4. Plotting Snapshot Graph

This test selects several necessary items from the data list to plot graphs and makes data comparison on a long term basis. It is an effective test particularly in emission related evaluations.

For trouble diagnosis, you can collect graphic data (snap shot) directly from the vehicle.

You can replay the snapshot data as needed. Therefore, accurate diagnosis is possible, even though the vehicle is not available.

System Check At Tech 2:

System Check at Tech 2

General Description
1. Turn on the ignition and check the check engine lamp. If it is not turned on, execute Miscellaneous Test at Tech 2. (Refer to "Miscellaneous Test") and if problems are found, repair a blown bulb or a short circuit.
2. Ignition on, engine on. Check flashing check engine lamp. If it keeps flashing, Check Diagnosis Trouble Code (DTC) at Tech 2.

CHECK POINT:
- Kind of DTC
- Which is current DTC or history.
- Recording freeze frame data in Tech 2.
- DTC history
- "F1: MIL SVS or Message Request" at Tech 2
- DTC at Current Ignition cycle

3. When the lamp don't turn on, Check a DTC at Tech 2 too.

CHECK POINT:
- Kind of DTC
- Which is current DTC or history.
- Recording freeze frame data in Tech 2.
- DTC history
- "F3: Test Failed Since Code Cleared" at Tech 2.
- DTC at Current ignition cycle

4. Case DTC stored at PCM
Record the DTC and the freeze frame data and flash it.
After reappear the trouble from the freeze frame data.
Check power supply circuits, ground circuits, and signal circuit.

CHECK POINT:
- Which is mechanical trouble or electrical trouble.
- Snapshot the engine data at the Tech 2. and observe variation of the any data, faulty data, fixed data and etc.

5. Case DTC did not store at PCM

CHECK POINT:
- Which is mechanical trouble or electrical trouble.
- Snapshot the engine data at the Tech 2. and observe variation of the any data, faulty data, fixed data and etc.

CHECK POINT:
1. A systematic error is caused by a low accuracy of electric items.
2. A random error is caused by electric trouble. It is disturbance and mechanical trouble.
3. A fixed error is caused by broken electric item, open circuit, short circuit.

Step 1 - 6:

Step 7 - 8:

Step 9 - 10:

Step 11:

Step 12 - 13:

System Check at the Tech 2

Ploting Graph Flow Chart (Ploting Graph After Obtaining Vehicle Information):

Plotting Graph Flow Chart (Plotting graph after obtaining vehicle information)




Flow Chart for Snapshot Replay (Plotting Graph)