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Fault code
Meaning of the fault code
(Hex)
possible reason for fault detection
BB
Slippage at converter lockup clutch
TCU calculates a differential speed at
closed converter lockup clutch.
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 brake solenoid
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
BE
S.C. to battery voltage at engine brake
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
BF
O.C. at engine brake
TCU detected a wrong voltage at the
output pin, that looks like a O.C. for this
output pin
Cable is defective and has no
connection to TCU
Engine brake solenoid has an internal
defect
Connector has no connection to TCU
Reaction of the TCU
-
If this
No reaction
OP mode : Normal
No reaction
OP mode : Normal
No reaction
OP mode : Normal
3-31
Possible steps to repair
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
Check the cable from TCU to
engine brake solenoid
Check the connectors from engine
brake solenoid to TCU
Check the resistance* of engine
brake solenoid
* See page 3-36
Check the cable from TCU to the
engine brake solenoid
Check the connectors from engine
brake solenoid to TCU
Check the resistance* of engine
brake solenoid
* See page 3-36
Check the cable from TCU to the
engine brake solenoid
Check the connectors from engine
brake solenoid to TCU
Check the resistance* of engine
brake solenoid
* See page 3-36
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