Front Sensor Speed Test; All Troubles From Speed Sensor; Emc Test - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

3E-24

Front Sensor Speed Test

When the system detects a fault from front speed sensor for over 0.5 second, "4WD CHECK" warning lamp comes on.
At this time, the responds from TOD control unit are as follows:
• If the system is in "4H" state, the TOD control unit uses rear speed sensor value to determine the amount of EMC
touch off and the wheel slip control stops.
• If the system is in "4L" state, the EMC duty cycle is set at maximum value (according to the vehicle speed) until
system stops "4L" operation.
• All electrical shift operations are stopped until ignition switch is cycled from "OFF" to "ON" position. Any shift
operation in progress completes the process. When the front speed sensor is restored continuously for 0.5 seconds,
the TOD control unit becomes normal status. At this time, "4WD CHECK" warning lamp comes on but the trouble
code still remains in the memory.
Rear Speed Sensor Test
When the system detects a fault from rear speed sensor for over 0.5 second, "4WD CHECK" warning lamp comes on.
At this time, the responds from TOD control unit are as follows:
• If the system is in "4H" state, the TOD control unit uses front speed sensor value to determine the amount of EMC
touch off and the wheel slip control stops.
• If the system is in "4L" state, the EMC duty cycle is set at maximum value (according to the vehicle speed) until
system stops "4L" operation.
• All electrical shift operations are stopped until ignition switch is cycled from "OFF" to "ON" position. Any shift
operation in progress completes the process. When the rear speed sensor is restored continuously for 0.5 seconds,
the TOD control unit becomes normal status. At this time, "4WD CHECK" warning lamp comes on but the trouble
code still remains in the memory.

All Troubles From Speed Sensor

When the system detects a fault from front and rear speed sensors for 0.5 seconds, "4WD CHECK" warning lamp
comes on. At this time, the responds from TOD control unit are as follows:
• If the system is in "4H" state, the TOD control unit is set up based on EMC touch off amount and the wheel slip
control stops.
• If the system is in "4L" state, the EMC duty cycle is set at maximum value (according to the vehicle speed) until
system stops "4L" operation.
• All electrical shift operations are stopped until ignition switch is cycled from "OFF" to "ON" position. Any shift
operation in progress completes the process. When the rear speed sensor is restored continuously for 0.5 seconds,
the TOD control unit becomes normal status. At this time, "4WD CHECK" warning lamp comes on but the trouble
code still remains in the memory.

EMC Test

The EMC tests whether the circuit is short or open to ground. When the system detects a fault for 0.8 seconds, "4WD
CHECK" warning lamp comes on and TOD stops its operation. When the EMC is restored continuously for 0.8 seconds,
the TOD control unit functions normally. At this time, "4WD CHECK" warning lamp comes on but the trouble code still
remains in the memory.
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
TOD
REXTON SM - 2004.4