LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Hyundai >> 2006 >> Elantra Limited >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel System (G4GC-GSL 2.0) >> Engine Control Module (ECM) >> 3. ECM Terminal Input/Output Signal
April 5, 2026: LEMON Manuals is launched! Read the announcement.

3. ECM Terminal Input/Output Signal

ECM TERMINAL INPUT/OUTPUT SIGNAL CHART

Pin No. Description Input, Output Value Vehicle State Test Result
Type Range
1 ECM ground Static Signal 0 ~ 0.5V Always 0.3V
2 Power stage ground Static Signal 0 ~ 0.5V Always 0.3V
3 Direct battery voltage supply Static Signal Vbatt Others 12.5 V (Vbatt Level)
Running 13.7 V (Vbatt Level)
4 Ignition coil output 1, 4 Pulse
G04923749Courtesy of HYUNDAI MOTOR CO.
 Engine run High: 14.03V
Low: 0.78~1.13V
Peak voltage: 348V
Idle: 17.2Hz
5 Ignition coil output 2, 3 Pulse
G04923749Courtesy of HYUNDAI MOTOR CO.
 Engine run High: 14.03V
Low: 0.78~1.13V
Peak voltage: 348V
Idle: 17.2Hz
6 CAN LOW DC 2.0 ~ 3.0V Recessive  
PWM 0.5 ~ 2.25V Dominant
G04923751Courtesy of HYUNDAI MOTOR CO.
7 CAN HIGH DC 2.0 ~ 3.0V Recessive  
PWM 2.75~4.5V Dominant
G04923751Courtesy of HYUNDAI MOTOR CO.
8 HO2S Heater (B1/S1) PWM
G04923753Courtesy of HYUNDAI MOTOR CO.
 Engine run High: 14.01V
Low: 0.4V
Frequency: 10Hz
9 HO2S Heater (B1/S2) PWM
G04923753Courtesy of HYUNDAI MOTOR CO.
 Engine run High: 14.01V
Low: 0.4V
Frequency: 10Hz
10 Knock Sensor Input Frequency -0.5 ~ 0.7V 0V Knocking normal 0.3V 0V
11 CVVT Oil Control Valve output PWM
G04923753Courtesy of HYUNDAI MOTOR CO.
 Engine run High: 14.01V
Low: 0.4V
Frequency: 300Hz
12 Not connected        
13 Not connected        
14 Battery Voltage Supply after Main Relay DC Vbatt IG ON 12.7V
0 ~ 0.5V IG OFF 0.3V
15 Not connected        
16 Not connected        
17 Wheel Speed Sensor (-) Sensor signal Approximately
50rpm: 37Hz, 236mV pk-pk
100rpm: 76Hz, 376mV pk-pk
1000rpm: 769Hz, 1.64V pk-pk		 Vehicle run
G04923756Courtesy of HYUNDAI MOTOR CO.
18 Wheel Speed Sensor (+) Sensor signal Approximately 50rpm: 37Hz, 236mV pk-pk
100rpm: 76Hz, 376mV pk-pk
1000rpm: 769Hz, 1.64V pk-pk		 Vehicle run
G04923757Courtesy of HYUNDAI MOTOR CO.
19 Linear lambda VG Complex Signal      
20 Not connected        
21 Battery Voltage Supply after Main Relay Static Signal Vbatt IG ON 12.7V
0 ~ 0.5V IG OFF 0.3V
22 Battery Voltage Supply after Ignition Key Static Signal Vbatt IG ON 12.7V
0 ~ 0.5V IG OFF 0.3V
23 Injector output (cyl. 4) Frequency
G04923758Courtesy of HYUNDAI MOTOR CO.
 Idle: 6.25Hz
3000rpm: 12.6Hz		 High: 14.01V
Low: 0.3V
Peak voltage: 58V
24 Injector output (cyl. 1) Frequency
G04923758Courtesy of HYUNDAI MOTOR CO.
 Idle: 6.25Hz
3000rpm: 12.6Hz		 High: 14.01V
Low: 0.3V
Peak voltage: 58V
25 Spare Sensor supply Static Signal Vcc IG ON 5V
0 ~ 0.5V IG OFF 0.3V
26 Purge Control Solenoid Valve (PCSV) PWM output PWM
Pulse
G04923760Courtesy of HYUNDAI MOTOR CO.
 Inactive Active (after warm up & racing) High: 14.01V
Low: 0.3V
Frequency: 20Hz
27 Crankshaft Position Sensor ground Static Signal 0 ~ 0.5V Always 0.2 V
28 Not connected        
29 Crankshaft Position Sensor input Frequency
G04923761Courtesy of HYUNDAI MOTOR CO.
 Idle: 740Hz 5V
3000rpm: 3126Hz 0.3V
30 Camshaft Position Sensor ground Static Signal   Always  
31 Engine Coolant Temperature Sensor input Analog -40°C ~ 293°C
4.9V ~ 0.322V		 176°C 1.25V
32 Throttle Position Sensor input Analog 0.25 ~ 0.8V Idle 0.3V
4.15 ~ 4.7V W.O.T 4.16V
33 Fuel Tank Pressure Sensor input Analog   Engine run 2.3V
34 Fuel Tank Pressure Sensor ground Static Signal 0 ~ 0.5V Always 0.3V
35 Not connected        
36 Not connected        
37 HO2S (B1/S2) ground Static Signal 0 ~ 0.5V Always 0.3V
38 Throttle Position Sensor ground Static Signal 0 ~ 0.5V Always 0.3V
