Section 120-0010
Transmission - Transmission and Mounting
SM 1965 4-00
20
Fault MEANING OF CODE TCU reaction Checks Remarks
Code possible reason for fault detection
(hex)
BB SLIPPAGE AT CONVERTER LOCKUP CLUTCH •check pressure at
TCU calculates a differential speed at closed converter converter lockup clutch
lockup clutch. If this calculated value is out of range, •check main pressure in the
TCU interprets this as slipping clutch. system
•
low pressure at converter lockup clutch •check sensor gap at engine
•
low main pressure speed sensor
•
wrong signal at engine speed sensor •check sensor gap at turbine
•
wrong signal at turbine speed sensor speed sensor
•
wrong size of the sensor gap •check signal at engine
•
clutch is defective speed sensor
•check signal at turbine
speed sensor
•replace clutch
BD S.C. TO GROUND AT ENGINE BRAKE SOLENOID no reaction •check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that OP-mode: normal engine brake solenoid
looks like a s.c. to vehicle ground •check connectors from
•
cable is defective and is contacted to vehicle ground engine brake solenoid
•
engine brake solenoid has an internal defect to TCU
•
connector pin is contacted to vehicle ground •check the resistance
1)
of
engine brake solenoid
BE S.C. TO BATTERY VOLTAGE AT ENGINE BRAKE no reaction •check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that OP-mode: normal engine brake solenoid
looks like a s.c. to battery voltage •check connectors from
•
cable is defective and is contacted to battery voltage engine brake solenoid
•
engine brake solenoid has an internal defect to TCU
•
connector pin is contacted to battery voltage •check the resistance
1)
of
engine brake solenoid
BF O.C. AT ENGINE BRAKE no reaction •check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that OP-mode: normal engine brake solenoid
looks like a o.c. for this output pin •check connectors from
•
cable is defective and has no connection to TCU engine brake solenoid
•
engine brake solenoid has an internal defect to TCU
•
connector has no connection to TCU •check the resistance
1)
of
engine brake solenoid
D1 S.C. TO BATTERY VOLTAGE AT POWER SUPPLY FOR SENSORS see fault codes no. 21 •check cables and fault codes no. 21
TCU measures more than 6V at the pin AU1 to no. 2C connectors to sensors, to no. 2C may be
(5V sensor supply) which are supplied a reaction of this
from AU1 fault
•check power supply at
pin AU1 (should be
approx. 5V)
D2 S.C. TO GROUND AT POWER SUPPLY FOR SENSORS see fault codes no. 21 •check cables and fault codes no. 21
TCU measures less than 4V at the pin AU1 to no. 2C connectors to sensors, to no. 2C may be
(5V sensor supply) which are supplied a reaction of this
from AU1 fault
•check power supply at
pin AU1 (should be
approx. 5V)
D3 LOW POWER AT BATTERY shift to neutral •check power supply
measured voltage at power supply is lower OP-Mode: TCU shutdown battery
than 18 V •check cables from
batteries to TCU
•check connectors from
batteries to TCU
D4 HIGH POWER AT BATTERY shift to neutral •check power supply
measured voltage at power supply is higher OP-Mode: TCU shutdown battery
than 32.5 V •check cables from
batteries to TCU
•check connectors from
batteries to TCU
Courtesy of Machine.Market
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