Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2015 Kia Optima LimitedFACTORY OEM SERVICE PROCEDURE
ECM Terminal Function
Connector (CHTG-AG)
PIN DESCRIPTION CHART
| Pin No. | Description | Connected to |
|---|---|---|
| 1 | Ignition Coil (Cylinder #2) control output (Without Smart Key) | Ignition Coil (Cylinder #2) |
| Ignition Coil (Cylinder #3) control output (Smart Key) | Ignition Coil (Cylinder #3) | |
| 2 | - | |
| 3 | - | |
| 4 | - | |
| 5 | ETC Motor (+) control output | ETC Motor |
| 6 | ETC Motor (-) control output | ETC Motor |
| 7 | - | |
| 8 | - | |
| 9 | - | |
| 10 | - | |
| 11 | - | |
| 12 | Sensor power (+5V) | Electric Waste Gate Actuator (EWGA) |
| Rail Pressure Sensor (RPS) | ||
| A/C Pressure Transducer (APT) | ||
| Manifold Absolute Pressure Sensor (MAPS) #2 | ||
| Fuel Tank Pressure Sensor (FTPS) | ||
| 13 | - | |
| 14 | Heated Oxygen Sensor (HO2S) (Bank 1/Sensor 2) signal input | Heated Oxygen Sensor (HO2S) (Bank 1/Sensor 2) |
| 15 | - | |
| 16 | Electric Waste Gate Actuator (EWGA) Feed beck signal | Electric Waste Gate Actuator (EWGA) |
| 17 | CVVT Oil Temperature Sensor (OTS) signal input | CVVT Oil Temperature Sensor (OTS) |
| 18 | Manifold Absolute Pressure Sensor (MAPS)#2 signal input | Manifold Absolute Pressure Sensor (MAPS)#2 |
| 19 | - | |
| 20 | Fuel Tank Pressure Sensor (FTPS) signal input | Fuel Tank Pressure Sensor (FTPS) |
| 21 | Electric Waste Gate Actuator (EWGA) DC Motor output (-) | Electric Waste Gate Actuator (EWGA) |
| 22 | Ignition Coil (Cylinder #4) control output (Without Smart Key) | Ignition Coil (Cylinder #4) |
| Ignition Coil (Cylinder #1) control output (Smart Key) | Ignition Coil (Cylinder #1) | |
| 23 | - | |
| 24 | - | |
| 25 | - | |
| 26 | - | |
| 27 | - | |
| 28 | - | |
| 29 | - | |
| 30 | - | |
| 31 | - | |
| 32 | - | |
| 33 | Sensor power (+5V) | Throttle Position Sensor (TPS) 1, 2 |
| 34 | - | |
| 35 | Sensor ground | Heated Oxygen Sensor (HO2S) (Bank 1/Sensor 2) |
| 36 | - | |
| 37 | Sensor ground | Electric Waste Gate Actuator (EWGA) |
| 38 | - | |
| 39 | Rail Pressure Sensor (RPS) signal input | Rail Pressure Sensor (RPS) |
| 40 | - | |
| 41 | Sensor ground | Fuel Tank Pressure Sensor (FTPS) |
| 42 | Electric Waste Gate Actuator (EWGA) DC Motor output (+) | Electric Waste Gate Actuator (EWGA) |
| 43 | - | |
| 44 | - | |
| 45 | - | |
| 46 | - | |
| 47 | - | |
| 48 | - | |
| 49 | - | |
| 50 | - | |
| 51 | - | |
| 52 | - | |
| 53 | - | |
| 54 | Sensor ground | Throttle Position Sensor (TPS) 1, 2 |
| 55 | Sensor ground | Accelerator Position Sensor (APS) 2 |
| 56 | Sensor ground | Accelerator Position Sensor (APS) 1 |
| 57 | Immobilizer communication line | Smart Key Control Module (Smart Key) |
| Immobilizer Control Module (Immobilizer) | ||
| 58 | Sensor ground | CVVT Oil Temperature Sensor (OTS) |
| 59 | Intake Air Temperature Sensor (IATS) signal input | Intake Air Temperature Sensor (IATS) |
| 60 | Sensor ground | Rail Pressure Sensor (RPS) |
| 61 | Sensor ground | Manifold Absolute Pressure Sensor (MAPS) |
| Intake Air Temperature Sensor (IATS) | ||
| 62 | Sensor ground | Engine Coolant Temperature Sensor (ECTS) |
| 63 | Engine Coolant Temperature Sensor (ECTS) signal input | Engine Coolant Temperature Sensor (ECTS) |
