Daewoo Mega 500-V - Definition of Operating Modes; Limp-Home; Normal; Substitute Clutch Control

S0607900C
Page 8
Transmission Error Codes (ZF)
DEFINITION OF OPERATING MODES
NORMAL
There is no failure detected in transmission system or failure has no or slight effects on transmission
control. TCU will work without or in special cases with little limitations. (See “Table of Fault Codes” on page
10.)
SUBSTITUTE CLUTCH CONTROL
TCU cannot change gears or direction under control of normal clutch modulation. TCU uses substitute
strategy for clutch control. All modulations are only time controlled. (Comparable with EST 25.)
LIMP-HOME
The detected failure in the system has strong limitations to transmission control. TCU can engage only one
gear in each direction. In some cases only one direction will be possible.
TCU will shift the transmission into neutral at the first occurrence of the failure. First, the operator must shift
the gear selector into neutral position.
If output speed is less than a threshold for neutral to gear and the operator shifts the gear selector into
forward or reverse, the TCU will select the limp-home gear.
If output speed is less than a threshold for reversal speed and TCU has changed into the limp-home gear
and the operator selects a shuttle shift, TCU will shift immediately into the limp-home gear of the selected
direction.
If output speed is greater than the threshold, TCU will shift the transmission into neutral. The operator has
to slow down the vehicle and must shift the gear selector into neutral position.
TRANSMISSION SHUT DOWN
TCU has detected a severe failure that disables control of the transmission.
TCU will shut off the solenoid valves for the clutches and also the common power supply (VPS1).
Transmission shifts to Neutral. The park brake will operate normally, also the other functions which use
ADM 1 to ADM 6.
The operator has to slow down the vehicle. The transmission will stay in neutral.
TCU SHUT DOWN
TCU has detected a severe failure that disables control of system.
TCU will shut off all solenoid valves and also both common power supplies (VPS1, VPS2). The park brake
will engage, also all functions are disabled which use ADM 1 to ADM 6.
The transmission will stay in neutral.
NOTE: VPS2: is the LIS (option power supply).