Section 120-0010
Transmission - Transmission and Mounting
SM 1965 4-00
18
Fault
MEANING OF CODE
TCU reaction
Checks
Remarks
Code
possible reason for fault detection
(hex)
A1
S
.
C
.
TO
GROUND
AT
DIFFLOCK
SOLENOID
no reaction
•
check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that
OP-Mode: normal
difflock solenoid
looks like a s.c. to vehicle ground
•
check connectors from
•
cable is defective and is contacted to vehicle ground
difflock solenoid to TCU
•
difflock solenoid has an internal defect
•
check resistance
1)
of
•
connector pin is contacted to vehicle ground
difflock solenoid
A2
S
.
C
.
TO
BATTERY
VOLTAGE
AT
DIFFLOCK
SOLENOID
no reaction
•
check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that
OP-Mode: normal
difflock solenoid
looks like a s.c. to battery voltage
•
check connectors from
•
cable is defective and is contacted to battery voltage
difflock solenoid to TCU
•
difflock solenoid has an internal defect
•
check resistance
1)
of
•
connector pin is contacted to battery voltage
difflock solenoid
A3
O
.
C
.
AT
DIFFLOCK
SOLENOID
no reaction
•
check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that
OP-Mode: normal
difflock solenoid
looks like a o.c. for this output pin
•
check connectors from
•
cable is defective and has no connection to TCU
difflock solenoid to TCU
•
difflock solenoid has an internal defect
•
check resistance
1)
of
•
connector has no connection to TCU
difflock solenoid
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
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