Engine Control Computer - Modification

91lexus01

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.