Pull plugs 'A' and 'B' off servo motor Measure resistance between 'pin B4 and pins Al, A2' of servo motor plugs 'A and B'. Measure resistance between 'pin B4 and pins B5, B7, B10' of servo motor plug 'B'.Infinity ohms go to measurement '1c'Short circuit between servo motor leads. Go to Step 2
Measurement '1c': Measure resistance between 'pin 31' and 'pins 1, 15, 16, 21, 41, 46' of transverse lock control unit plug.Infinity ohms Go to Step 3Repair wiring harness to servo motor. --> End
2Replace transverse lock> End
3Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Work instructionDisplay OKIf not OK
1Check short circuit to groundMeasurement 1a': Ignition off Pull off transverse lock control unit plug Measure resistance between 'pin 31 and pins 2, 15, 16, 36, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 2Go to measurement '1b'
Measurement 1b'; Pull plugs 'A' and 'B' off servo motor Measure resistance between 'pin 31 and pins 2, 15, 16, 36, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 3Repair wiring harness to servo motor. --> End
2Check open circuitMeasurement '2a': Pull plug 'B' off servo motor Measure resistance between 'pin B4' and 'pin B1' of servo motor plug 'B'.1.1 to 2.2 kohms go to measurement '2b'Go to Step 3
Measurement '2b': Measure resistance between 'pin 31' of transverse box control unit plug and 'pin B4' of removed sensor plug 'B'.< 5 ohms Go to Step 4Repair wiring harness to servo motor. --> End
3Replace transverse lock> End
4Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check power supply of potentiometerIgnition off Pull sensor plug 'B' off servo motor Ignition on Measure voltage at sensor plug 'B' (wiring harness side) between: 'pin B1 and pin B2', 'pin B5 and ground' and 'pin B7 and ground'.Approx. 5 V Go to Step 2, measurement '2a'Measured voltage > 5 V Go to Step 2, measurement '2b' Measured voltage < 5 V Go to Step 3
2Check short circuit to B+Measurement '2a': Ignition off Pull plug 'A' off servo motor Measure resistance at servo motor plugs 'A and B' between: 'pin B1 and pins A1, A2, B10', 'pin B5 and pins A1, A2, B10' and 'pin B7 and pins A1, A2, B10'Infinity ohms Measurement '2b'Short circuit between servo motor leads. Go to Step 4
Measurement '2b': Ignition off Pull plug 'A' off servo motor Pull plug off transverse lock control unit Ignition on Measure voltage between 'pins 1, 29, 43' of transverse lock control unit plug and ground.< 0.3 V Measurement '2c'Repair wiring harness to servo motor. --> End
Measurement '2c': Ignition off Measure resistance at transverse lock plug between 'pin 1 and pins 15, 16, 21, 41, 46', 'pin 29 and pins 15, 16, 21, 41, 46' and 'pin 43 and pins 15, 16, 21, 41, 46'.Infinity ohms Go to Step 5Repair wiring harness to servo motor. --> End
3Check short circuit to groundMeasurement '3a': Ignition off Measure resistance between 'pins 1, 29, 43' of transverse lock control unit plug and ground.Infinity ohms Go to Step 5Measurement '3b'
Measurement '3b': On servo motor, pull off sensor plug 'B' and servo motor plug 'A' Measure resistance between 'pins 1,29,43' of transverse lock control unit plug and ground.Infinity ohms Go to Step 4Repair wiring harness to servo motor. --> End
4Replace transverse lock> End
5Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test
  3. Engine running
  4. Selector lever position 'P'
  5. Engage transverse lock

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check fault memoryErase fault memory Check function of lock Read out fault memory againNo fault stored. --> EndGo to Step 2
2Replace servo motorErase fault memory Check function of lock Read out fault memory again> EndIf fault is not remedied by replacing the servo motor: Go to Step 3
3Replace control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. If there is no incoming signal/message via the CAN drive when using several control units, the CAN drive must be checked for open or short circuits. Refer to ' CHECKING INSTRUCTIONS/CAN DATA BUS '.

