BB
SLIPPAGE AT CONVERTER
LOCKUP CLUTCH
TCU calculates a differential
speed at closed converter
lockup clutch. If this
calculated value is out of
range, TCU interprets this as
slipping clutch.
low pressure at converter
lockup clutch
low main pressure
wrong signal at engine
speed sensor
wrong signal at turbine
speed sensor
wrong size of the sensor
gap
clutch is defective
BD
S.C. TO GROUND AT ENGINE
B
RKAE
S
OLENOID
TCU detected a wrong
voltage at the output pin,
that looks like a s.c. to
vehicle ground
cable is defective and is
contacted to vehicle
ground
engine brake solenoid
has an internal defect
connector pin is
contacted to vehicle
ground
Noreaction
OP-mode: normal
Check the cable from
TCU to the engine
brake solenoid
check the connectors
from difflock solenoid
to TCU
check the resistance
1)
of difflock solenoid
1)
see chapter 4
BE
S
.
C
.
TO BATTERY VOLTAGE AT
E
NGINE
B
RAKE
TCU detected a wrong
voltage at the output pin,
that looks like a s.c. to
battery voltage
cable is defective and is
contacted to battery
voltage
engine brake solenoid
has an internal defect
connector pin is
contacted to battery
voltage
Noreaction
OP-mode: normal
Check the cable from
TCU to the engine
brake solenoid
check the connectors
from engine brake
solenoid to TCU
check the resistance
1)
of engine brake
solenoid
1)
see chapter 4
Fault
Code
(hex)
MEANING OF THE FAULT
CODE
Possible reason for fault
detection
Reaction of the
TCU
Possible steps
to repair
Remarks
BC
OVERSPEED OUTPUT
TCU messures an trans-
mission output speed above
the defined threshold
No reaction
OP-Mode: normal
Check pressure at
converter lockup clutch
Check main pressure in
the system
Check sensor gap at
engine speed sensor
Check sensor gap at
turbine speed sensor
Check signal at engine
speed sensor
Check signal at turbine
speed sensor
Replace clutch
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