Toyota 89661 Ecu Pinout ((link)) -

Toyota uses consistent acronyms across most of its vehicle range, even across different engines. Understanding these is key to mapping any ECU. Description BATT / B+ Battery Positive Constant 12V+ power from the battery. IGSW / IGN Ignition Switch 12V+ signal only when the key is on. E01, E02, E03 Engine Grounds Main grounds for fuel injectors and power circuits. E1 Signal Ground Clean ground for sensors. M-REL Main Relay ECU controls this to send power back to the ignition. +B / +B2 Power Supply Switched power from the main relay. FC / FPR Fuel Pump Relay Triggers the fuel pump relay to activate. NE+ / NE- Crank Sensor Crankshaft Position Sensor signal input. G+ / G- Cam Sensor Camshaft Position Sensor signal input. IGT Ignition Trigger Tells igniters/coils when to fire. IGF Ignition Feedback Confirms to ECU that spark occurred. W / WHL Check Engine Light Connects to the CEL (ground-switched).

The Engine Control Unit (ECU) is the brain of your Toyota vehicle. Among the various ECU part numbers, the is one of the most widely used across classic and modern Toyota platforms, including the Camry, Corolla, Supra, Tacoma, and Hilux.

Most 89661 ECUs use (A, B, C) or four connectors (A, B, C, D). The pins are numbered embossed on the plug housing.

If you have the ECU but no diagram:

THW (Coolant), THA (Intake Air), MAP/MAF, TPS (Throttle Position).

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

Disclaimer: This article is for informational purposes only. Always consult the official service manual for your specific vehicle before performing any electrical diagnostics or repairs. toyota 89661 ecu pinout

| Suffix Example | Vehicle | Engine | |----------------|---------|--------| | 89661-0W590 | Toyota Camry 2007-2011 | 2AZ-FE (2.4L) | | 89661-33260 | Toyota Corolla 2005-2008 | 1ZZ-FE (1.8L) | | 89661-06A70 | Toyota Prius 2004-2009 | 1NZ-FXE (1.5L Hybrid) | | 89661-0P130 | Toyota RAV4 2006-2012 | 2AZ-FE | | 89661-30490 | Toyota Highlander 2008-2013 | 2GR-FE (3.5L V6) |

Output signal to the EFI relay to provide main power.

: Camshaft position sensor inputs (used for cylinder identification). Fuel and Air Management Toyota uses consistent acronyms across most of its

The 89661 series regulates critical functions like fuel injection, ignition timing, and sensor integration for vehicles produced between the early 1990s and late 2010s. : Common units include 89661-02682 (2000 1ZZ-FE) and 89661-0Z661 : Typically uses modules like 89661-06J10 (2010 2.5L) or 89661-06G41 (2008-09 2.4L). Trucks/Tacoma : Models such as the 1989 Truck use 89661-35150 , while newer Tacomas use units like 89661-04K61 Hilux/Surf 89661-3D100 is a common unit for older Hilux Surf models. Flagship One Inc Typical Wiring and Pins 1989 Toyota Truck 2.4L - ECM ECU PCM | 89661-35150

The number 89661 simply identifies the unit as an . The numbers after the dash (e.g., 89661- XXXXX ) denote the specific vehicle, engine, and region.