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.
2021 Hyundai Veloster N Standard TransFACTORY OEM SERVICE PROCEDURE
ECM Terminal Input/Output signal
connector [A]
CONNECTOR DESCRIPTION (A)
| Pin No | Description | Condition | Type | Level |
|---|---|---|---|---|
| 1 | - | |||
| 2 | - | |||
| 3 | - | |||
| 4 | - | |||
| 5 | Electric Waste Gate Actuator (EWGA) DC Motor output (-) | |||
| 6 | Electric Waste Gate Actuator (EWGA) DC Motor output (+) | |||
| 7 | - | |||
| 8 | - | |||
| 9 | - | |||
| 10 | - | |||
| 11 | - | |||
| 12 | - | |||
| 13 | - | |||
| 14 | - | |||
| 15 | Electric Waste Gate Actuator (EWGA) Feed beck signal | |||
| 16 | CVVT Oil Temperature Sensor (OTS) signal input | |||
| 17 | Engine Coolant Temperature Sensor (ECTS) signal input | Idle | Analog | 0.5-4.5V (Idle: 1.02V) |
| 18 | Manifold Absolute Pressure Sensor (MAPS)#2 signal input | High: Battery voltage (B+) | ||
| 19 | Alternator "COM" PWM control output | Idle | Pulse | Low: Max. 1.5V Frequency: 125 Hz Vpeak = 360 - 440V |
| 20 | Ignition Coil (Cylinder #2) control output | Engine running | Pulse | 125<Frequency<1, 000 Hz (Idle: 333 Hz) Vpeak = 360 - 440V |
| 21 | Ignition Coil (Cylinder #3) control output | Engine running | Pulse | 125<Frequency<1, 000 Hz (Idle: 333 Hz) |
| 22 | - | |||
| 23 | - | |||
| 24 | - | |||
| 25 | - | |||
| 26 | - | |||
| 27 | - | |||
| 28 | - | |||
| 29 | - | |||
| 30 | - | |||
| 31 | - | |||
| 32 | - | |||
| 33 | - | |||
| 34 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 35 | - | |||
| 36 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 37 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 38 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 39 | Rail Pressure Sensor (RPS) signal input | Idle | Analog | -0.3 - 5.2V |
| 40 | - | Vpeak = 360 - 440V | ||
| 41 | Ignition Coil (Cylinder #4) control output | Engine running | Pulse | 125<Frequency<1, 000 Hz (Idle: 333 Hz) Vpeak = 360 - 440V |
| 42 | Ignition Coil (Cylinder #1) control output | Engine running | Pulse | 125<Frequency<1, 000 Hz (Idle: 333 Hz) |
| 43 | VCM Motor [+] control output | |||
| 44 | VCM Motor [-] control output | |||
| 45 | - | |||
| 46 | - | |||
| 47 | - | |||
| 48 | - | |||
| 49 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 50 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 51 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 52 | - | |||
| 53 | - | |||
| 54 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 55 | - | |||
| 56 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 57 | - | |||
| 58 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 59 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 60 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 61 | Sensor Shield | Idle | DC | -0.3 - 0.5V |
| 62 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 63 | Knock Sensor (KS) signal input | Knocking | Variable Frequency | -0.3 - 0.3V |
| Normal | 0V | |||
| 64 | - | |||
| 65 | E-CVVT Motor [-] control output | |||
