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Without the correct pinout:
Output to the instrument cluster's Malfunction Indicator Lamp. Helpful Resources
C Connector (22 pins) ┌─────────────────────────────────┐ │ 1 2 3 4 5 6 7 8 9 10 11│ │12 13 14 15 16 17 18 19 20 21 22│ └─────────────────────────────────┘
| Pin | Signal | Description | |------|--------|--------------| | C1 | #10 | Injector 1 & 3 common (12V from EFI relay) | | C2 | #20 | Injector 2 & 4 common (12V from EFI relay) | | C3 | EO1 | Power ground (injectors, igniter) | | C4 | EO2 | Power ground | | C5 | +B | 12V from EFI main relay (ECU power) | | C6 | +B1 | 12V from EFI relay (sensor power feed) | | C7 | M-REL | EFI main relay control (ECU grounds to activate) | | C8 | W | Check engine light | | C9 | TE1 | Diagnostic jumper (connects to TE2) | | C10 | TE2 | Diagnostic jumper | | C11 | VF | O₂ monitor / fuel trim output (to diag connector) | | C12 | E1 | ECU logic ground | | C13 | ISC1 | Idle speed control valve coil 1 | | C14 | ISC2 | ISC valve coil 2 | | C15 | ISC3 | ISC valve coil 3 | | C16 | ISC4 | ISC valve coil 4 | | C17 | HT | Heated oxygen sensor heater | | C18 | OX1 | O₂ sensor signal | | C19 | KNK | Knock sensor (if equipped) | | C20 | A/C | A/C switch signal | | C21 | FAN | Radiator fan relay control | | C22 | FC | Fuel pump relay control |
Without the correct pinout:
Output to the instrument cluster's Malfunction Indicator Lamp. Helpful Resources toyota 4afe ecu pinout
C Connector (22 pins) ┌─────────────────────────────────┐ │ 1 2 3 4 5 6 7 8 9 10 11│ │12 13 14 15 16 17 18 19 20 21 22│ └─────────────────────────────────┘ Without the correct pinout: Output to the instrument
| Pin | Signal | Description | |------|--------|--------------| | C1 | #10 | Injector 1 & 3 common (12V from EFI relay) | | C2 | #20 | Injector 2 & 4 common (12V from EFI relay) | | C3 | EO1 | Power ground (injectors, igniter) | | C4 | EO2 | Power ground | | C5 | +B | 12V from EFI main relay (ECU power) | | C6 | +B1 | 12V from EFI relay (sensor power feed) | | C7 | M-REL | EFI main relay control (ECU grounds to activate) | | C8 | W | Check engine light | | C9 | TE1 | Diagnostic jumper (connects to TE2) | | C10 | TE2 | Diagnostic jumper | | C11 | VF | O₂ monitor / fuel trim output (to diag connector) | | C12 | E1 | ECU logic ground | | C13 | ISC1 | Idle speed control valve coil 1 | | C14 | ISC2 | ISC valve coil 2 | | C15 | ISC3 | ISC valve coil 3 | | C16 | ISC4 | ISC valve coil 4 | | C17 | HT | Heated oxygen sensor heater | | C18 | OX1 | O₂ sensor signal | | C19 | KNK | Knock sensor (if equipped) | | C20 | A/C | A/C switch signal | | C21 | FAN | Radiator fan relay control | | C22 | FC | Fuel pump relay control | toyota 4afe ecu pinout
