A/T - Poor Shift Quality

88mazda08

Category 7
Applicable Model/s 1988 626/MX-6 EC-AT
Subject IMPROVEMENT OF SHIFT QUALITY
Bulletin No. 049/88
Issued 9/8/88
Revised
DESCRIPTION

If a customer complains of poor shift quality, such as shift delay, engine flare-up, slipping or chatter during shift up and down, perform the repair procedure listed in this bulletin.


REPAIR PROCEDURE

1. Basic Inspection

^ Check the whole wire harness, connectors and sensors with an EC-AT tester and a circuit tester according to the 1988 626/MX-6 Workshop Manual.

^ Check the ATF condition. If it is burnt or discolored, overhaul the transmission, then go to step 2. If not, go to step 2.

3.ATF Level AdjustmentWarm up the engine for about 5 - 10 minutes (ATF temperature rises at 150~F) and then measure the ATF level. With the ATF at 150~F, the ATF level should be at "F" level mark with the engine running in "P" range.:

2. 2-4 Brake Band Adjustment

Remove the oil pan and gasket located on the underside of the transmission.

Loosen the lock nut and tighten the piston stem exactly at the specified torque.

Tightening Torque:
10 N-m (1.1 m-kg, 96 in.lbs.)

Loosen the piston stem exactly 2 turns.

Tighten the locknut.



4. Throttle Cable (Line Pressure) Adjustment

Turn off the engine.

Remove the splash shield next to the left front tire.

Remove the square head plug "L" and install the oil pressure gauge set.

Shift into "P" range and start the engine.

Adjust the idle speed to:
Non-Turbo: 750-800 rpm
Turbo: 725 - 775 rpm



Adjust locknuts:
When the locknuts are moved, line pressure is increased or decreased as shown. Adjust the cable locknuts to correct position using the following procedure.

Step 1

Initially install the locknuts fully away from the throttle cam. (Loosen the cable all the way.)

Step 2

Adjust the locknuts in a clockwise direction as viewed from the front of the vehicle until the line pressure begins to increase above the specification shown.
Step 3

Adjust the locknuts in a counterclockwise direction until the line pressure decreases to the specification exactly. Tighten the locknuts.

Specified Pressure: 450 kPa (4.6 kg/sq.cm, 66 psi)

NOTE:
Transmission in "P" range.

Turn off the engine.

Apply "Teflon" tape to threads and reinstall the square head plug.
WARRANTY INFORMATION

Customer Comment Code: 99
Damage Code: 99
Part Number of Main Cause: FU17 19 880
Operation No: XX0268RX

Labor Hour: 1.5 Hr. (including the 2-4 brake band adjustment, the ATF level check, and the throttle cable adjustment)