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Fault code
Meaning of the fault code
(Hex)
possible reason for fault detection
D1
S.C. to battery voltage at power supply
for sensors
TCU measures more than 6V at the pin
AU1 (5V sensor supply)
D2
S.C. to ground at power supply for
sensors
TCU measures less than 4V at the pin
AU1 (5V sensor supply)
D3
Low voltage at battery
Measured voltage at power supply is lower
than 18V(24V device)
D4
High voltage at battery
Measured voltage at power supply is
higher than 32.5V(24V device)
D5
Error at 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
D6
E
E
rror at 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
Reaction of the TCU
See fault codes No.21 to 2C
See fault codes No.21 to 2C
Shift to neutral
OP mode : TCU shutdown
Shift to neutral
OP mode : TCU shutdown
Shift to neutral
OP mode : TCU shutdown
Shift to neutral
OP mode : TCU shutdown
3-33
Possible steps to repair
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 reaction of this fault
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 reaction of this fault
Check power supply battery
Check cables from batteries to
TCU
Check connectors from batteries
to TCU
Check power supply battery
Check cables from batteries to
TCU
Check connectors from batteries
to TCU
Check fuse
Check cables from gearbox to
TCU
Check connectors from gearbox to
TCU
Replace TCU
Check fuse
Check cables from gearbox to
TCU
Check connectors from gearbox to
TCU
Replace TCU
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