Work Procedure 1
Procedure and repair measures in the event of fault entries in the fault memory of the PDK control unitWork Procedure:
1 Procedure and repair measures in the event of fault entries in the fault memory of the PDK control unit.
The required procedure for correcting faults for the groups of fault memory entries listed below is described using flow charts.
A separate flow chart is used for each of the fault groups specified below.
Information
You will find the flow charts under the heading "3730 - Flow charts of PDK fault codes (970)" in the information medium TI - Technical Information releases, main group 3 - Transmission.
In addition to the flow charts, Guided Fault Finding in PIWIS Tester II must always be used during troubleshooting for existing fault memory entries. In some cases, you are directed to the required guided fault finding from the flow charts. The procedure for required electric testing is stored only under Guided Fault Finding in PIWIS Tester II.
Sequence for correcting faults if various fault entries from various fault groups are present:
1) Electrical faults
2) Sensor faults/software faults
3) Gear selection faults
Fault correction for complaints relating to comfort and noise must only be carried out after the faults listed above (if present) have been found and corrected.
1.1 Electrical faults
Electrical faults include all fault memory entries relating to fault type
- Short circuit to ground
- Short circuit to B+
- Shunt
- Open circuit
- Incorrect voltage (operating limit, low-voltage, over-voltage).
Correct faults as shown in Flow chart EF - Electrical faults.
1.2 Sensor faults/software faults
"Sensor faults" include all fault memory entries relating to the components
^ Distance sensor
^ Speed sensor
^ Pressure sensor
^ Temperature sensor.
Correct faults as shown in Flow chart SF0 - SF5.
Overview of fault memory entries for distance sensor (Flow chart SF1)
- P1731 ... to P1734: Distance sensor information/shift rod faults (outside of validity range)
Overview of fault memory entries for speed sensor (Flow chart SF2)
- P0730: Transmission monitoring symptom - incorrect gear ratio
- P1743: Plausibility of transmission input shaft speed sensor clutch 1
- P1744: Plausibility of transmission input shaft speed sensor clutch 2
- P1745: Input shaft overspeed
Overview of fault memory entries for pressure sensor (Flow chart SF3)
- P0841, P0846 and P0871: Pressure sensor fault (measured value implausible)
- P17B1 and P17B2: Clutch fault (activation pressure implausible)
- P17B3 and P17B4: Clutch valve fault (valve pressure stays too high mechanically during overlap switching after quick filling)
- P17BB ... to P17BE: Clutch fault (clutch cannot be opened)
Overview of fault memory entries for temperature sensor (Flow chart SF4)
- P0711: Transmission temperature sensor implausible
- P172D: Transmission temperature sensor gradient fault
- P17F0 to P17F2: Transmission over temperature
Overview of fault memory entries for software faults (Flow chart SF5)
- P0602: PDK control unit not programmed
- P0603 ... to P605: PDK control unit, internal fault
- P0614: Data status does not match engine
- P0702: PDK control unit, internal fault
- P1715: PDK control unit, internal fault
- P1749: PDK control unit, variant coding invalid
- P174B: PDK control unit, interchange detected
- P174C: BIN file does not match software version
- P174E: EEPROM content at system start incorrect/implausible
- P186F ... to P1872: PDK control unit, internal fault (electric synchronization data, shift rod compensation, clutches and hydraulics)
- P1897, P189A, P189C, P189D: PDK control unit, internal fault (software monitoring)
- P18A0 ... to P18B5: PDK control unit, internal fault (software monitoring)
- P18D0: Clutch, BIN file implausible
- Uxxxx: CAN fault
1.3 Overview of fault memory entries for gear selection
- P17D0 ... to 17D9: Hydraulic gear selection, system fault
- P1779, P177A ... to P177F: Synchronization fault - gear cannot be disengaged (disengagement block)
Other fault entries relating to the fault memory entries specified above that can be entered in the fault memory of the PDK control unit.
- P18B4: PDK control unit, internal fault (software monitoring) with fault type $36/$37/$38
Correct faults as shown in Flow chart GS.
Repair measures in the event of leaks on the PDK transmission
Information
General information on how to deal with leaks on the PDK transmission
The exact site of the leak must be determined in order to be able to define the required repair measures. If this is not possible at first, carry out the following steps one after the other:
- Clean the transmission
- Perform a test drive
- Check the transmission for leaks and find the leak.
Once you have found the leak, carry out the required repair measures in accordance with the following overview.
Once you have repaired the leak, always check the transmission fluid level and correct it if necessary --> 370235 Checking and topping up ATF.