ECM - Driveability, Water Contamination In ECM Connector
Group Ref.: Chassis/Body ElectricalBulletin No.: 338109A
Date: December, 1993
SUBJECT:
CORROSION IN ECM CONNECTOR
(RESEAL ENGINE HARNESS PASS-THROUGH TO FRONT OF DASH)
MODELS:
1992-94 BUICK SKYLARK
1992-94 OLDSMOBILE ACHIEVA
1992-94 PONTIAC GRAND AM
This bulletin replaces previous bulletin. Previous bulletin addressed temporary fix. This bulletin provides a permanent fix. The 1994 model year is also now included.
Condition:
Some owners may experience various driveability symptoms.
Cause:
Some vehicles may have engine harness pass-through leaking between the gasket and front of dash, or between wires in the engine harness pass-through. Some engine harness pass-through bodies to front of dash may allow moisture to penetrate between the wires or around the connector gasket. Moisture may contaminate or corrode the ECM connectors.
Correction:
Reseal the engine harness pass-through using the following procedure:
1. Open hood.
2. Remove screws securing the engine harness pass-through to front of dash - right hand corner near right fender.
3. Gently pull harness upward enough to allow access to harness pass-through sealing surfaces, being careful not to pinch or stress harness wires.
4. Apply a thin coat of urethane sealer, P/N 12345633, or equivalent, to the sealing surface of engine harness pass-through. Be sure gasket is in place before reassembly.
5. Reinstall harness pass-through and install screws. Torque to 2 N-m (17 lbs.in.).
6. Remove enough electrical tape from engine harness end of pass-through to expose pass through plastic base and all wires to the point of where the glue stops.
7. Use urethane sealer, P/N 12345633, or equivalent, and seal wire bundle to pass-through plastic base as shown in Figure 1. Also seal between any wires not sealed by the clear hot melt glue.
8. Re-tape harness up to and surrounding the plastic shell of harness pass-through with electrical tape.
9. Close hood.
Parts are currently available from GMSPO.
WARRANTY INFORMATION:
For vehicles repaired under warranty, use:
Labor Operation: T3378
Labor Time: .4 Hr.