Fault Code 1871

Fault code 1871

Rocker switch (steering column switch)

NOTE: The ignition must be switched off and then switched on again in order to display a fault indication in the instrument cluster.

Use the 'Actual values' menu in the Porsche System Tester II No. 9588 to check the transmission status and the actual values of the shift solenoid valves and sensors.

Diagnostic conditions
- Ignition on
- Internal Tiptronic control unit function test
- Operate rocker switch during driving

Possible causes of fault
- 'implausible signal'

Affected pins
Tiptronic control unit plug:
- Pin 34 'CAN drive (low)'
- Pin 46 'CAN drive (high)'

Diagnosis/troubleshooting G 0210

NOTE:
Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' on the Tiptronic control unit plug connection and the 'pins' on the 'existing transmission wiring' plug connection are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

NOTE:
Control unit replacement: Before replacing the 'Tiptronic 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 'Tiptronic control unit' should be detected and remedied.