Transfer Box
Fault code 2038Voltage 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.
Diagnostic conditions
- Ignition on
- Internal 'transfer box control unit' function test
Possible causes of fault
- 'Above upper limit': voltage supply line (5 V) short circuit to B+ (12 V)
- 'Above upper limit': transfer box control unit faulty
- 'Below lower limit': voltage supply line (5 V) short circuit to ground
- 'Below lower limit': transfer box control unit faulty
Affected pins
Transfer box control unit plug:
- Pin 1 'potentiometer 1 (sensor 1) 5 V' to pin B4 of 'servo motor sensor plug'
- Pin 18 'potentiometer 2 (sensor 2) 5 V' to pin B1O of 'servo motor sensor plug'
- Pin 29 'voltage supply (5 V) for servo motor temperature sensor to pin B6 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.
NOTE:
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 II No 9588. Additional causes of faults that could damage the transfer box control unit should be detected and remedied.
