Controls and Operating
3-49
Fault-
Code
(hex/dec)
SPN FMI MEANING OF THE FAULT CODEpos-
sible reason for fault detection
Reaction of the TCU Possible steps to
repair
Remarks
• temperature sensor has an internal
defect
• connector pin is contacted to vehicle
ground
27 / 39 5120 3 S.C. TO BATTERY VOLTAGE OR O.C.
AT RETARDER / TORQUE
CONVERTER TEMPERATURE
SENSOR INPUT
the measured voltage is too high:
• cable is defective and is contacted to
battery voltage
• cable has no connection to TCU
• temperature sensor has an internal
defect
• connector pin is contacted to battery
voltage or is broken
no reaction,
TCU uses default temperature
OP-Mode: normal
• check the cable from
TCU to the sensor
• check the connectors
• check the
temperature sensor
28 / 40 5120 4 S.C. TO GROUND AT RETARDER /
TORQUE CONVERTER
TEMPERATURE SENSOR INPUT
the measured voltage is too low:
• cable is defective and is contacted to
vehicle ground
• temperature sensor has an internal
defect
• connector pin is contacted to vehicle
ground
no reaction,
TCU uses default temperature
OP-Mode: normal
• check the cable from
TCU to the sensor
• check the connectors
• check the
temperature sensor
29 / 41 5130 3 S.C. TO BATTERY VOLTAGE OR O.C.
AT PARKING BRAKE SENSOR INPUT
the measured voltage is too high:
• cable is defective and is contacted to
battery voltage
• cable has no connection to TCU
• sensor has an internal defect
• connector pin is contacted to battery
voltage or is broken
TCU uses default value
OP-Mode: normal
• check the cable from
TCU to the sensor
• check the connectors
• check the parking
brake sensor
2A / 42 5130 4 S.C. TO GROUND PARKING BRAKE
SENSOR INPUT
the measured voltage is too low:
• cable is defective and is contacted to
vehicle ground
• sensor has an internal defect
• connector pin is contacted to vehicle
ground
TCU uses default value
OP-Mode: normal
• check the cable from
TCU to the sensor
• check the connectors
• check the parking
brake sensor
2B / 43 5313 12 INCHSENSOR-SIGNAL MISMATCH
the measured voltage from CCO and
CCO2 signal don’t match or out of range
• cable is defective
• sensor has an internal defect
During inching mode: TCU shifts
to neutral
While not inching: no change
OP-Mode: normal
• check the cable from
TCU to the sensor
• check the connectors
• check sensor
31/ 49 5140 3 S.C. TO BATTERY VOLTAGE OR O.C.
AT ENGINE SPEED INPUT
TCU measures a voltage higher than
7.00 V at speed input pin
• cable is defective and is contacted to
battery voltage
• cable has no connection to TCU
• speed sensor has an internal defect
• connector pin is contacted to battery
voltage or has no contact
OP-Mode: substitute clutch
control
• check the cable from
TCU to the sensor
• check the connectors
• check the speed
sensor
32 / 50 5140 4 S.C. TO GROUND AT ENGINE SPEED
INPUT TCU measures a voltage less
than 0.45V at speed input pin
• cable / connector is defective and is
contacted to vehicle ground
• speed sensor has an internal defect
OP-Mode: substitute clutch
control
• check the cable from
TCU to the sensor
• check the connectors
• check the speed
sensor
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