Flow of Diagnosis

TROUBLESHOOTING
GENERAL NOTES

A problem with the EC-AT may be caused by the engine, the EC-AT powertrain, the hydraulic control system, or the electronic control system.
When troubleshooting, therefore, begin from these points, which can be inspected quickly and easily. The recommended troubleshooting sequence is described below.

Step 1: On-board Diagnosis System Inspection
Check for diagnostic trouble code(s) memorized in the powertrain control module (Transmission) with the Self- Diagnosis Checker.

Note:
- You can also check the flashing sequence of the hold indicator light for diagnostic trouble code(s).





Step 2: Mechanical System Test
Check the engine stall speed, time lag, and line pressure.





Step 3: Road Test
Check the shift point, shift schedule, and shift shock.

If the 3 steps are followed, the cause of the problem should be located.
Another guide to faster location of the causes of problems, the QUICK DIAGNOSIS CHART.
In this chart, numbers are used to indicate the components that may be the cause of 22 possible problems.
It is necessary to check only those components indicated by numbers during each step of the troubleshooting process to locate the cause of the problem quickly.

QUICK DIAGNOSIS CHART

The QUICK DIAGNOSIS CHART shows different problems and the relationship of components that might be the cause.

1. Components indicated in the "Adjustment" row indicate the possibility that the problem may result from an incorrect adjustment.
Check the adjustment of each component, and readjust if necessary.
2. Components indicated in the "Self-Diagnosis"row are diagnosed by the Powertrain control module (Transmission) self-diagnostic function.
3. Input and output signals of the Powertrain control module (Transmission) for components indicated in the "Tester" row can be easily checked with the Engine signal Monitor.
4. Components indicated in the "Mechanical System Test' row can be checked for malfunction by the results of oil pressure test.
5. Components indicated in the "Road Test" row can be checked for malfunction by the results of the road test.
6. The numbers in the chart indicate the order of inspection for detecting malfunctions.
7. Circled numbers indicate that the transmission must be removed from the vehicle.
8. The checking, adjusting, repair, and replacement procedures for components are described in the page(s) shown in the "Reference page" row.