lexus Workshop Repair Guides

Lexus Workshop Service and Repair Manuals

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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.

Customer Interest for Engine Control Module: > < Exhaust Pipe - Outlet and Gasket|Page 1225