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.
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HOMESERVICE MANUALSHYUNDAI2005ELANTRA GLS, 4D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSFUEL SYSTEMGASOLINE ENGINE CONTROL SYSTEMENGINE CONTROL MODULE (ECM)NOTES
2005 Hyundai Elantra GLS, 4D Hatchback, Automatic
Engine Control Module (ECM): Notes
2005 Hyundai Elantra GLS, 4D Hatchback, AutomaticSECTION Notes
- ECM HARNESS CONNECTOR
- ECM TERMINAL FUNCTION ECM CONNECTOR TERMINALS DESCRIPTION
Pin No. Description Connected to Remark 1 ECM ground Chassis ground 2 Power stage ground Chassis ground 3 Direct battery voltage supply Battery 4 Ignition coil output 1,4 Ignition Coil #1, 4 5 Ignition coil output 2,3 Ignition Coil #2, 3 6 CAN LOW Other control modules (TCM, ABS, etc.) 7 CAN HIGH Other control modules (TCM, ABS, etc.) 8 HO2S Heater (B1/S1) HO2S (B1/S1) 9 HO2S Heater (B1/S2) HO2S (B1/S2) 10 Knock Sensor Input Knock Sensor 11 CVVT Oil Control Valve output CVVT Oil Control Valve 12 Not connected - 13 Not connected - 14 Battery Voltage Supply after Main Relay Main Relay 15 Not connected - 16 Not connected - 17 Wheel Speed Sensor (-) Wheel Speed Sensor 18 Wheel Speed Sensor (+) Wheel Speed Sensor 19 Linear Lambda VG HO2S (B1/S1) 20 Not connected - 21 Battery Voltage Supply after Main Relay Main Relay 22 Battery Voltage Supply after Ignition Key Ignition Key 23 Injector output (cyl. 4) Injector (cyl. 4) 24 Injector output (cyl. 1) Injector (cyl. 1) 25 Spare Sensor supply Sensors 26 Purge Control Solenoid Valve (PCSV) PWM output Purge Control Solenoid Valve (PCSV) 27 Crankshaft Position Sensor ground Crankshaft Position Sensor 28 Not connected - 29 Crankshaft Position Sensor input Crankshaft Position Sensor 30 Camshaft Position Sensor ground Camshaft Position Sensor 31 Engine Coolant Temperature Sensor input Engine Coolant Temperature Sensor 32 Throttle Position Sensor input Throttle Position Sensor 33 Fuel Tank Pressure Sensor Input Fuel Tank Pressure Sensor 34 Fuel Tank Pressure Sensor Ground Fuel Tank Pressure Sensor 35 Not connected - 36 Not connected - 37 HO2S (B1/S2) ground HO2S (B1/S2) 38 Throttle Position Sensor ground Throttle Position Sensor 39 Vehicle Speed Sensor input Vehicle Speed Sensor Without ABS Wheel Speed Sensor input Wheel Speed Sensor With ABS 40 Linear Lambda VIP HO2S (B1/S1) 41 Linear Lambda VN HO2S (B1/S1) 42 HO2S (B1/S2) input HO2S (B1/S2) 43 Not Connected - 44 MAFS, IATS supply MAFS, IATS 45 Throttle Position Sensor supply Throttle Position Sensor 46 Spare Sensor supply 2 Sensors 47 Immobilizer Data Line Immobilizer 48 MAFS, IATS ground MAFS, IATS 49 Not connected - 50 Air Conditioner Compressor Switch input Triple Switch 51 Air Conditioner Pressure switch input Triple Switch 52 Oil Temperature Sensor input Oil Temperature Sensor 53 Linear Lambda VRC HO2S (B1/S1) 54 Knock Sensor ground Knock Sensor 55 Ignition shield ground Ignition Coil 56 Intake Air Temperature Sensor input MAFS, IATS 57 Not connected - 58 Air Conditioner Request Switch input Air Conditioner Request Switch 59 Sensor Ground Sensors 60 Mass Air Flow Sensor signal input MAFS 61 Injector output (cyl.3) Injector (cyl.3) 62 Injector output (cyl.2) Injector (cyl.2) 63 Not connected - 64 Cooling Fan Relay - High control output Cooling Fan Relay 65 Cooling Fan Relay - Low control output Cooling Fan Relay 66 Engine Speed signal output Tachometer 67 Main Relay control output Main Relay 68 Air Conditioner Compressor Relay control output Air Conditioner Compressor Relay 69 Electric Fuel Pump Relay control output Electric Fuel Pump Relay 70 Malfunction Indicating Lamp (MIL) output Malfunction Indicating Lamp (MIL) 71 Immobilizer ground Immobilizer With Immobilizer 72 Camshaft Position Sensor input Camshaft Position Sensor 73 Engine Coolant Temperature Sensor ground Engine Coolant Temperature Sensor 74 Throttle Position PWM output 75 Fuel Consumption signal output Trip Computer 76 Oil Temperature Sensor ground Oil Temperature Sensor 77 Diagnostic Data Line (k-Line) Data Link Connector (DLC) 78 Idle Speed Control Actuator PWM output 2 (CLOSE) Idle Speed Control Actuator 79 Canister Close Valve Output Canister Close Valve 80 Idle Speed Control Actuator PWM output 1 (OPEN) Idle Speed Control Actuator 81 Immobilizer Lamp output Immobilizer With Immobilizer - ECM TERMINAL INPUT/OUTPUT SIGNAL
RENDER: 1.0x
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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.