Transverse Interlock

Fault Code 2059

Servo motor temperature sensor

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

Diagnostic conditions
- Ignition on
- Internal transfer box control unit function test

Possible causes of fault
- 'Open circuit/short circuit to B+': short circuit to B+ (12 V) in the voltage supply (5 V)/ground supply wiring
- 'Open circuit/short circuit to B+': open circuit in the voltage supply (5 V)/ground supply wiring
- 'Short circuit to ground': short circuit to ground in the voltage supply (5 V)/ground supply wiring
- 'Above upper limit': short circuit to B+ (12 V) in the voltage supply (5 V) wiring
- 'Above upper limit', servo motor temperature sensor faulty

Affected pins
Transfer box control unit plug:
- Pin 29 'voltage supply (5V) for servo motor temperature sensor' to pin B6 of 'servo motor sensor plug'
- Pin 44 'ground for servo motor temperature sensor' to pin B7 of 'servo motor sensor plug'

Diagnosis/troubleshooting

NOTE:
- Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transfer box 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.
- Control unit replacement: Before replacing the 'transfer box 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 1/ No. 9588. Additional causes of faults that could damage the 'transfer box control unit' should be detected and remedied.

Troubleshooting fault type: 'Open circuit/short circuit to B+' and 'above upper limit'







Troubleshooting fault type: 'short circuit to ground'