Section 120-0010
19
SM 1965 4-00
Transmission - Transmission and Mounting
Fault MEANING OF CODE TCU reaction Checks Remarks
Code possible reason for fault detection
(hex)
B3 SLIPPAGE AT CLUTCH K3 TCU shifts to neutral •check pressure at clutch K3
TCU calculates a differential speed at closed clutch K3. OP-Mode: limp home •check main press. in system
If this calculated value is out of range, TCU interprets if failure at another •check sensor gap at internal
this as slipping clutch. clutch is pending speed sensor
•
low pressure at clutch K3 TCU shifts to neutral •check sensor gap at output
•
low main pressure OP-Mode: TCU shutdown speed sensor
•
wrong signal at internal speed sensor •check signal at internal
•
wrong signal at output speed sensor speed sensor
•
wrong size of the sensor gap •check signal at output
•
clutch is defective speed sensor
•replace clutch
B4 SLIPPAGE AT CLUTCH K4 TCU shifts to neutral •check pressure at clutch K4
TCU calculates a differential speed at closed clutch K4. OP-Mode: limp home •check main press. in system
If this calculated value is out of range, TCU interprets if failure at another •check sensor gap at internal
this as slipping clutch. clutch is pending speed sensor
•
low pressure at clutch K4 TCU shifts to neutral •check sensor gap at turbine
•
low main pressure OP-Mode: TCU shutdown speed sensor
•
wrong signal at internal speed sensor •check signal at internal
•
wrong signal at turbine speed sensor speed sensor
•
wrong size of the sensor gap •check signal at turbine
•
clutch is defective speed sensor
•replace clutch
B5 SLIPPAGE AT CLUTCH KV TCU shifts to neutral •check pressure at clutch KV
TCU calculates a differential speed at closed clutch KV. OP-Mode: limp home •check main press. in system
If this calculated value is out of range, TCU interprets if failure at another •check sensor gap at internal
this as slipping clutch. clutch is pending speed sensor
•
low pressure at clutch KV TCU shifts to neutral •check sensor gap at turbine
•
low main pressure OP-Mode: TCU shutdown speed sensor
•
wrong signal at internal speed sensor •check signal at internal
•
wrong signal at turbine speed sensor speed sensor
•
wrong size of the sensor gap •check signal at turbine
•
clutch is defective speed sensor
•replace clutch
B6 SLIPPAGE AT CLUTCH KR TCU shifts to neutral •check pressure at clutch KR
TCU calculates a differential speed at closed clutch KR. OP-Mode: limp home •check main press. in system
If this calculated value is out of range, TCU interprets if failure at another •check sensor gap at internal
this as slipping clutch. clutch is pending speed sensor
•
low pressure at clutch KR TCU shifts to neutral •check sensor gap at turbine
•
low main pressure OP-Mode: TCU shutdown speed sensor
•
wrong signal at internal speed sensor •check signal at internal
•
wrong signal at turbine speed sensor speed sensor
•
wrong size of the sensor gap •check signal at turbine
•
clutch is defective speed sensor
•replace clutch
B7 OVERTEMP SUMP no reaction •cool down machine
TCU measured a temperature in the oil sump that is OP-Mode: normal •check oil level
TCU measured a temperature in the oil sump that is OP-Mode: normal •check oil level
over the allowed threshold. •check temperature sensor
B8 OVERTEMP RETARDER TCU disables retarder •cool down machine
TCU measured a temperature in the retarder oil that is OP-Mode: normal •check oil level
over the allowed threshold. •check temperature sensor
B9 OVERSPEED ENGINE retarder applies - not used
OP-Mode: normal
BA DIFFERENTIAL PRESSURE OIL FILTER no reaction •check oil filter
TCU measured a voltage at differential pressure switch OP-Mode: normal •check wiring from TCU to
out of the allowed range. differential pressure switch
•
oil filter is polluted •check differential pressure
•
cable/connector is broken or cable/connector is switch (measure resistance)
contacted to battery voltage or vehicle ground
•
differential pressure switch is defective
Courtesy of Machine.Market
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