| 64 | Ignition Coil (Cylinder #3) control output (Without Smart Key) | Ignition Coil (Cylinder #3) |
| Ignition Coil (Cylinder #2) control output (Smart Key) | Ignition Coil (Cylinder #2) | |
| 65 | - | |
| 66 | - | |
| 67 | - | |
| 68 | - | |
| 69 | - | |
| 70 | - | |
| 71 | - | |
| 72 | - | |
| 73 | - | |
| 74 | - | |
| 75 | Throttle Position Sensor (TPS) 2 signal input | Throttle Position Sensor (TPS) 2 |
| 76 | Accelerator Position Sensor (APS) 2 signal input | Accelerator Position Sensor (APS) 2 |
| 77 | Accelerator Position Sensor (APS) 1 signal input | Accelerator Position Sensor (APS) 1 |
| 78 | - | |
| 79 | - | |
| 80 | Sensor ground | A/C Pressure Transducer (APT) |
| 81 | Sensor ground | Manifold Absolute Pressure Sensor (MAPS) #2 |
| 82 | Manifold Absolute Pressure Sensor (MAPS) signal input | Manifold Absolute Pressure Sensor (MAPS) |
| 83 | Rc/Rp (Pump Cell Voltage) | Heated Oxygen Sensor (Bank 1/Sensor 1) |
| 84 | VS-/IP- (Common Ground for VS, IP) | Heated Oxygen Sensor (Bank 1/Sensor 1) |
| 85 | Ignition Coil (Cylinder #1) control output (Without Smart Key) | Ignition Coil (Cylinder #1) |
| Ignition Coil (Cylinder #4) control output (With Smart Key) | Ignition Coil (Cylinder #4) | |
| 86 | - | |
| 87 | - | |
| 88 | - | |
| 89 | - | |
| 90 | - | |
| 91 | - | |
| 92 | - | |
| 93 | - | |
| 94 | - | |
| 95 | - | |
| 96 | Throttle Position Sensor (TPS) 1 signal input | Throttle Position Sensor (TPS) 1 |
| 97 | Sensor power (+5V) | Accelerator Position Sensor (APS) 2 |
| 98 | Sensor power (+5V) | Accelerator Position Sensor (APS) 1 |
| 99 | - | |
| 100 | - | |
| 101 | A/C Pressure Transducer (APT) signal input | A/C Pressure Transducer (APT) |
| 102 | - | |
| 103 | Sensor power (+5V) | Manifold Absolute Pressure Sensor (MAPS) |
| 104 | Rc (Compensative Resistance) | Heated Oxygen Sensor (Bank 1/Sensor 1) |
| 105 | VS+ (NERNST Cell Voltage) | Heated Oxygen Sensor (Bank 1/Sensor 1) |
Connector (CHTG-BG)
PIN DESCRIPTION CHART
| Pin No. | Description | Connected to |
|---|---|---|
| 1 | ECM ground | Chassis ground |
| 2 | ECM ground | Chassis ground |
| 3 | Battery power (B+) | Main Relay |
| 4 | ECM ground | Chassis ground |
| 5 | Battery power (B+) | Main Relay |
| 6 | Battery power (B+) | Main Relay |
| 7 | - | |
| 8 | Crankshaft Position Sensor (CKPS) signal input | Crankshaft Position Sensor (CKPS) |
| 9 | - | |
| 10 | Brake Switch 2 signal input | Brake Switch |
| 11 | - | |
| 12 | - | |
| 13 | - | |
| 14 | Electrical load (wiper) signal input | Wiper Relay |
| 15 | Electrical load signal input (FR) | Alternator |
| 16 | Alternator PWM signal output (COM) | Alternator |
| 17 | - | |
| 18 | Cooling Fan Relay (High) control output | Cooling Fan Relay (High) |
| 19 | Immobilizer Lamp control output | Immobilizer Lamp (Without Button Engine Start System) |
| 20 | - | |
| 21 | - | |
| 22 | Injector (Cylinder #2) (High) control output | Injector (Cylinder #2) |
| 23 | Injector (Cylinder #2) (Low) control output | Injector (Cylinder #2) |
| 24 | - | |
| 25 | Sensor ground | Crankshaft Position Sensor (CKPS) |
| 26 | - | |
| 27 | Brake Switch 1 signal input | Brake Switch |
| 28 | - | |
| 29 | Camshaft Position Sensor (CMPS) (Bank 1/Intake) signal input | Camshaft Position Sensor (CMPS) (Bank 1/Intake) |
