Poor acceleration – EGR solenoid valve/Terracan(HP)

this may help you on how to trouble shoot and give knowledge if this trouble occur into your own automobile.

model: Terracan  (HP)	Yearmodel: 2004	mileage: 80269km
Displacement: 2900cc	Fuel: Diesel	T/A: All
N code: Rough idling	C code: others	System: Exhaust Emission Control System

1) Trouble and Condition:

1. With a warm or cold engine, when accelerating, improper black exhuast gas comes out.
2. Poor acceleration when driving on hilly road.

2) Trouble Cause:

1. the EGR solenoid valve operates all the time.
2. At idle, the EGR solenoid valve operates.

3) Trouble Diagnosis:

1. Scan tool check
   = Diagnosis trouble code,
   C1604 = ECM circuit malfunction.
2. Inspect with the wiring shaken.
3. C1604 can be displayed by either hardware malfunction or wheel speed sensor contact malfunction (ECM circuit malfunction).
4. When C1604 displays; before replacing the ECM and modulator check the wheel speed sensor.
5. Check the leakage and damage of the EGR solenoid valve vacuum hose.= No trouble found.
6. Inspect the amount of engine oil. Ok
7. Inspect the A/C element condition = No trouble found.
8. Check the current data for the AUTO T/A = No trouble found.
9. Inspect the vacuum condition of the EGR S/VALVE, the vacuum does not appear frequently = No trouble is found with the power ON.
10. While inspect the vacuum condition , the vacuum fails to form but leakage occurs.

4) Trouble Repair Guide:

1. Replace the EGR S/VALVE ASS’Y.
2. When there is a problem with improper exhaust gas, check the color of the gas first.
3. When vehicle have problem with lack of fuel and contaminate elements, the desame symptom might be reproduce. 
4. MORE STUDY