Terracan (HP) 4H and 4WD low operates, Intermittently

Model: Terracan ( HP )	Model year: 2004	Mileage: 11720 km
Displacement: 2900cc	Fuel: Diesel	T/A All

Subject: Abnormal operation of EGR Vacuum hose

1) Condition:

• 4H and 4WD low operates improperly,intermittent.

2) Cause:

• Malfunction of EGR vacuum hose check valve.

3) Diagnosis:

1. Scan tool check
   = No trouble code.
2. When operating the 4WD switch, the indicator lamp illuminates.
   ( 2H- 4H-4WD low)
3. Check with the vehicle being lifted, the front wheel shaft from T/F (transfer) does not operates.
4. CADS actuator does not operates (CADS-Center axle Disconnect System).
   If normal, it moves Approx 3cm to the right side.
5. When changing from 2H to 4H, 5 seconds later the ECM displays 12V and the CADS solenoid displays 12V.

4) Repair Guide:

1. Replace the EGR (Exhaust Gas Recirculation) vacuum hose check valve.
   ( Part #: 39430-4x430)
2. If DTC code displays related to 4WD or the warning lamps illuminates, check whether the CADS actuator operates normally or not.
3. more study  &please leave comments