LS 400 V8-4.0L (1UZ-FE) (1990)
Engine Control Module: All Technical Service Bulletins
Engine Control Computer - Modification
ENGINE
004
FEBRUARY 8, 1991
LS400
Title ENGINE CONTROL COMPUTER MODIFICATION
The Engine Control Computer has been modified to improve the following:
1.
Slight engine pinging on light acceleration between 1100 and 1200 RPM (for 1990 and 1991 model years).
2.
Fast idle speed intermiftently out of specification just after starting the engine (for 1990 model year only).
PRODUCTION CHANGE EFFECTIVE:
STARTING VIN
PRODUCTION DATE
JT8UF11E - M0054200
October 1990
PART NUMBER INFORMATION:
MODEL
PREVIOUS P/N
NEW P/N
PART NAME
APPLICATION
YEAR
1990
89661-50030
89661-50032
Computer, Engine Control
Cal Spec without
1991
89661-50031
TRACtion Control
1990
89661-50040
89661-50042
"
California Spec
1991
89661-50041
with TRAC
1990
89661-50010
89661-50032
"
Federal Spec
1991
89661-50031
without TRAC
1990
89661-50020
"
89661-50042
Federal Spec
1991
89661-50041
with TRAC
INTERCHANGEABILITY:
New ECU's are the same for both Federal and California Emission vehicles.
New ECU's are applicable to both 1990 and 1991 models.