5A72 - P1892 (EGS)

5A72 - P1892

Information saved in
GS

Fault code
5A72 - P1892

Fault text
DKG: Sensor, supply voltage: faulty

Fault description
System Voltage Low

Condition for fault identification
Test condition:
Terminal 15 ON
Terminal condition: Terminal 15 ON
Voltage condition:
UBat > 10V

Condition for fault memory entry
100 ms internal diagnosis

Action in service
1st step: Assess frequency
1st step: Case 1: Frequency = 1 and fault not continuously
active 2nd step: Delete fault
1st step: Case 2: Frequency > 1 or fault active continuously
2nd step: Power-supply voltage readout (vehicle
electrical system)
STATUS_ISTWERTE_LESEN [STAT_UBAT_WERT]
Specified: 9V < U < 18V
Precondition: Engine running
2nd step: Start engine
Readout power-supply voltage (vehicle electrical system)
STATUS_ISTWERTE_LESEN [STAT_UBAT_WERT]
Specified: 10V < U < 18V
2nd step: Assess fault category
2nd step: Case 1: 0x01 Power-supply voltage above
specified limit 3rd step: Notice: It is possible that an
external power source has been connected (e.g., jump start)
2nd step: Case 2: 0x02 Power-supply voltage below
specified limit
or
0x08 Voltage is implausible 3rd step: Perform energy
diagnosis on vehicle (if energy diagnosis has already been
performed with no problems found, continue with Case 2)
3rd step: Case 1: Vehicle electrical system as source of
power-supply voltage problem 4th step: Delete
diagnostic fault code
3rd step: Case 2: Vehicle electrical system OK. 4th step:
Use current-flow diagram to check power-supply voltage to
transmission in E-box
Use current-flow diagram to check power-supply voltage
to transmission (take measurements on wires, checks
contacts and pins)
Case 1: Wiring not OK
Replace/repair wiring harness
Case 2: Wiring OK
Replace transmission If fault is sporadic:
4th step: IMPORTANT!: Deactivate additional error path
pending release of individual components (internal wiring
harness, mechatronic module, E-module).
Open transmission (using Repair Manual), check continuity
in wiring harness and inspect contacts
Case 1: If wiring harness is defective, replace it
Case 2: Wiring harness OK, then replace E-module

Fault effect and breakdown warning
none

Driver information
Warning light:
No
limp-home mode:
??? (FB_SG_VersS_01)

Service instruction
none