| Pin | Signal | Description | |------|----------------|----------------------------------| | C1 | ISC solenoid | Idle speed control (if separate from IAC) | | C2 | CLT gauge output | Coolant temp gauge to dash | | C3 | Tachometer output | RPM signal for cluster | | C4 | K-line (ISO 9141) | Diagnostics (OBD) – K line | | C5 | L-line | Diagnostics (rarely used) | | C6 | Serial data (OBD2) | J1850 or CAN (late models) | | C7 | Torque converter clutch (auto) | TCC solenoid control | | C8 | Trans shift solenoid A | Auto transmission | | C9 | Trans shift solenoid B | Auto transmission |
Pin — Signal 1 — Ground (chassis) 2 — Fuel pump relay control (FP) 3 — Injector 1 (INJ1) 4 — Injector 2 (INJ2) 5 — Injector 3 (INJ3) 6 — Injector 4 (INJ4) 7 — Ignition coil primary / IG1 8 — Ignition coil primary / IG2 9 — Knock sensor (KNK) 10 — Crankshaft position sensor (CKP) 11 — Camshaft position sensor (CMP) 12 — Mass air flow / intake air temp (MAF/IAT) or MAP input (model dependent) 13 — Throttle position sensor (TPS) signal 14 — Intake air temperature (IAT) — if not combined 15 — Coolant temperature sensor (ECT) 16 — Idle air control / stepper motor (IAC) 17 — Air conditioning request input (A/C) 18 — Neutral or clutch switch input (neutral/clutch) 19 — Brake switch / cruise cancel input 20 — Speedometer / vehicle speed sensor (VSS) input 21 — O2 sensor (lambda) signal (heated) — bank 1 22 — Secondary O2 or wideband (if equipped) 23 — Main relay power (IG power) 24 — Battery constant +12V (B+) 25 — Ignition switch power (IG2) 26 — CAN high / serial comm (or data link) 27 — CAN low / serial comm (or ground for some models) 28 — EEPROM backup / memory power 29 — Diagnostic (K-line / ECU diagnostic) 30 — EGR control / solenoid (if equipped) 31 — Turbo boost control / wastegate solenoid (turbo models) 32 — Not used / spare or chassis ground suzuki k6a engine ecu pinout