S0607900C
Page 28
Transmission Error Codes (ZF)
B6 Slippage at clutch KR.
TCU calculates a differential
speed at closed clutch KR. If
this calculated value is out of
range, TCU interprets this as
slipping clutch.
• Low pressure at clutch KR.
• Low main pressure.
• Wrong signal at internal
speed sensor.
• Wrong signal at turbine
speed sensor.
• Sensor gap is incorrect.
• Clutch is defective.
TCU shifts to neutral.
OP-Mode: limp
home.
If failure at another
clutch is pending.
TCU shifts to neutral.
OP-Mode: TCU shut
down.
Check pressure at
clutch KR.
Check main
pressure in system.
Check sensor gap at
internal speed
sensor.
Check sensor gap at
turbine speed
sensor.
Check signal at
internal speed
sensor.
Check signal at
turbine speed
sensor.
Replace clutch.
---------------
B7 Overtemp sump.
TCU measured a temperature
in oil sump that is over
allowed threshold.
No reaction.
OP-Mode: normal.
Cool down machine.
Check oil level.
Check temperature
sensor.
---------------
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 - 2C.
Check cables and
connectors to
sensors, which are
supplied from AU1.
Check the power
supply at the pin AU1
(should be
approximately 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 - 2C.
Check cables and
connectors to
sensors, which are
supplied from AU1.
Check the power
supply at the pin AU1
(should be
approximately 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 18 V.
Shift to neutral.
OP-Mode: TCU shut
down.
Check power supply
battery.
Check cables from
batteries to TCU.
Check connectors
from batteries to
TCU.
---------------
Fault
Code
(hex)
Meaning of the Fault Code
(Possible reason for fault
detection.)
Reaction of the
TCU
Possible Steps to
Repair
Remarks
* Only Mega 400-III PLUS
** Only Series "V"
Gray shaded boxes are error codes for other applications. They are only given for general reference purposes.
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