| 66 | E-CVVT Motor [+] control output | |||
| 67 | E-CVVT Relay power | |||
| 68 | - | |||
| 69 | - | |||
| 70 | - | |||
| 71 | - | |||
| 72 | - | |||
| 73 | - | |||
| 74 | Camshaft Position Sensor (CMPS) [Bank 1/Exhaust] signal input | Engine running | Pulse | High: 4.5 - 5.5V |
| Low: -0.3 - 0.5V | ||||
| Frequency: 7 Hz (Idle), 25 Hz (3, 000 rpm) | ||||
| 75 | Aternator "FR" signal input | |||
| 76 | - | |||
| 77 | Feedback signal input | |||
| 78 | - | |||
| 79 | - | |||
| 80 | Throttle Position Sensor (TPS) 2 signal input | C.T | Analog | 4.2 - 5.0V |
| W.O.T | 3.3 - 3.8V | |||
| 81 | Intake Temperature Sensor (IATS) signal input | Idle | Analog | 0 - 5.0V (Idle: 2.55V) |
| 82 | Manifold Absolute Pressure Sensor (MAPS) #1 signal input | Idle | Analog | 0.8 - 1.6V |
| (Idle: 1.37V) | ||||
| 83 | Rc/Rp (Pumping Cell Voltage) | Idle | Analog | Normal: 450 ± 50 mV |
| Rich: Max. Normal +150 mV | ||||
| Lean: Min Normal - 150 mV | ||||
| 84 | VS-/IP- (Common Ground for VS, IP) | Idle | Analog | Reference for V_IP, V_N |
| 85 | - | |||
| 86 | E-CVVT Motor [-] control output | |||
| 87 | E-CVVT Motor [+] control output | |||
| 88 | E-CVVT Relay power | |||
| 89 | ETC Motor [+] control output | Engine running | Pulse | High: Battery voltage (B+) |
| Low: Max.1.0V | ||||
| 90 | ETC Motor [-] control output | Engine running | Pulse | High: Battery voltage (B+) |
| Low: Max.1.0V | ||||
| 91 | - | |||
| 92 | - | |||
| 93 | - | |||
| 94 | - | |||
| 95 | Crankshaft Position Sensor (CKPS) signal input | Engine running | Pulse | High: 4.5 - 5.5V |
| Low: -0.3 - 0.5V | ||||
| Frequency: 850 Hz (Idle), 3, 000 Hz (3, 000 rpm) | ||||
| 96 | Camshaft Position Sensor (CMPS) [Bank 1/Intake] signal input | Engine running | Pulse | High: 4.5 - 5.5V |
| Low: -0.3 - 0.5V | ||||
| Frequency: 7 Hz (Idle), 25 Hz (3, 000 rpm) | ||||
| 97 | - | |||
| 98 | - | |||
| 99 | Sensor power (+5V) | IG OFF | DC | Max. 0.5V |
| IG ON | 4.75 - 5.25V | |||
| 100 | Throttle Position Sensor (TPS) 1 signal input | C.T | Analog | 0.3 - 0.9V |
| W.O.T | 1.5 - 3.0V | |||
| 101 | Sensor power (+5V) | IG OFF | DC | Max. 0.5V |
| IG ON | 4.75 - 5.25V | |||
| 102 | Sensor power (+5V) | IG OFF | DC | Max. 0.5V |
| IG ON | 4.75 - 5.25V | |||
| 103 | Sensor power (+5V) | IG OFF | DC | Max. 0.5V |
| IG ON | 4.75 - 5.25V | |||
| 104 | Rc (Compensative Resistance) | Idle | Analog | | Rc-Rc/Rp | <± 0.1V |
| 105 | VS+ (NERNST Cell Voltage) | Idle | Analog | Normal: 450 ± 50 mV |
| Rich: Max. Normal +150 mV | ||||
| Lean: Min Normal -150 mV |
Connector [B]
CONNECTOR DESCRIPTION (B)
| Pin No | Description | Condition | Type | Level |
|---|---|---|---|---|
| 1 | ECM ground | Idle | DC | -0.3 - 0.5V |
| 2 | ECM ground | Idle | DC | -0.3 - 0.5V |
| 3 | Battery power (B+) | IG OFF | DC | Max. 1.0V |
| IG ON | Battery voltage (B+) | |||
| 4 | ECM ground | Idle | DC | -0.3 - 0.5V |
| 5 | Battery power (B+) | IG OFF | DC | Max. 1.0V |
| IG ON | Battery voltage (B+) | |||
| 6 | Battery power (B+) | IG OFF IG ON |
DC | Max. 1.0V Battery voltage (B+) |
