1JZ-GTE, 2JZ-GTE (Non-VVTi & VVTi), 3S-GE, 5VZ-FE.
Finding a specific pinout for a Toyota ECU with the part number can be challenging because that number is actually the prefix for hundreds of different Toyota Engine Control Units (ECUs).
The primary chassis ground for the ECU casing and internal digital logic. toyota 89661 ecu pinout
Because the "89661" suffix changes depending on the specific engine, year, market, and transmission, there is no single universal pinout. This guide breaks down how to identify your specific ECU generation, understand universal Toyota pinout acronyms, and safely probe the unit. How to Identify Your Specific 89661 ECU
Finding a "good blog post" or guide for these ECUs often requires matching your specific part number. Here are the best resources for identifying your wiring: 1JZ-GTE, 2JZ-GTE (Non-VVTi & VVTi), 3S-GE, 5VZ-FE
Because Toyota altered plug styles frequently, relying on generic internet forum images can be risky. Follow this systematic approach to verify your exact layout: Step 1: Match the Complete Part Number
Ignition Trigger signal sent from the ECU to the igniter/coil to fire the spark plug. Because the "89661" suffix changes depending on the
Example Part Number: 89661-3A090 [ 89661 ] - [ 3A090 ] | | Product Code Specific Vehicle/Engine/Transmission Match
Ignition Confirmation signal sent back from the igniter to the ECU. If the ECU misses this signal, it cuts fuel for safety.
EFI Relay control output. The ECU switches this on to ground the EFI relay coil, powering up the system. E1: Main chassis ground.
Engine load signals. PIM stands for Pressure Intake Manifold (MAP sensor); VG stands for Voltage Generation (MAF sensor).