Work instructionDisplay OKIf not OK
1Check DEM control module plug connection for proper contactGo to Step 2Connect plug properly to transverse lock control unit --> End
2Read out fault memory for transfer box control unit (fault localization)To eliminate further faults, please follow the diagnosis/troubleshooting instructions for the transfer box control unit. . --> End
3CHECKING INSTRUCTIONS/CAN DATA BUS .> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test
  3. Engine running
  4. Selector lever position 'P'
  5. Engage transverse lock

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check short circuit to B+Measurement '1a': Ignition off Pull plug off transverse lock control unit Ignition on Measure voltage between 'pins 15, 16' of transverse lock control unit plug and ground.< 0.3 V go to measurement '1b'Repair wiring harness to servo motor. --> End
Measurement '1b'; Ignition off Push plug onto transverse lock control unit Pull plug 'A' off servo motor Ignition on Transverse lock not engaged Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and ground.< 0.3 V Short circuit between servo motor leads. Go to Step 2Go to Step 3
2Replace transverse lock> End
3Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Work instructionDisplay OKIf not OK
1Check short circuit to groundMeasurement '1a': Ignition off Pull off transverse lock control unit plug Measure resistance between 'pins 15, 16 and pins 2, 36, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 3Go to measurement '1b'
Measurement '1b'; Pull plugs 'A' and 'B' off servo motor Measure resistance between 'pins 15 and 16' and 'pins 15, 16 and pins 2, 36, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 2Repair wiring harness to servo motor. --> End
2Replace transverse lock> End
3Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Troubleshooting fault type: 'Open circuit/short circuit to ground'

Work instructionDisplay OKIf not OK
1Check short circuit to groundMeasurement '1a': Ignition off Pull plug 'A' off transverse lock servo motor Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and battery positive.< 0.3 V go to measurement '1c'Go to measurement '1b'
Measurement '1b'; Pull off transverse lock control unit plug Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and battery positive.< 0.3 V Go to Step 4Repair wiring harness to servo motor. --> End
Measurement '1c': Measure resistance between 'pins A1, A2 and ground' of servo motor plug 'A' (motor side).Infinity ohms Go to Step 2Go to Step 3
2Check open circuitMeasurement '2a': Measure resistance between 'pins A1 and A2' of servo motor plug 'A' (motor side).< 5 ohms go to measurement '2b'If 'infinity ohms' then: Go to Step 3
Measurement '2b': Pull off transverse lock control unit plug Measure resistance between 'pins 15, 16' of transverse lock control unit plug and 'pins A1, A2' of servo motor plug 'A' (wiring harness side).< 5 ohms Go to Step 4Repair wiring harness to servo motor. --> End
3Replace transverse lock> End
4Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Troubleshooting fault type: 'electrical fault in electric circuit'

Work instructionDisplay OKIf not OK
1Check short circuit to B+Measurement '1a': Ignition off Pull plug off transverse lock control unit Ignition on Measure voltage between 'pins 15, 16' of transverse lock control unit plug and ground.< 0.3 V go to measurement '1b'Repair wiring harness to servo motor. --> End
Measurement '1b'; Ignition off Push plug onto transverse lock control unit Pull plug 'A' off servo motor Ignition on Transverse lock not engaged Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and ground.< 0.3 V Go to Step 2Go to Step 5
2Check short circuit to groundMeasurement '2a': Ignition off Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and battery positive.< 0.3 V go to measurement '2c'Go to measurement '2b'
Measurement '2b': Pull off transverse lock control unit plug Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and battery positive.< 0.3 V Go to Step 5Repair wiring harness to servo motor. --> End
Measurement '2c': Pull off transverse lock control unit plug Measure resistance between 'pins A1, A2 and ground' of servo motor plug 'A' (motor side).Infinity ohms Go to Step 3Go to Step 4
3Check open circuitMeasurement '3a': Measure resistance between 'pins A1 and A2' of servo motor plug 'A' (motor side).< 5 ohms go to measurement '3b'If 'infinity ohms' then: Go to Step 4
Measurement '3b': Measure resistance between 'pins 15, 16' of transverse lock control unit plug and 'pins A1, A2' of servo motor plug 'A' (wiring harness side).< 5 ohms Go to Step 5Repair wiring harness to servo motor. --> End
4Replace transverse lock> End
5Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test
  3. Engine running
  4. Selector lever position 'P'
  5. Engage transverse lock

