DTC Logic

DTC DETECTION LOGIC

Diagnosis Procedure

1.CHECK VACUUM HOSES AND VACUUM GALLERY

1. Turn ignition switch OFF.

2. Check vacuum hoses and vacuum gallery for clogging, cracks or improper connection. Refer to EC-825, "TURBOCHARGER BOOST CONTROL : Vacuum Hose Drawing".

Is the inspection result normal? Yes >> Repair or replace.

No >> GO TO 2.

2.CHECK AIR FILTER

Check that air filter is not obstructed.

Is the inspection result normal? Yes >> Repair or replace.

No >> GO TO 3.

3.CHECK INTAKE AIR DUCT

Check that intake air duct is not obstructed.

Is the inspection result normal? Yes >> Repair or replace.

No >> GO TO 4.

4.CHECK VACUUM PUMP

Check vacuum pump.

Is the inspection result normal? Yes >> Repair or replace.

No >> GO TO 5.

5.CHECK TURBOCHARGER

Check turbocharger.

Is the inspection result normal? Yes >> Repair or replace.

No >> GO TO 6.

6.CHECK EGR COOLER BYPASS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1. Disconnect EGR cooler bypass control solenoid valve harness connector.

2. Turn ignition switch ON.

3. Check the voltage between EGR cooler bypass control solenoid valve harness connector and ground.

Is the inspection result normal? YES >> GO TO 8.

NO >> GO TO 7.

7.DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E8, F1 • Harness for open or short between IPDM E/R and EGR cooler bypass control solenoid valve

>> Repair open circuit or short to ground or short to power in harness or connectors.

8.CHECK EGR COOLER BYPASS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between EGR cooler bypass control solenoid valve harness connector and ECM harness connector.

4. Also check harness for short to ground and short to power.

Is the inspection result normal? YES >> GO TO 9.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

9.CHECK EGR COOLER BYPASS CONTROL SOLENOID VALVE

Refer to EC-894, "Component Inspection".

Is the inspection result normal? YES >> GO TO 10.

NO >> Replace turbocharger boost control solenoid valve.

10.CHECK TURBOCHARGER BOOST SENSOR

Refer to EC-912, "Component Inspection".

Is the inspection result normal? YES >> GO TO 11.

NO >> Replace turbocharger boost sensor.

11.CHECK THROTTLE CONTROL MOTOR

Refer to EC-998, "Component Inspection".

Is the inspection result normal? YES >> GO TO 12.

NO >> Replace electric throttle control actuator.

12.CHECK INTERMITTENT INCIDENT

Refer to GI-42, "Intermittent Incident", ???INCIDENT SIMULATION TESTS??? and ???GROUND INSPECTION???.

>> INSPECTION END