TPS - Harsh, Erratic, Or Delayed Transmission Shifts

NO: 18-13-94 Rev. A

GROUP: Vehicle Performance

DATE: Sep. 9, 1994

SUBJECT:
Harsh, Erratic or Delayed Transmission Shifts

THIS BULLETIN SUPERSEDES SERVICE BULLETIN 18-13-94 DATED AUG. 5, 1994 WHICH SHOULD BE REMOVED FROM YOUR FILES. ENGINE RESTRICTIONS HAVE BEEN ADDED AND THE DIAGNOSTIC PROCEDURE HAS BEEN REVISED. ALL CHANGES ARE HIGHLIGHTED WITH **ASTERISKS**.

MODELS:

1994 (AS) Caravan/Voyager/Town & Country
1994 (ES) Chrysler Voyager (Export Only)
1994 (LH) Concorde/Intrepid/Vision/LHS/New Yorker

NOTE:
THIS BULLETIN APPLIES TO VEHICLES **EQUIPPED WITH THE 3.3L, 3.5L AND 3.8L ENGINE** BUILT BEFORE JULY 1, 1994 (MDH 07-01-XX).

SYMPTOM/CONDITION:

Delayed, harsh or erratic transmission upshifts. Torque converter lock/unlock bumps, unexpected or harsh downshifts. Condition is more apparent when engine is cold (after a 6 hr. or more cold soak) and during warm-up.

DIAGNOSIS:

Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRBII or III) with the appropriate diagnostic procedure manual, verify that all engine/transmission systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order for future reference and repair as necessary.

With the DRBII or III, MDS (in dynamic data display **or engine state display**), or the Data Recorder installed, operate the throttle lever and read the throttle position sensor voltage. With the throttle fully closed, the voltage should be 1.2 or less. **Slowly move the throttle through its full range of travel, full open then full closed, and watch the voltage readings. The voltage change should be smooth and should reach 3.7 volts or higher at wide open throttle. If any sticking, erratic voltage change or no voltage change during throttle movement in encountered, particularly when moving the throttle from wide open to closed throttle, proceed with the following repair.**

PARTS REQUIRED:

1 4759001 Throttle Position Sensor

REPAIR PROCEDURE:

This bulletin involves replacing the throttle position sensor with a revised part.

1. Following the proper procedure, remove and replace the throttle position sensor using the new sensor, P/N 4759001.

POLICY:
Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:
Labor Operation No: 08-14-10-95 0.2 Hrs.

FAILURE CODE: P8 - New Part