Self Diagnosis Test - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

TROUBLE DIAGNOSIS
TCCU periodically monitors the input and output while the system is in operation. When a fault is detected, the trouble
code is stored into TCCU memory.
If the ignition switch is turned to "OFF", TCCU stops monitoring for input and output, however, when the ignition switch
is turned to "OFF" before shifting completes, TCCU continues monitoring for input and output required for the shifting.

SELF DIAGNOSIS TEST

Shift Motor Test
When TOD control unit detects a fault in shift motor or position encoder for over 1 second, "4WD CHECK" warning lamp
comes on and the trouble code is stored into memory.
• Shift motor fault occurs when the motor is in "OFF" state:
- short to ground in motor HI-LO circuit
- short to ground in motor LO-HI circuit
- open in motor circuit
• Shift motor fault occurs when the motor is in normal operation state:
- short to ground in motor HI-LO circuit
- short to ground in motor LO-HI circuit
- short between motor LO-HI and motor HI-LO circuit
- open in motor circuit
• Position encoder fault occur when
- Detected unmatched code with 9 valid position codes
- An encoder circuit is short to ground
• When the fault occurs before the shift operation is started, the TOD control unit does not respond to any shift
command.
• When, after receiving shift command, the fault occurs without any operation, the TOD control unit cancels the
command and does not respond to any following shift command.
• If TOD control unit, even while shift command is in progress, detects an invalid position code, it stops the operation
and turns motor to "HIGH" position. After then, TOD control unit does not respond to any shift command.
• When the shift motor and position encoder assembly fault (fault other than motor fault that is caused when normal
power supply is applied) is restored continuously for 1 second, the TOD control unit function becomes normal. At
this time, "4WD CHECK" warning lamp comes on but the trouble code is stored into memory.
• The trouble code being detected in shift motor during its operation is defined as timeout.
• The trouble code for shift motor can be erased by using scanner.
Position Encoder Test
• When the system detects a fault in shift motor for over 1 second, "4WD CHECK" warning lamp comes on and the
trouble code is stored into memory.
• Position encoder fault can be divided into general encoder fault and short to ground of position encoder circuit.
- General encoder fault: Invalid position code input
- Short to ground of position encoder circuit: Ground for encoder circuit
TOD
REXTON SM - 2004.4
3E-23
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN