ECM - Engine Die Out at Low Speeds

91chrysler07

NO.: 18-11-91

GROUP: DRIVEABILITY

DATE: Aug. 26, 1991


SUBJECT: Start-Stall and/or Decel Dieout During Parking Lot (Low Speed) Maneuvers - 3.0L & 3.3L Engines


MODELS:

1989-90 (AC) DYNASTY/NEW YORKER LANDAU/SALON
(AQ) CHRYSLER'S TC
(AS) CARAVAN/GRAND CARAVAN/CARAVAN C/V
VOYAGER/GRAND VOYAGER/TOWN & COUNTRY
(AY) IMPERIAL/NEW YORKER FIFTH AVENUE

THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-31-90, DATED 12/17/90 WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH >> ARROWS <<.


SYMPTOM/CONDITION:

Vehicle may exhibit either or both of the following conditions:

Parking lot (low speed) maneuvering dieout: Throttle is opened briefly to move vehicle and engine dies out when throttle is closed.

Start up dieout: Engine will start but fail to run up to idle RPM, or it will initially run up to idle RPM but fail to continue idling. Engine will run normally if throttle is held open.

These conditions will occur only on vehicles with non-cycling AC compressor when the AC is left on for extended periods of time and only when the ambient temperature is above 40~ F (4~ C).


DIAGNOSIS:

Connect a DRB II tester to the vehicle diagnostic connector.

1. With the engine at normal operating temperature and with the AC on, record the AIS position while idling in DRIVE. Then, with the left foot on the brake and parking brake engaged, open throttle slightly (less than 1/4 throttle) and again record the AIS position. Is the AIS position with the throttle open less than the AIS position at idle in DRIVE?

2. With the engine at normal operating temperature and the AC off, idle in DRIVE for five minutes to allow AIS to update itself. Again, with left foot on the brake and the parking brake engaged, open throttle slightly and record the AIS position. Is the AIS position with the throttle open less than the AIS position at idle in DRIVE?


3. If the answer to Step 1 is "Yes" and the answer to Step 2 is "No", proceed with the following repair procedure.


PARTS REQUIRED:

1 Single Module Engine Controller (SMEC)

1989 3.0L Engine
AS Body, Federal 4639386
AS Body, California 4639001
AC Body, Federal 4639382
AC Body, California 4639384

1990 3.0L Engine

>> AS Body, Federal (except Town & Country) 4639422 <<
>> AS Body, California (except Town & Country) 4639424 <<
AC & AY Bodies, Federal 4639398
AC & AY Bodies, California 4639400
AQ Body, Federal 4650386
AQ Body, California 4650388

>> AS Body, Federal (except Town & Country) 4639386 <<
>> AS Body, California (except Town & Country) 4639001 <<


1990 3.3L Engine
AS Body, Federal 4672435
AS Body, California 4672438
AC & AY Bodies, Federal 4672440
AC & AY Bodies, California 4672431

1 Authorized Modification Label 4275086


REPAIR PROCEDURE:

This repair involves the replacement of the engine controller with a revised one.

1. Replace the engine controller (SMEC/SBEC) with the appropriate unit called out in PARTS REQUIRED.

Figure 1:

2. Type the required information on the Authorized Modification Label, as illustrated in Figure 1, and attached near the VECI label.


* INSERT PART NUMBER USED.

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE
Labor Operation No. 08-19-90-93 . . . . . . . . . . . . . . . . . 0.5 Hrs.

FAILURE CODE: AM - Authorized Modification