3s-fe Ecu Pinout Pdf

John had searched online for hours, but all he could find were fragmented diagrams and incomplete pinout charts. He had even checked the usual suspects, such as repair manuals and factory service bulletins, but to no avail. The more he searched, the more frustrated he became.

The primary chassis ground for the ECU housing and digital logic.

(specifically for the 1995–1997 RAV4/Camry era) which you can save as a PDF using your browser's "Print to PDF" feature. 3S-FE ECU Pinout Guide (26-16-12 Pin Configuration) The 3S-FE engine, found in the Toyota RAV4 , typically uses three main connectors labeled A, B, and C. Connector A (26-Pin) Description Injector No. 1 & No. 3 Control Injector No. 2 & No. 4 Control Ignition Trigger Signal Ignition Confirmation Signal Crankshaft Position Sensor (+) Crankshaft Position Sensor (-) 5V Power Supply for Sensors Throttle Position Sensor Signal Engine Ground (Chassis) Connector B (16-Pin) Description Constant Battery Power (+12V) Switched Ignition Power (+12V) Fuel Pump Relay Control Check Engine Light (Warning) Vehicle Speed Sensor Signal Connector C (12-Pin) Description Intake Air Temperature Sensor Engine Coolant Temperature Sensor Oxygen Sensor Signal Knock Sensor Signal Helpful Resources for PDF Downloads

Often used for diagnostic connections (TE1, TE2) and load signals like vehicle lighting or heated windows. Key Terminal Assignments 3s-fe ecu pinout pdf

+5V constant reference voltage supplied by the ECU to power sensors like the MAP sensor and Throttle Position Sensor (TPS).

Used in sequential injection setups on late-generation 3S-FE engines. Fuel Pump Control

Main chassis ground loop for the ECU housing and logic circuitry. Sensor Ground John had searched online for hours, but all

Input from the Air Temp Sensor (located in airbox or intake pipe). Oxygen Sensor Signal input from the primary narrow-band O2cap O sub 2 Ignition & Fuel Outputs Description IGT Ignition Trigger Output signal sent to the igniter to fire the coil. IGF Ignition Feedback

Use automotive-grade wire labels or heat-shrink label tubes on your harness to identify +B , IGSW , FC , and grounds for seamless maintenance down the line.

[Battery +12V] ----------> BATT (Constant Power) [Ignition Key ON] -------> IGSW (Signal) [EFI Relay Output] ------> +B / +B1 (System Power) [Chassis/Engine Block] --> E1 / E01 / E02 (Grounds) The primary chassis ground for the ECU housing

When working with these pinouts, it is recommended to use a multimeter to verify continuity and voltage at each pin. Common issues in 3S-FE harnesses include corroded terminals loose pins

The Toyota 3S-FE, a staple of the Celica, Camry, and RAV4 lineages, utilizes a Bosch-style L-Jetronic or TCCS (Toyota Computer Control System) depending on the production year. Early models often feature a 10P-18P-14P configuration, while later OBD-I and early OBD-II variants shifted toward the 26P-16P-22P block connectors. Standard ECU Pinout Configuration (Common 26P/16P/22P Type) Connector A (26-Pin): Power and Grounds Description Battery +12V Constant power for ECU memory +B Switched +12V Main power from EFI relay W Check Engine Light Ground trigger for dash warning E1 Engine Ground Main ECU ground to intake manifold E01 Power Ground High-current ground for injectors Connector B (16-Pin): Sensors and Inputs Description VC 5V Reference Power supply for MAP/TPS sensors PIM MAP Sensor Intake manifold pressure signal THW Coolant Temp Resistance-based temperature signal THA Intake Air Temp Air density calculation signal VTA TPS Signal Throttle position voltage Connector C (22-Pin): Actuators and Ignition Description #10 Injector 1 & 3 Pulse ground for fuel delivery #20 Injector 2 & 4 Pulse ground for fuel delivery IGT Ignition Trigger Timing signal sent to the igniter IGF Ignition Confirm Feedback signal from igniter to ECU ISC1 Idle Speed Stepper motor control for idle Critical Troubleshooting Pathways

Found in late-model RAV4s and Ipsums. These often switched to a distributorless, wasted-spark ignition system (coil packs) and integrated OBD-II diagnostics. Standard 3S-FE ECU Pin Functions