Engine Controls - Driveline Bump on Acceleration: Overview

Group: TRANSAXLE

Number: 05-40-002

Date: APRIL, 2005

Model:
2004 ELANTRA

Subject

PCM REPROGRAMMING INSTRUCTIONS FOR MILD DRIVELINE BUMP BETWEEN 2-10 MPH

DESCRIPTION:

Some 2004 MY Elantra vehicles with automatic transmissions may experience a mild driveline "bump" when accelerating from a stop after the vehicle has been parked for more than approximately one hour.

The driveline bump may be felt as one, two or three successive bumps between 2-10 mph in 1st gear only, and occurs only once for each driving cycle.

This bulletin provides a procedure to reprogram the Powertrain Control Module (combined ECM and TCM) using the Hi-Scan Pro.

VEHICLES AFFECTED:
^ Model: 2004 ELANTRA vehicles with automatic transaxles and CVVT engines

^ Affected vehicle production date range:

-- Produced from November 13, 2003 to May 28, 2004





TCM REPROGRAMMING SPECIFICATIONS

CAUTIONS BEFORE REPROGRAMMING:

1. Conduct reprogramming with the ignition key in the "ON" position.

2. Be careful not to disconnect any cables connected to the vehicle or Hi-Scan Pro during reprogramming.

WARNING:
If reprogramming is interrupted, the manual update procedure must be used.

3. Do not start the engine during reprogramming.

4. Do not turn the ignition key OFF during reprogramming.

5. When the reprogramming is completed, turn the ignition key OFF for 20 seconds before starting the engine.





WARRANTY INFORMATION