39 Vehicle Speed Sensor input Pulse
G04923761Courtesy of HYUNDAI MOTOR CO.
 Vehicle run High: 5V
Low: 0.9V
40 Linear lambda VIP Complex Signal      
41 Linear lambda VN Complex Signal      
42 HO2S (B1/S2) input Analog Pulse
G04923763Courtesy of HYUNDAI MOTOR CO.
 3000rpm
After warm up		 0.8V
0.1V
Frequency: 1.1 Hz
43 Not Connected        
44 MAFS, IATS supply Static Signal 5V IG ON 5.1V
0 ~ 0.5V IG OFF 0.3V
45 Throttle Position Sensor supply Static Signal 5V IG ON 4.9V
0 ~ 0.5V IG OFF 0.4V
46 Spare Sensor supply 2 Static Signal 5V IG ON 5V
0 ~ 0.5V IG OFF 0.3V
47 Immobilizer Data Line Pulse
G04923753Courtesy of HYUNDAI MOTOR CO.
 IG ON High: 14V
Low: 0.5V
48 MAFS, IATS ground Static Signal 0 ~ 0.5V Always 0.4V
49 Not connected        
50 Air Conditioner Compressor Switch input DC Vbatt SW ON 13V
0 ~ 0.5V SW OFF 0.3V
51 Air Conditioner Pressure switch input DC Vbatt SW ON 12.9V
0 ~ 0.5V SW OFF 0.4V
52 Oil Temperature Sensor input Analog -40°C ~ 266°C
4.9V ~ 0.4V		 183.2°C 1.29V
53 Linear Lambda VRC Complex Signal      
54 Knock Sensor ground Static Signal 0 ~ 0.5V Always 0.3V
55 Ignition shield ground Static Signal 0 ~ 0.5V Always 0.3V
56 Intake Air Temperature Sensor input Analog -40°C - 266°C
4.9V ~ 0.34V		 Idle 2.3V
57 Not connected        
58 Air Conditioner Request Switch input DC Vbatt SW ON 12.9V
0 ~ 0.5V SW OFF 0.4V
59 Sensor ground Static Signal 0 ~ 0.5V Always 0.3V
60 Mass Air Flow Sensor signal input Analog   Idle 1.0V
3000 RPM 2.3V
61 Injector output (cyl.3) Frequency
G04923758Courtesy of HYUNDAI MOTOR CO.
 Idle: 6.25Hz
3000rpm: 12.6Hz		 High: 14.01V
Low: 0.3V
Peak voltage: 58V
62 Injector output (cyl.2) Frequency
G04923758Courtesy of HYUNDAI MOTOR CO.
 Idle: 6.25Hz
3000rpm: 12.6Hz		 High: 14.01V
Low: 0.3V
Peak voltage: 58V
63 Not connected        
64 Cooling Fan Relay - High control output DC Vbatt SW OFF 12.9V
  SW ON 0.4 V
65 Cooling Fan Relay - Low control output DC Vbatt SW OFF 13V
  SW ON 0.5V
66 Engine Speed signal output Frequency
G04923767Courtesy of HYUNDAI MOTOR CO.
 Engine run High: 10.5V
Low: 0.4V
Idle: 24.7Hz
3000 RPM: 104.6HZ
67 Main Relay control output DC 0 ~ 1V IG ON 0.9V
Vbatt IG OFF 13.5V
68 Air Conditioner Compressor Relay control output DC 0 ~ 0.5V A/C ON 0.2V
Vbatt A/C OFF 12.5V
69 Fuel Pump Relay control output DC Vbatt IG ON 13.08V
0 ~ 0.5V Idle 0.3V
70 Malfunction Indicator Lamp (MIL) output DC 0 ~ 0.5V IG ON 0.4V
Vbatt Vbatt 13.6V
71 Immobilizer ground Static Signal 0 ~ 0.5V Always 0.4V
72 Camshaft Position Sensor input Frequency
G04923768Courtesy of HYUNDAI MOTOR CO.
 Idle: 6.3 Hz
3000 RPM: 25 Hz		 High: 5V
Low: 0.6V
73 Engine Coolant Temperature Sensor ground Static Signal 0 ~ 0.5V Always 0.4V
74 Throttle Position PWM output PWM
G04923767Courtesy of HYUNDAI MOTOR CO.
 Engine run High: 12.75V
Low: 0.5V
Frequency: 100Hz
C.T: 5% duty
W.O.T: 90% duty
75 Fuel Consumption signal output PWM
G04923767Courtesy of HYUNDAI MOTOR CO.
 Engine run High: 12.75V
Low: 0.5V
Frequency: 100Hz
76 Oil Temperature Sensor ground Static Signal 0 ~ 0.5V Always 0.4V
77 Diagnosis line (k-line) Pulse
G04923753Courtesy of HYUNDAI MOTOR CO.
 IG ON High: 14V
Low: 0.5V
78 Idle Speed Control Actuator PWM output2 PWM
G04923767Courtesy of HYUNDAI MOTOR CO.
 Idle High: 15V
Low: 0.3V
Frequency: 250Hz
79 Canister Close Valve output PWM
Pulse
G04923760Courtesy of HYUNDAI MOTOR CO.
 Engine run High: 14.01V
Low: 0.3V
Peak voltage: 58V
Frequency: 10Hz
80 Idle Speed Control Actuator PWM output1 PWM
G04923767Courtesy of HYUNDAI MOTOR CO.
 Idle High: 15V
Low: 0.3V
Frequency: 250Hz
81 Malfunction Indicator Lamp output DC 0 ~ 0.5V IG ON 0.4V
Vbatt Cranking 13.6V
scientia non olet · About LEMON Manuals