Terex TA30 Maintenance Manual page 88

Transmission - Transmission and Mounting
Section 120-0010
Fault MEANING OF CODE
Code possible reason for fault detection
(hex)
A1 . .
S C TO GROUND AT DIFFLOCK 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
• difflock solenoid has an internal defect
• connector pin is contacted to vehicle ground
A2 . .
S C TO BATTERY VOLTAGE AT DIFFLOCK SOLENOID
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
• difflock solenoid has an internal defect
• connector pin is contacted to battery voltage
A3 . .
O C AT DIFFLOCK SOLENOID
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
• difflock solenoid has an internal defect
• connector has no connection to TCU
A4 . .
S C TO GROUND AT WARNING SIGNAL OUTPUT
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
• warning device has an internal defect
• connector pin is contacted to vehicle ground
A5 . .
O C AT WARNING SIGNAL OUTPUT
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
• warning device has an internal defect
• connector has no connection to TCU
A6 . .
S C TO BATTERY VOLTAGE AT WARNING SIGNAL OUTPUT
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
• warning device has an internal defect
• connector pin is contacted to battery voltage
B1 K1
SLIPPAGE AT CLUTCH
TCU calculates a differential speed at closed clutch K1.
If this calculated value is out of range, TCU interprets
this as slipping clutch.
• low pressure at clutch K1
• low main pressure
• wrong signal at internal speed sensor
• wrong signal at output speed sensor
• wrong size of the sensor gap
• clutch is defective
B2 K2
SLIPPAGE AT CLUTCH
TCU calculates a differential speed at closed clutch K2.
If this calculated value is out of range, TCU interprets
this as slipping clutch.
• low pressure at clutch K2
• low main pressure
• wrong signal at internal speed sensor
• wrong signal at output speed sensor
• wrong size of the sensor gap
• clutch is defective
18
TCU reaction Checks
•check cable from TCU to
no reaction
OP-Mode: normal difflock solenoid
•check connectors from
difflock solenoid to TCU
•check resistance
difflock solenoid
•check cable from TCU to
no reaction
OP-Mode: normal difflock solenoid
•check connectors from
difflock solenoid to TCU
•check resistance
difflock solenoid
•check cable from TCU to
no reaction
OP-Mode: normal difflock solenoid
•check connectors from
difflock solenoid to TCU
•check resistance
difflock solenoid
•check cable from TCU to
no reaction
OP-Mode: normal warning device
•check connectors from
warning device to TCU
•check resistance
warning device
•check cable from TCU to
no reaction
OP-Mode: normal warning device
•check connectors from
warning device to TCU
•check resistance
warning device
•check cable from TCU to
no reaction
OP-Mode: normal warning device
•check connectors from
warning device to TCU
•check resistance
warning device
•check pressure at clutch K1
TCU shifts to neutral
•check main press. in system
OP-Mode: limp home
•check sensor gap at internal
if failure at another
clutch is pending speed sensor
•check sensor gap at output
TCU shifts to neutral
OP-Mode: TCU shutdown speed sensor
•check signal at internal
speed sensor
•check signal at output
speed sensor
•replace clutch
•check pressure at clutch K2
TCU shifts to neutral
•check main press. in system
OP-Mode: limp home
•check sensor gap at internal
if failure at another
clutch is pending speed sensor
•check sensor gap at output
TCU shifts to neutral
OP-Mode: TCU shutdown speed sensor
•check signal at internal
speed sensor
•check signal at output
speed sensor
•replace clutch
Remarks
1)
see figure 8
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of
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see figure 8
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see figure 8
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of
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see figure 8
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1) see figure 8
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SM 1965 4-00
Courtesy of Machine.Market