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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
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
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
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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