With Scan Tool
SELF-DIAGNOSIS FUNCTIONThe self-diagnostic system, which is integrated in the EC-AT control unit, diagnoses malfunction of the main sensors (input), solenoid valves (output), and the EC-AT control unit.
Malfunctions which have happened or are continuing are memorized in the EC-AT control unit as specific codes. The EC-AT Tester is used to retrieve these malfunction codes. Each malfunction is indicated by a code number and buzzer.
Assembly of EC-AT Tester
For E-AT Tester body (49 G019 901) and adapter unit (49 H019 902)
1. Connect the Adapter unit (49 H019 902) to the EC-AT Tester body (49 G019 901), and connect the 6-pin connector to the Adapter unit.
2. Connect the E~AT Selector (49 B029 9A1) to the assembled EC-AT Tester body (49 G019901) and Adapter unit (49 H019 902). [Turbo]
3. Set the Panel (49 G019 916 for Turbo; 49 G019 913 for Non-Turbo) onto the assembled EC-AT Tester.
4. Set the code switch on the Adapter unit to position A.
5. Set the vehicle switch on the Adapter unit to the 626 p0sition.
6 .Set the vehicle switch on the EC-AT Selector to position 2. [Turbo]
For EC-AT Tester body (49 G019 901A)
1. Connect the EC-AT Selector (49 BOl 9 9A1) to the EC-AT Tester body (49 G019 901A). [Turbo]
2. Set the Panel (49 G019 915 for Turbo; 49 G019 912 for Non-Turbo) onto the EC-AT Tester body.
3. Set the code switch on the EC-AT Tester body to position A.
4. Set the vehicle switch on the EC-AT Tester body to the 626 position.
5. Set the vehicle switch on the EC-AT Selector to position 2. [Turbo]
GENERAL NOTE
1. If there is more than one malfunction, the code numbers will be displayed in numerical order.
2. The HOLD indicator turbo) or MIL (Non-Turbo) flashes to indicate the same pattern as the buzzer of the EC-AT Tester when the test connector (blue, 1-pin for Turbo; green, 1-pin for Non-Turbo) is grounded. When the test connector is not grounded, the indicator flashes at a constant frequency unless the malfunction recovers. However, the malfunction code is memorized in the EC-AT control unit.
3. The EC-AT control unit has a built-in fail-safe function for the throttle sensor, the pulse generator, and the 1-2, 2-3, and 3-4 shift solenoid valves.
If a malfunction occurs, the EC-AT control unit will control operation of the remaining components according to a preset fail-safe program. The vehicle may still be driven, although the driving performance will be slightly affected.
4. The memory of malfunction codes is canceled when the negative battery terminal is disconnected for approximately five seconds.
RETRIEVAL PROCEDURES
TURBO
1. Locate the check connector (blue, 6-pin) and test connector (blue, 1-pin) under the dash, left of the steering column.
2. Connect the 6-pin connector of the EC-AT Tester to the check connector (blue, 6-pin).
3. Ground the ground connector of the EC-AT Tester.
4. Ground the test connector (blue, 1-pin).
5. Turn the ignition switch ON.
6. Check that "88" flashes on the digital display and the buzzer sounds for three seconds.
7. If "88" does not flash, check the test connector wiring.
8. If "88" flashes and the buzzer sounds continuously for more than 20 8ecOnds, check wiring to 1 C terminal of the ECAT control unit for a short-circuit. If necessary, replace the EC-AT control unit and repeat Steps 2 to 5.
9. Note any code numbers and check for the causes by refer- ring to the INSPECTION PROCEDURES. Repair as necessary.
Note After repairs are made, recheck for code number8 by performing the "AFTER-REPAIR PROCEDURES".
NON-TURBO
CAUTION Do not connect two connectors of the EC-AT TESTER (AND EC-AT SELECTOR) to EC-AT control unit at the same time.
1. Locate the check connector (green, 6-pin) and test connector (green, 6-pin) in the engine compartment at the rear of the left side wheel housing.
2. Connect the 6-pin connector of the EC-AT Tester to the check connector (green, 6-pin).
3. Ground the ground connector of the EC-AT Tester.
4. Ground the test connector (green, 6-pin).
5. Turn the ignition switch ON.
6. Check that "88" flashes on the digital display and the buzzer sounds for three seconds.
7. If "88" does not flash, check the test connector wiring.
8. If "88" flashes and the buzzer sounds continuously for more than 20 seconds, check wiring to i F terminal of the engine control unit for a short-circuit. If necessary, replace the engine control unit and repeat Steps 2 to 5.
9. Note any code numbers and check for the causes by referring to the INSPECTION PROCEDURES. Repair as necessary.
NOTE After repairs are made, recheck for code number by performing the "AFTER-REPAIR PROCEDURES".