Transfer Box (VG)

Fault Code 2039

Potentiometer, transfer box

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

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

Possible causes of fault
- 'Short circuit to B+': signal line of potentiometer '1/2' (sensor 1/ 2) short circuit to B+ (12 V)
- 'Short circuit to B+': transfer box control unit faulty
- 'Open circuit/short circuit to ground': signal line of potentiometer '1/2' (sensor 1/2) open circuit or short circuit to ground
- 'Short circuit to ground': potentiometer faulty
- 'Open circuit/short circuit to ground': transfer box control unit faulty
- 'Implausible signal': potentiometer faulty

Affected pins
Transfer box control module plug:
- Pin 12 'input signal to potentiometer 1 (sensor 1)', from pin B5 of 'servo motor sensor plug'
- Pin 31 'input signal to potentiometer 2 (sensor 2)', from pin B8 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 module. After the test drive, read out the fault memory with the 9588 Porsche System Tester II again. Additional causes of faults that could damage the 'transfer box control unit' should be detected and remedied.

Troubleshooting fault type: 'short circuit to B+'







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







Troubleshooting for fault type: 'implausible signal'