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check short circuit to B+Measurement '1a': Ignition off Pull plug off transverse lock control unit Ignition on Measure voltage between 'pins 15, 16' of transverse lock control unit plug and ground.< 0.3 V go to measurement '1b'Repair wiring harness to servo motor. --> End
Measurement '1b'; Ignition off Push plug onto transverse lock control unit Pull plug 'A' off servo motor Ignition on Transverse lock not engaged Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and ground.< 0.3 V Short circuit between servo motor leads. Go to Step 2Go to Step 3
2Replace transverse lock> End
3Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Work instructionDisplay OKIf not OK
1Check short circuit to groundMeasurement '1a': Ignition off Pull off transverse lock control unit plug Measure resistance between 'pins 15, 16 and pins 2, 36, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 3Go to measurement '1b'
Measurement '1b'; Pull plugs 'A' and 'B' off servo motor Measure resistance between 'pins 15 and 16' and 'pins 15, 16 and pins 2, 36, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 2Repair wiring harness to servo motor. --> End
2Replace transverse lock> End
3Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Work instructionDisplay OKIf not OK
1Check short circuit to groundMeasurement '1a': Ignition off Pull plug 'A' off transverse lock servo motor Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and battery positive.< 0.3 V go to measurement '1c'Go to measurement '1b'
Measurement '1b'; Pull off transverse lock control unit plug Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and battery positive.< 0.3 V Go to Step 4Repair wiring harness to servo motor. --> End
Measurement '1c': Measure resistance between 'pins A1, A2 and ground' of servo motor plug 'A' (motor side).Infinity ohms Go to Step 2Go to Step 3
2Check open circuitMeasurement '2a': Measure resistance between 'pins A1 and A2' of servo motor plug 'A' (motor side).< 5 ohms go to measurement '2b'If 'infinity ohms' then: Go to Step 3
Measurement '2b': Pull off transverse lock control unit plug Measure resistance between 'pins 15, 16' of transverse lock control unit plug and 'pins A1, A2' of servo motor plug 'A' (wiring harness side).< 5 ohms Go to Step 4Repair wiring harness to servo motor. --> End
3Replace transverse lock> End
4Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Work instructionDisplay OKIf not OK
1Check short circuit to B+Measurement '1a': Ignition off Pull plug off transverse lock control unit Ignition on Measure voltage between 'pins 15, 16' of transverse lock control unit plug and ground.< 0.3 V go to measurement '1b'Repair wiring harness to servo motor. --> End
Measurement '1b'; Ignition off Push plug onto transverse lock control unit Pull plug 'A' off servo motor Ignition on Transverse lock not engaged Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and ground.< 0.3 V Go to Step 2Go to Step 5
2Check short circuit to groundMeasurement '2a': Ignition off Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and battery positive.< 0.3 V go to measurement '2c'Go to measurement '2b'
Measurement '2b': Pull off transverse lock control unit plug Measure voltage between 'pins A1, A2' of servo motor plug 'A' (wiring harness side) and battery positive.< 0.3 V Go to Step 5Repair wiring harness to servo motor. --> End
Measurement '2c': Pull off transverse lock control unit plug Measure resistance between 'pins A1, A2 and ground' of servo motor plug 'A' (motor side).Infinity ohms Go to Step 3Go to Step 4
3Check open circuitMeasurement '3a': Measure resistance between 'pins A1 and A2' of servo motor plug 'A' (motor side).< 5 ohms go to measurement '3b'If 'infinity ohms' then: Go to Step 4
Measurement '3b': Measure resistance between 'pins 15, 16' of transverse lock control unit plug and 'pins A1, A2' of servo motor plug 'A' (wiring harness side).< 5 ohms Go to Step 5Repair wiring harness to servo motor. --> End
4Replace transverse lock> End
5Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test
  3. Engine running
  4. Selector lever position 'P'
  5. Engage transverse lock

