P17A4

5A45 - P17A4

Information saved in
GS

Fault code
5A45 - P17A4

Fault text
DKG: Clutch 2: incorrect pressure

Fault description
Clutch 2 Hydraulic Circuit Pressure Too Low

Condition for fault identification
Test condition:
Pressure signal OK
Cut-off not switched to reservoir
The pressure operates in open-loop or closed-loop mode
(i.e., not current control)
-The driver circuit has not been deactivated
Terminal condition: Terminal 15 ON
Voltage condition:
UBat > 10V

Condition for fault memory entry
interpolated
200 ms (> 0 ° C)
400 ms (< -30 ° C)

Action in service
Precondition: Engine off
1st step: Read out raw data [clutch 1 pressure sensor,
clutch 2 pressure sensor]
Tolerance range:
0.2 bar < pressure < 1.8 bar If error is sporadic: Delete
diagnostic fault code, road test. The assess diagnostic fault
codes stored in ECU fault memory.
1st step: Case 1: Pressure in one of the / both clutches
outside tolerance range 2nd step: Defective pressure
sensor(s)
Replace E-module
1st step: Case 2: Pressure in both clutches within tolerance
range 2nd step: additional diagnostic fault code 0x5A5A
logged?
2nd step: Case 1: Fault present 3rd step: Continue repair
at 0x5A5A using test plan
Precondition: Both transmission units in neutral, engine
running
2nd step: Case 2: Fault not present 3rd step: Read out
fault category
3rd step: Error type 0, 2, 4 (undefined, charging time or
pressure too low)
Run through pressure analysis three times:
Test procedures
'Test_Druck_Leck1_01 '
'Test_Druck_Leck2_01 '
'Test_Druck_Sys15_01 '
'Test_Druck_Sysmax_01 '
3rd step: Case 1: All indices <= 1 4th step: Delete
diagnostic fault code
3rd step: Case 2: At least one index > 1 4th step: - Replace
transmission
3rd step: Fault category 8 (pressure too high):
Possible damage to clutch 2 from excessive pressure.
Read out frequency counter (diagnostic fault code
0x5A44)
Assessment 4th step: Perform service functions 'Learn
clutch/ PV2' + 'Learn kiss-point'
4th step: Case 1: Service functions executed without
problems 5th step: Delete diagnostic fault code, road test.
4th step: Case 2: Error during service functions 5th step:
Repair according to service function

Fault effect and breakdown warning
none

Driver information
Warning light:
ID 365/ 'Transmission malfunction! Drive gently'
Limp-home mode:
Gears 2, 4, 6 locked out (clutch circuit 2 disabled)

Service instruction
none