XJR (X300) L6-4.0L SC (AJ16) (1995)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
Engine Performance - Various Driveability Complaints
05.1-09
DATE:
2/95
Sedan Range
MODEL:
1995 MY
Sedan (4.0L) Range
VIN
As listed below
EMS - Cold Idle Instability, Abrupt Low Speed Throttle Transition Warm, Hesitation/Instability at 50/60 MPH (80-100 KM/H) - Repair Procedure
ISSUE:
1995 MY vehicles in the model and VIN ranges listed below may display the following symptoms.
SYMPTOMS
Idle hesitation or instability following cold start.
Hesitation or instability at cruising speeds of 50 - 60 mph (80-100 km/h).
Throttle abruptness ("lurching" or hesitation) at low speed, low throttle application with a warm engine.
MODEL
VIN RANGE
Sedan (4.0L NA) Range 1995 MY
VIN 720001 - 724499
XJR Sedan
VIN 720001 - 740020
These symptoms result from an unfavorable combination of fuel volatility and ignition timing factors. The ECM EPROM has been revised to correct
these conditions from VIN 724500 Sedan (4.0L NA) Range, VIN 740021 XJR Sedan and VIN 197550 XJS (4.0L) Range.
ACTION:
If customers complain of the symptoms listed above on vehicles within the quoted VIN range and all other engine parameters are within specification,
the ECM will require upgrading. To upgrade an ECM to the latest specifications, follow the procedure outlined below.
ECM UPGRADE PROCEDURE
1.
Complete the Dealer Supplied Information section on a photocopy of the attached Engine Management EPROM Upgrade form.
2.
Call the Jaguar Technical Hotline (1-800-910-8324).
3.
The Jaguar Technical Service Representative will verbally request the Dealer Supplied Information from the form and assign a Case Number
which must be written on the form.
NOTE:
A copy of the completed Engine Management EPROM Upgrade form must be retained in the vehicle service file.