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TROUBLE DIAGNOSIS TEST
Shift Motor Test
• Check short and open for circuit before and during shifting.
• 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.
• 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.
Transmission System Timeout Test
• Shift timeout occurs when the position sensor of shift motor does not try to operate, which happens 1.5 seconds
after completion of 2H-4H shift and 3 seconds after completion of 4H-4L shift.
• When the timeout occurs, TCCU cuts off the voltage to shift motor and operates the compensation mode.
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
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. If the shift motor is in operation, the shift operation completes, however, TCCU stops operation until ignition
switch is turned to "ON" again.
• When the rear speed sensor is restored continuously for 0.5 seconds, TCCU operates normally and the "4WD
CHECK" warning lamp goes out but the trouble code is stored into memory.
Clutch Coil Test
1. Check the clutch coil for open and short circuit.
2. When the system detects a fault in shift motor for over 0.8 seconds, "4WD CHECK" warning lamp comes on and
the trouble code is stored into memory.
PART TIME
REXTON SM - 2004.4
3D-19
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
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