D1
S
.
C
.
TO BATTERY VOLTAGE AT
POWER SUPPLY FOR SENSORS
TCU measures more than 6V
at the pin AU1 (5V sensor
supply)
see fault codes no. 21 to
2C
check cables and
connectors to sensors,
which are supplied
from AU1
check the power
supply at the pin AU1
(should be appx. 5V)
fault codes no. 21 to no.
2C may be a reaction of
this fault
D2
S
.
C
.
TO GROUND AT POWER
SUPPLY FOR SENSORS
TCU measures less than 4V
at the pin AU1 (5V sensor
supply)
see fault codes no. 21 to
2C
check cables and
connectors to sensors,
which are supplied
from AU1
check the power
supply at the pin AU1
(should be appx. 5V)
fault codes no. 21 to no.
2C may be a reaction of
this fault
D3
LOW POWER AT BATTERY
measured voltage at power
supply is lower than xx V
shift to neutral
OP-Mode: TCU
shutdown
check power supply
battery
check cables from
batteries to TCU
check connectors from
batteries to TCU
D4
HIGH POWER AT BATTERY
measured voltage at power
supply is higher than xx V
shift to neutral
OP-Mode: TCU
shutdown
check power supply
battery
check cables from
batteries to TCU
check connectors from
batteries to TCU
D5
ERROR AT SWITCH
1
FOR
VALVE POWER SUPPLY
VPS1
TCU switched on VPS1 and
measured VPS1 is off or
TCU switched off VPS1 and
measured VPS1 is still on
cable or connectors are
defect and are contacted
to battery voltage
cable or connectors are
defect and are contacted
to vehicle ground
permanent power supply
KL30 missing
TCU has an internal
defect
shift to neutral
OP-Mode: TCU
shutdown
check fuse
check cables from
gearbox to TCU
check connectors from
gearbox to TCU
replace TCU
D6
ERROR AT SWITCH
2
FOR
VALVE POWER SUPPLY
VPS2
TCU switched on VPS2 and
measured VPS2 is off or
TCU switched off VPS2 and
measured VPS2 is still on
cable or connectors are
defect and are contacted
to battery voltage
cable or connectors are
defect and are contacted
to vehicle ground
permanent power supply
KL30 missing
TCU has an internal
defect
shift to neutral
OP-Mode: TCU
shutdown
check fuse
check cables from
gearbox to TCU
check connectors from
gearbox to TCU
replace TCU
Fault
Code
(hex)
MEANING OF THE FAULT
CODE
Possible reason for fault
detection
Reaction of the
TCU
Possible steps
to repair
Remarks
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