| 30 | Camshaft Position Sensor (CMPS) (Bank 1/Exhaust) signal input | Camshaft Position Sensor (CMPS) (Bank 1/Exhaust) |
| 31 | - | |
| 32 | LIN communication signal input | Battery Sensor |
| 33 | Cooling Fan Relay (Low) control output | Cooling Fan Relay (Low) |
| 34 | - | |
| 35 | - | |
| 36 | - | |
| 37 | - | |
| 38 | - | |
| 39 | Injector (Cylinder #3) (High) control output | Injector (Cylinder #3) |
| 40 | Injector (Cylinder #3) (Low) control output | Injector (Cylinder #3) |
| 41 | Battery power (B+) | Ignition Switch |
| 42 | - | |
| 43 | - | |
| 44 | Sensor shield | Knock Sensor (KS) |
| 45 | Sensor ground | Knock Sensor (KS) |
| 46 | Sensor ground | Camshaft Position Sensor (CMPS) (Bank 1/Intake) |
| 47 | Sensor ground | Camshaft Position Sensor (CMPS) (Bank 1/Exhaust) |
| 48 | - | |
| 49 | - | |
| 50 | - | |
| 51 | - | |
| 52 | - | |
| 53 | Main Relay control output | Main Relay |
| 54 | - | |
| 55 | - | |
| 56 | Injector (Cylinder #4) (High) control output | Injector (Cylinder #4) |
| 57 | Injector (Cylinder #4) (Low) control output | Injector (Cylinder #4) |
| 58 | Battery power (B+) | Battery |
| 59 | - | |
| 60 | CAN (Low) | Other control module, Data Link Connector (DLC), Multi-Purpose Check Connector |
| 61 | - | |
| 62 | Knock Sensor (KS) signal input | Knock Sensor (KS) |
| 63 | Clutch Switch signal input | Clutch Switch (M/T) |
| 64 | - | |
| 65 | - | |
| 66 | - | |
| 67 | - | |
| 68 | - | |
| 69 | Starter Relay control output | Starter Relay (With Smart Key) |
| 70 | Fuel Pump Relay control output | Fuel Pump Relay |
| 71 | Engine speed signal output | Smart Key Control Module |
| 72 | RCV Control Solenoid Valve control output | RCV Control Solenoid Valve |
| 73 | Injector (Cylinder #1) (High) control output | Injector (Cylinder #1) |
| 74 | Injector (Cylinder #1) (Low) control output | Injector (Cylinder #1) |
| 75 | Battery power (B+) | Battery |
| 76 | - | |
| 77 | CAN (High) | Other control module, Data Link Connector (DLC), Multi-Purpose Check Connector |
| 78 | Vehicle speed signal input | ESC Control Unit (With ESC) |
| 79 | - | |
| 80 | - | |
| 81 | - | |
| 82 | Starter Control Switch signal input | Smart Key Control Module (With Smart Key) |
| 83 | Fuel Level Sender (FLS) signal input | Fuel Level Sender (FLS) |
| 84 | CVVT Oil Control Valve (OCV) (Bank 1/Exhaust) control output | CVVT Oil Control Valve (OCV) (Bank 1/Exhaust) |
| 85 | CVVT Oil Control Valve (OCV) (Bank 1/Intake) control output | CVVT Oil Control Valve (OCV) (Bank 1/Intake) |
| 86 | Purge Control Solenoid Valve (PCSV) control output | Purge Control Solenoid Valve (PCSV) |
| 87 | Canister Close Valve (CCV) control output | Canister Close Valve (CCV) |
| 88 | Heated Oxygen Sensor (HO2S) (Bank 1/Sensor 1) Heater control output | Heated Oxygen Sensor (HO2S) (Bank 1/Sensor 1) |
| 89 | Heated Oxygen Sensor (HO2S) (Bank 1/Sensor 2) Heater control output | Heated Oxygen Sensor (HO2S) (Bank 1/Sensor 2) |
| 90 | Fuel Pressure Regulator Valve (High) control output | Fuel Pressure Regulator Valve |
| 91 | Fuel Pressure Regulator Valve (Low) control output | Fuel Pressure Regulator Valve |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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