4.
Read "DTC Status" parameter.
If any codes relating to injectors, HO2S, ECT(Engine Coolant Temperature)Sensor, Throttle Position sensor, Injectors or Mass Air Flow Sensor are stored, do ALL REPAIRS associated with those codes before proceeding with this troubleshooting tree.
Connect GDS and select "DTC Analysis" mode.
Select “Diagnostic Trouble Codes(DTC)” button, Press "DTC Status" to check DTC's information from the DTCs menu.
Confirm that "DTC Readiness Flag" indicates "COMPLETED". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
Read "DTC Status" parameter.
Record all DTC’s, DTC status and freeze frame data. Does DTC Status indicate “Present”?
- History (Not Present) fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.
 | ▶ Go to next step as below. |
 | ▶ Fault is intermittent caused by poor contact in the sensor's and/or PCM/ECM's connector or was repaired and PCM/ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure. |
The main purpose of this test is to identify potential engine mechanical condition problems and fuel and ignition systems problems that are not common to all cylinders. For best results, perform this test while maintaining as steady an rpm reading as possible.
Before beginning tests; set the parking brake, place gear selector in P or N and block drive wheels for safety.
Warm up the engine to normal operating temperature and let it idle.
Install GDS and select "INJECTOR #1" parameter on the Actuation Test mode shown in the figure.
Monitor engine rpm and shut off the injector #1 by pressing "START" key.
Repeat procedure on all injectors and record the engine rpm.
Specification : All cylinders should show an even RPM drop.
Was each cylinder's rpm drop within the same value?
| ▶ Go to next step as below. |
| ▶ Cylinders with the least amount of RPM drop are not contributing their share of power. Go to "Fuel System Inspection" procedure. note If the RPM loss between cylinders is quite large(200RPM or more) and engine has high mileage, there is possibility of engine wear. Perform compression test with pressure gauge to check the engine wear. |
