Operation and maintenance manual

Section 120-0010
21
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)
BE
S.C. TO BATTERY VOLTAGE AT ENGINE BRAKE no reaction •check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that OP-mode: normal engine brake solenoid
looks like a s.c. to battery voltage •check connectors from
• cable is defective and is contacted to battery voltage engine brake solenoid
• engine brake solenoid has an internal defect to TCU
• connector pin is contacted to battery voltage •check the resistance
1)
of
engine brake solenoid
BF
O.C. AT ENGINE BRAKE no reaction •check cable from TCU to
1)
see figure 8
TCU detected a wrong voltage at the output pin, that OP-mode: normal engine brake solenoid
looks like a o.c. for this output pin •check connectors from
• cable is defective and has no connection to TCU engine brake solenoid
• engine brake solenoid has an internal defect to TCU
• connector has no connection to TCU •check the resistance
1)
of
engine brake solenoid
C3
OVERTEMP TORQUE CONVERTOR OUTPUT no reaction •cool down machine
TCU measured an oil temperature at the OP-mode: normal •check oil level
converter output that is over the allowed threshold •check temperature
sensor
CA
ENGINE_RETARDER CONFIG_TIMEOUT OP-mode: substitute •check EEC controller
Timeout of CAN message clutch control •check wire of CAN-Bus
ENGINE_RETARDER CONFIG from EEC •check cable to EEC
controller controller
• inteference on CAN-Bus
• CAN wire/connector is broken
• CAN wire/connector is defective and has contact
to vehicle ground or battery voltage
CB
ERC1TIMEOUT OP-mode: substitute •check EEC controller
Timeout of CAN-message ERC1 from EEC clutch control •check wire of CAN-Bus
controller •check cable to EEC
• inteference on CAN-Bus controller
• CAN wire/connector is broken
• CAN wire/connector is defective and has contact
to vehicle ground or battery voltage
D1
S.C.TO BATTERY VOLTAGE AT POWER SUPPLY FOR SENSORS see fault codes no. 21 •check cables and fault codes no. 21
TCU measures more than 6V at the pin AU1 to no. 2C connectors to sensors, to no. 2C may be
(5V sensor supply) which are supplied a reaction of this
from AU1 fault
•check power supply at
pin AU1 (should be
approx. 5V)
D2
S.C.TO GROUND AT POWER SUPPLY FOR SENSORS see fault codes no. 21 •check cables and fault codes no. 21
TCU measures less than 4V at the pin AU1 to no. 2C connectors to sensors, to no. 2C may be
(5V sensor supply) which are supplied a reaction of this
from AU1 fault
•check power supply at
pin AU1 (should be
approx. 5V)
D3
LOW POWER AT BATTERY shift to neutral •check power supply
measured voltage at power supply is lower OP-Mode: TCU shutdown battery
than 18 V •check cables from
batteries to TCU
•check connectors from
batteries to TCU
D4
HIGH POWER AT BATTERY shift to neutral •check power supply
measured voltage at power supply is higher OP-Mode: TCU shutdown battery
than 32.5 V •check cables from
batteries to TCU
•check connectors from
batteries to TCU