4s-fe Ecu Pinout Jun 2026
When tracing the pinout for a 4S-FE, you will typically find these standard Toyota terminal codes: : Switched battery power (12V) through the EFI main relay. : Constant battery power (12V) for memory backup. E1 / E01 / E02 : Main computer grounds. : Sensor ground (return path for sensors like THW and THA). : Fuel injector signals. : Ignition timing signal to the igniter. : Ignition feedback signal from the igniter. : Crankshaft/Engine speed signal. : Engine coolant temperature sensor signal. : Intake air temperature sensor signal. : Manifold absolute pressure (MAP) sensor power and signal. : Oxygen sensor signal. : Starter signal (indicates the engine is cranking). : Vehicle speed sensor signal. Pinout Resources and Guides Interactive Forums : Community members on Toyota Nation
Because the 4S-FE was produced across several generations, the wiring can vary between the early "flat plug" OBD1 style and the later "vertical" connector styles. This guide focuses on the common 26-pin, 16-pin, and 22-pin configurations found in early-to-mid 90s models. Understanding the Connector Layout 4s-fe ecu pinout
| Pin | Code | Function | | :--- | :--- | :--- | | | W | Check Engine Light (MIL) | | C8 | TE1 | Diagnostic Jumper (for blinking codes) | | C9 | TE2 | Diagnostic Test Mode | | C10 | E1 | Diagnostic Ground | When tracing the pinout for a 4S-FE, you
Do you have the from the ECU sticker? I can try to find the specific variant for that unit. 4E-FE ECU Pinout and Wiring Diagram | PDF - Scribd : Sensor ground (return path for sensors like THW and THA)
| Pin | Wire Color | Function | Signal Type | Voltage/Note | | :--- | :--- | :--- | :--- | :--- | | C1 | White | Distributor NE+ (Crank angle) | AC sine wave | 0.5V – 5V depending on RPM | | C2 | Red | Distributor NE- (Sensor ground) | 0V | Shielded wire ground | | C3 | Blue | Distributor G1 (Cam position) | AC sine wave | TDC Cylinder #1 | | C4 | Yellow | Distributor G2 (Cam position) | AC sine wave | TDC Cylinder #4 | | C5 | (Empty) | N/A | N/A | N/A | | C6 | Violet | Air Conditioning (A/C) Request | +12V (AC ON) | Tells ECU to raise idle | | C7 | Light Green | Power Steering Oil Pressure Switch | Ground (when turning) | Idle-up signal | | C8 | Black | Diagnostic Port (TE1) | Ground via diag box | Jumper TE1 to E1 for codes | | C9 | White-Black | Diagnostic Port (E1) | Chassis ground | Common diagnostic ground | | C10 | Black-Red | VSV (EGR or Purge) | Ground switched | Emission control | | C11 | Red | Electric Fan Relay | Ground switched | Turns on radiator fan | | C12 | Pink-Blue | Speed Sensor (SPD) | 5V square wave | From combination meter | | C13 | (Empty) | N/A | N/A | N/A | | C14 | Red-Blue | +12V Main (IG SW) | +12V (Key ON) | Wakes up the ECU |