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Fault code
Meaning of the fault code
(Hex)
possible reason for fault detection
28
S.C. to ground at retarder 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
29
S.C. to battery voltage or O.C. at
converter output 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
30
S.C. to ground at converter output
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
31
S.C. to battery voltage or O.C. at engine
speed input
TCU measures a voltage higher than
7.00V 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
32
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
Reaction of the TCU
No reaction, TCU uses default
temperature
OP mode : Normal
No reaction, TCU uses default
temperature
OP mode : Normal
No reaction, TCU uses default
temperature
OP mode : Normal
OP mode : Substitute clutch
control
OP mode : Substitute clutch
control
3-18
Possible steps to repair
Check the cable from TCU to the
sensor
Check the connectors
Check the temperature sensor
Check the cable from TCU to the
sensor
Check the connectors
Check the temperature sensor
Check the cable from TCU to the
sensor
Check the connectors
Check the temperature sensor
Check the cable from TCU to the
sensor
Check the connectors
Check the speed sensor
Check the cable from TCU to the
sensor
Check the connectors
Check the speed sensor
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