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check short circuit to B+Measurement '1a': Ignition off Pull plug off transverse lock control unit Ignition on Measure voltage between 'pin 21' of transverse lock control unit plug and ground.< 0.3 V go to measurement '1b'Repair wiring harness to servo motor. --> End
Measurement '1b'; Ignition off Push plug onto transverse lock control unit Pull plug 'B' off servo motor Ignition on Measure voltage between 'pin B10' of servo motor plug 'B' (wiring harness side) and ground.< 0.3 V Short circuit between servo motor leads. Go to Step 2Go to Step 3
2Replace transverse lock> End
3Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Work instructionDisplay OKIf not OK
1Check short circuit to groundMeasurement '1a': Ignition off Pull off transverse lock control unit plug Measure resistance between 'pin 21 and pins 2, 15, 16, 36, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 2Go to measurement '1b'
Measurement '1b'; Pull plugs 'A' and 'B' off servo motor Measure resistance between 'pin 21 and pins 2, 15, 16, 36, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 3Repair wiring harness to servo motor. --> End
2Check open circuit/winding short circuitMeasurement '2a': Measure resistance between 'pin B10 and pin B9' of servo motor plug 'B'.Approx. 22 ohms at 25°C go to measurement '2b'Go to Step 3
Measurement '2b': Pull plug off transverse lock control unit Measure resistance between 'pins 21, 36' of transverse lock control unit plug and 'pins B9, B10' of servo motor plug 'B' (wiring harness side).< 5 ohms Go to Step 4Repair wiring harness to servo motor. --> End
3Replace transverse lock> End
4Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test
  3. Engine running
  4. Selector lever position 'P'
  5. Engage transverse lock

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check short circuit to B+Measurement '1a': Ignition off Pull plug off transverse lock control unit Ignition on Measure voltage between 'pin 36' of transverse lock control unit plug and ground.< 0.3 V go to measurement '1b'Repair wiring harness to servo motor. --> End
Measurement '1b'; Ignition off Push plug onto transverse lock control unit Pull plug 'B' off servo motor Ignition on Measure voltage between 'pin B9' of servo motor plug 'B' (wiring harness side) and ground.< 0.3 V Short circuit between servo motor leads. Go to Step 2Go to Step 3
2Replace transverse lock> End
3Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check voltage/ground supply of servo motor temperature sensorIgnition off Pull sensor plug 'B' off servo motor Ignition on Measure voltage between 'pins B5 and B6' of sensor plug 'B' (wiring harness side).Approx. 5 V Go to Step 2, measurement '2a'Measured voltage > 5 V Go to Step 2, measurement '2b' Measured voltage < 5 V Go to Step 3
2Check short circuit to B+Measurement '2a': Ignition off Pull plug 'A' off servo motor Measure resistance between 'pins B5, B6 and pins A1, A2, B10' of servo motor plugs 'A and B'.Infinity ohms Go to Step 3Short circuit between servo motor leads. Go to Step 4
Measurement '2b': Ignition off Pull plug 'A' off servo motor Pull plug off transverse lock control unit Ignition on Measure voltage between 'pins 29, 44' of transverse lock control unit plug and ground.< 0.3 V Measurement '2c'Repair wiring harness to servo motor. --> End
Measurement '2c': Ignition off Measure resistance between 'pins 29, 44 and pins 15, 16, 21' of transverse lock control unit plug.Infinity ohms Go to Step 5Repair wiring harness to servo motor. --> End
3Check open circuitMeasurement '3a': Measure resistance between 'pin B5' and 'pin B6' of servo motor plug 'B'.1.1 kohms at 21°C go to measurement '3b'Go to Step 4
Measurement '3b': Measure resistance between 'pins 29, 44' of transverse lock control unit plug and 'pins B5, B6' of removed sensor plug 'B'.< 5 ohms Go to Step 5Repair wiring harness to servo motor. --> End
4Replace transverse lock> End
5Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Work instructionDisplay OKIf not OK
1Check short circuit to groundMeasurement '1a': Ignition off Pull off transverse lock control unit plug Measure resistance between 'pin 29' of transverse lock control unit plug and ground.Infinity ohms Go to Step 3Measurement '1b'
Measurement '1b'; On servo motor, pull off sensor plug 'B' and servo motor plug 'A' Measure resistance between 'pin 29' of transverse lock control unit plug and ground.Infinity ohms Go to Step 2Repair wiring harness to servo motor. --> End
2Replace transverse lock> End
3Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test
  3. Vehicle stationary
  4. Engine running
  5. Brake actuated
  6. Selector lever position 'N'
  7. Via the left rocker switch on the 'selector switch (running gear control module)', alternately select the functions LOW RANGE and transverse lock LOW RANGE 100% (see Driver's Manual)
Work instructionDisplay OKIf not OK
1If the fault recurs after repeatedly erasing the fault memory, then: Repair/replace transverse lock> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check fault memoryErase fault memory Check function of lock Read out fault memory againIf only fault '2373' stored. Go to Step 2If, additionally, fault codes 2057 or 2058 stored, then diagnose/troubleshoot these codes. --> End
2Replace control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test
  3. Engine running
  4. Selector lever position 'P'
  5. Engage transverse lock

