Toyota — 89661 Ecu Pinout !full!

: Constant +12V power from the battery (keeps ECU memory/fault codes alive). IGSW : Ignition switch signal that tells the ECU to wake up.

❌ – They are not. A 89661-02020 (MR2 Turbo) has a completely different pinout than a 89661-2F210 (Camry). ❌ Using a pinout for a different transmission type – Auto and manual ECUs swap several pins (neutral switch, PNP signals). ❌ Mixing up connector numbering – Some diagrams number left-to-right, others right-to-left. Look for a molded “1” on the connector.

Often uses 31-pin, 24-pin, and 17-pin layouts housed in white plastic plugs. toyota 89661 ecu pinout

The Toyota 89661 part number prefix denotes an Engine Control Unit (ECU) used across decades of Toyota vehicles. Whether you are swapping a 1JZ/2JZ engine, wiring an old-school 4A-GE, or diagnosing a modern 2GR-FE V6, understanding the 89661 pinout is critical for a successful project.

If the CEL doesn't illuminate when the key is in the "ON" position, the ECU is likely not receiving power (+B) or the internal capacitors have leaked. 6. Resources for Specific Diagrams : Constant +12V power from the battery (keeps

Splicing sensor grounds ( E2 ) into chassis grounds ( E1 ) introduces electrical noise from the alternator and starter motor into the sensor lines. This causes erratic idle behaviors, inaccurate coolant temperature readings, and false oxygen sensor codes. Keep sensor grounds completely isolated on their dedicated pins. Pro-Tips for Wiring and Custom Swaps

Constant 12V battery power directly from the fuse box (used to maintain ECU memory/trims). A 89661-02020 (MR2 Turbo) has a completely different

While there isn't a single "official" review for a generic (as "89661" is a prefix used for hundreds of different Engine Control Units), technical feedback from automotive forums and technician platforms like JustAnswer consistently highlights its utility for DIY repairs and engine swaps. Overview of the Toyota 89661 Series