A/T - Improper Shifting

88mazda04

Category 7
Applicable Model/s

1987 626 EC-AT
Subject

EC-AT IMPROPER SHIFTING (EGI HARNESS)
Bulletin No. 046/88
Issued 6/6/88
Revised
DESCRIPTION

The following EC-AT shift complaint may be due to an erratic throttle sensor signal caused by moisture, corrosion or insufficient connection of the EGI or dash harness.

Traveling at a constant speed or at acceleraton, ^ Surging, jumps out of gear
^ Shift hunting (shifting continuously between 2nd and 3rd or between 3rd and O/D)
^ Erratic converter lock-up etc.

These conditions are felt especially at approximately 30 mph cruising speed. If you encounter such a complaint, perform the repair procedure listed in this bulletin, NOTE:
This is supplemental information to the previous bulletin Cat. 7 No. 045/88, dated May 2, 1988.



REPAIR PROCEDURES

1. Check if the EGI harness is properly grounded at the B32 connector. If the terminal is rusted or the bolt is loose, repair it and apply a suitable anti-rust agent. Then, go to step 2.

2. Connect an EC-AT tester as per the 1987 626 Workshop Manual. (See page 7B-6)

3. Turn the ignition switch "ON".



4. Check if the throttle sensor voltage is within the following specification and is stabilized (not fluctuating). Specification:
Throttle Closed: 0.4 - 0.6 Volts
Throttle Fully Opened: 4.0 Volts Approximately

If the reading is out of the specified range, adjust the throttle sensor seaing as per the workshop manual (page 4A-17). If the throttle sensor voltage fluctuates, go to step 6.

5. Start the engine. If any inspection code is shown on the EC-AT Tester, perform the necessary repair as per the workshop manual. Check the idle switch adjustment. Idle switch input indicator should be on at idle and should be off when the accelerator pedal is depressed. If not, check or adjust the idle switch as per the workshop manual. Check the throttle sensor voltage. If the throttle sensor voltage fluctuates, go to step 6.



6. Check the EGI and injection harness and their connector. Check if the LgB, GO, LgW, LgR wires are properly connected at B-35 connector. If the terminal is rusted or the harness is cut, clean up the terminal or repair the harness, then apply a suitable anti-rust agent.



Inspect the EGI harness for water or a poor connection under the foam protector area near the B-35 connector. Check the point where the throttle sensor wires LgB, LgW and GO segments are joined by a crimp connection. If it is rusted or moisture is found, solder these connectors and protect them with insulated tape. Make sure the harness is not touching the steering pipe. If the problem can not be solved after performing the above mentioned inspection, go to step 7.



7. Check the B-25 and the X-09 connectors to determine if the LgB, GO, LgW and LgR wires are properly connected.
NOTE: The connecting point of the wires may be different depending on the production period of the vehicle.
WARRANTY INFORMATION

Customer Comment Code: 99
Damage Code: 99
Part Number of Main Cause: FU16-19-090 (EC-AT Assy.)
Operation Number: XX0277RX
Labor Hours: 0.4 hr.
NOTE: Labor hours includes the following items:
^ Throttle sensor and idle switch inspection and adjustment
^ EGI harness and dash harness inspection and repair