Operation and maintenance manual

Section 120-0010
19
SM 2124 Rev 3 8-03
Transmission - Transmission and Mounting
Fault MEANING OF CODE TCU reaction Checks Remarks
Code possible reason for fault detection
(hex)
A4
S.C. TO GROUND AT WARNING SIGNAL OUTPUT no reaction •check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that OP-Mode: normal warning device
looks like a s.c. to vehicle ground •check connectors from
• cable is defective and is contacted to vehicle ground warning device to TCU
• warning device has an internal defect •check resistance
1)
of
• connector pin is contacted to vehicle ground warning device
A5
O.C. AT WARNING SIGNAL OUTPUT no reaction •check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that OP-Mode: normal warning device
looks like a o.c. for this output pin •check connectors from
• cable is defective and has no connection to TCU warning device to TCU
• warning device has an internal defect •check resistance
1)
of
• connector has no connection to TCU warning device
A6
S.C. TO BATTERY VOLTAGE AT WARNING SIGNAL OUTPUT no reaction •check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that OP-Mode: normal warning device
looks like a s.c. to battery voltage •check connectors from
• cable is defective and is contacted to battery voltage warning device to TCU
• warning device has an internal defect •check resistance
1)
of
• connector pin is contacted to battery voltage warning device
B1
SLIPPAGE AT CLUTCH K1 TCU shifts to neutral •check pressure at clutch K1
TCU calculates a differential speed at closed clutch K1. 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 K1 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
B2
SLIPPAGE AT CLUTCH K2 TCU shifts to neutral •check pressure at clutch K2
TCU calculates a differential speed at closed clutch K2. 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 K2 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
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