Where is the ECU on a Lexus LS400?
The actually engine code is 1UZ-FE not 1UZ-GE. The U.S. Spec Lexus LS400 and SC400 ECU is located on the driver side under the glove compartment. Once you open up the panels, you can not miss it. The LS400 using T8-a diagram and SC400 uses T7-a. The below connector diagrams are view as if you are looking at it directly.
How does an adaptronic work on a Lexus LS400?
Specifically the ignition and air flow directions. The early LS400 wiring harness contains 4 plugs that connect to the OEM ECU. According to the 1992 LS400 Electrical Wiring Diagram, these are referred to plugs A, B, C, and D. Only some of these wires are actually needed to connect to the four plugs for the Adaptronic.
Where is the IDL pin on a Lexus LS400?
On Plug C, the IDL pin can optionally be used as one of the eight Dig in’s. Also the G- and NE- are connected together in the harness, only one needs to connect to the Adaptronic, remove the other completely or wire G- and NE- together. Also note the IGT’s.
What does the Super AFC do in a Lexus?
The Super AFC is designed to fine tune and “squeeze” power out of existing engine setups by allowing the user to modify the fuel curve with precision accuracy. The AFC, while not completely universal, comes preprogrammed with most of the commonly used air flow meter/ pressure sensor maps.
Specifically the ignition and air flow directions. The early LS400 wiring harness contains 4 plugs that connect to the OEM ECU. According to the 1992 LS400 Electrical Wiring Diagram, these are referred to plugs A, B, C, and D. Only some of these wires are actually needed to connect to the four plugs for the Adaptronic.
Where are the plugs on a Lexus LS400?
The early LS400 wiring harness contains 4 plugs that connect to the OEM ECU. According to the 1992 LS400 Electrical Wiring Diagram, these are referred to plugs A, B, C, and D. Only some of these wires are actually needed to connect to the four plugs for the Adaptronic.
On Plug C, the IDL pin can optionally be used as one of the eight Dig in’s. Also the G- and NE- are connected together in the harness, only one needs to connect to the Adaptronic, remove the other completely or wire G- and NE- together. Also note the IGT’s.
Can You piggyback with an OEM ECU?
If you choose to piggyback with the OEM ECU because of your application, you will want to tap some of the connections instead of swapping the pins. This is noted in the Standalone/Piggyback columns. Please keep in mind this is only a recommendation. Take the time to review the wiring diagrams for your specific application.