Remove the ECU cover (usually two screws or clips).
: For many older Toyota ECUs (like the
Focus on the (1GR, 2UZ, 1ZZ) instead of just the ECU number. toyota 89661 ecu pinout
While layouts vary, most 89661 ECUs share these standard terminal abbreviations: : Battery power (main power source). E1, E2, E3 : Ground pins for the ECU and various sensors. Remove the ECU cover (usually two screws or clips)
| Pin | Signal | Notes | |-----|----------------|-------| | C1 | CANH (CAN High) | OBD-II diagnostics | | C2 | CANL (CAN Low) | | | C3 | SIL (Serial data link) | Toyota proprietary | | C4 | TXCT (Transmit to diagnostic tool) | | | C5 | RXCT (Receive from diagnostic tool) | | | C6 | W (Warning light – MIL) | | | C7 | TACH (Tachometer output) | To cluster or diagnostic connector | | C8 | VSS (Vehicle speed output) | 4-pulse per revolution | | C9 | PSCT (Power steering signal) | Idle-up input | | C10 | STP (Stop lamp switch) | Brake pedal input | | C11 | IMI (Immobilizer signal) | From transponder key amplifier | | C12 | CODE (Immobilizer code line) | | | C13 | K-LINE (ISO 9141-2) | Older diagnostic | | C14 | L-LINE | | | C15 | IG+ (Ignition switch +12V) | Main ECU power | | C16 | E (Sensor ground return) | | E1, E2, E3 : Ground pins for the ECU and various sensors