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

Work instructionDisplay OKIf not OK
1Check short circuit to B+Measurement '1a': Ignition off Pull plug off transverse lock control unit Ignition on Measure voltage between 'pins 21, 36' of transverse lock control unit plug and ground.< 0.3 V go to measurement '1b'Repair wiring harness to servo motor. --> End
Measurement '1b'; Ignition off Push plug onto transverse lock control unit Pull plug 'B' off servo motor Ignition on Transverse lock not engaged Measure voltage between 'pins B9, B10' of servo motor plug 'B' (wiring harness side) and ground.< 0.3 V Go to Step 2Go to Step 5
2Check short circuit to groundMeasurement '2a': Ignition off Measure voltage between 'pin B10' of transverse lock servo motor plug 'B' (wiring harness side) and battery positive.< 0.3 V go to measurement '2c'Go to measurement '2b'
Measurement '2b': Pull off transverse lock control unit plug Measure resistance between 'pin 21 and pins 2, 15, 16, 44, 47' of transverse lock control unit plug.Infinity ohms Go to Step 5Repair wiring harness to servo motor. --> End
Measurement '2c': Measure resistance between 'pin B10 and ground' of servo motor plug 'B'.Infinity ohms Go to Step 3Go to Step 4
3Check open circuit/winding short circuitMeasurement '3a': Measure resistance between 'pin B10 and pin B9' of servo motor plug 'B'.Approx. 22 ohms at 25°C go to measurement '3b'Go to Step 4
Measurement '3b': Pull plug off transverse lock control unit Measure resistance between 'pins 21, 36' of transverse lock control unit plug and 'pins B9, B10' of servo motor plug 'B' (wiring harness side).< 5 ohms Go to Step 5Repair wiring harness to servo motor. --> End
4Replace transverse lock> End
5Replace transverse lock control unitPlease see above note on replacing control units! --> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Troubleshooting for fault type: 'mechanical fault'

Work instructionDisplay OKIf not OK
1Replace transverse lock> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

  1. Ignition on
  2. Transverse lock control unit internal function test
  3. Vehicle stationary
  4. Engine running
  5. Brake actuated
  6. Selector lever position 'N'
  7. Via the left rocker switch on the 'selector switch (running gear control module)', alternately select the functions LOW RANGE and transverse lock LOW RANGE 100% (see Driver's Manual)
Work instructionDisplay OKIf not OK
1If the fault recurs after repeatedly erasing the fault memory, then: Repair/replace transverse lock> End

DIAGNOSIS TROUBLESHOOTING PROCEDURE

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