EECIV System - Steady Speed Stumble

Bulletin No.: 004/94
Issued: 04/5/94
Revised:

Category
F

Applicable Model/s
1994 626/MX-6 with 4Cyl/ATX

Subject:
EECIV STEADY SPEED STUMBLE

APPLICABLE MODELS/VINS
1994 626/MX-6 with 4cylinder engine and ATX with a VIN of 1YVGE22(or 31) C*R5165333 or lower>

NOTE:
The asterisk (*) in the VIN can be any number (0 through 9) or "X".

DESCRIPTION
626/MX-6 models with an in-line 4cylinder engine and a CD4E automatic transaxle may experience a high speed stumble at steady speeds of 40 - 65 MPH. The stumble is felt as a momentary loss of power or a miss. The occurrence of the stumble is approximately once per hour but can vary greatly. Noise on the Vbatt circuit (a reference voltage used by the EECIV control module) is interpreted by the EECIV as a valid signal from the distributor. An error occurs in the module and synchronization is momentarily lost causing a stumble. A countermeasure EECIV module with a noise filter is available to correct this problem.

REPAIR PROCEDURE
1. Verify the complaint occurs intermittently and only at a steady speed. if the stumble occurs other than as described, refer to the workshop manual for troubleshooting procedures.
2. Check the service codes stored in the control unit. If no service codes are found, proceed to the next step. If service codes are present, refer to the workshop manual for troubleshooting procedures.
3. Verify that the EECIV module present in the vehicle has a production code of "F" or earlier.
4. Replace the EECIV module with a countermeasure part.





PARTS INFORMATION

WARRANTY INFORMATION
(Applies to vehicles covered under normal vehicle warranty)

Warranty Type: A
Symptom Code: 08
Damage Code: 9W
Part Number Main Cause: FS62 18 881G
Quantity: 1
Operation Number: YY0L40RX
Labor Hours: 0.5 Hrs.