| 7 | - | |||
| 8 | Flex Ray communication [High] signal input | |||
| 9 | - | |||
| 10 | Brake switch [Test] signal input | Brake OFF Brake ON |
DC | Battery voltage (B+) Max. 0.5V |
| 11 | - | |||
| 12 | - | |||
| 13 | Electric load signal input | Lamp OFF Lamp ON |
DC | Battery voltage (B+) -0.3 - 0.5V |
| 14 | Immobilizer communication line | |||
| 15 | - | |||
| 16 | Main relay control output | Relay OFF Relay ON |
DC | Battery voltage (B+) -0.3 - 1.2V |
| 17 | - | High: Battery voltage (B+) | ||
| 18 | Purge Control Solenoid Valve (PCSV) control output | Inactive Active | Pulse | Low: Max. 1.0V Vpeak: 42.0-60.0V Frequency: 20 Hz |
| 19 | E-CVVT Relay control output | |||
| 20 | - | |||
| 21 | - | |||
| 22 | Injector (Cylinder #2) [High] control output | Engine running | PWM | |
| 23 | Injector (Cylinder #2) [Low] control output | Engine running | Pulse | |
| 24 | - | |||
| 25 | Flex Ray communication [Low] signal input | |||
| 26 | - | |||
| 27 | Brake switch [Lamp] signal input | Brake OFF Brake ON |
DC | Max. 0.5V Battery voltage (B+) |
| 28 | - | |||
| 29 | - | |||
| 30 | A/C Pressure Transducer (APT) signal input | |||
| 31 | - | |||
| 32 | LIN communication signal input | |||
| 33 | Fuel pump relay control output | Relay OFF Relay ON |
DC | Battery voltage (B+) -0.3 - 1.2V |
| 34 | Start control output | Relay OFF Relay ON |
DC | Battery voltage (B+) -0.3 - 1.2V |
| 35 | Cooling fan relay [High] control output | Relay OFF Relay ON |
DC | Battery voltage (B+) Max. 1.0V |
| 36 | - | |||
| 37 | - | |||
| 38 | - | |||
| 39 | Injector (Cylinder #3) [High] control output | Engine running | PWM | |
| 40 | Injector (Cylinder #3) [Low] control output | Engine running | Pulse | |
| 41 | Battery power (B+) | IG OFF IG ON |
DC | Max. 1.0V Battery voltage (B+) |
| 42 | - | |||
| 43 | - | |||
| 44 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 45 | - | |||
| 46 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 47 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 48 | - | |||
| 49 | - | |||
| 50 | Sensor ground | Idle | DC | -0.3 - 0.5V |
| 51 | - | |||
| 52 | - | |||
| 53 | - | High: Battery voltage (B+) | ||
| 54 | Engine speed signal output | Engine running | Frequency | Low: -0.3 - 1.0V Frequency: 21 Hz (Idle), 100 Hz (3, 000 rpm) |
| 55 | - | |||
| 56 | Injector (Cylinder #4) [High] control output | Engine running | PWM | |
| 57 | Injector (Cylinder #4) [Low] control output | Engine running | Pulse | |
| 58 | Heated Oxygen Sensor [Bank 1/Sensor 2] signal input | Idle | DC | Max: 0.6 - 1.0V Min: Max. 0.4V |
| 59 | - | |||
| 60 | CAN [Low] | Recessive Dominant | Pulse | 2.0 - 3.0V 2.75 - 4.5V |
| 61 | starter signal input | S/W OFF S/W ON |
DC | -0.3 - 0.5V Battery voltage (B+) |
| 62 | - | |||
| 63 | - | |||
| 64 | Accelerator Position Sensor (APS) 2 signal input | C.T W.O.T | Analog | Max. 1.0V 1.5 - 3.0V |
| 65 | Accelerator Position Sensor (APS) 1 signal input | C.T W.O.T | Analog | Max. 1.0V Min 4.0V |
| 66 | - | |||
| 67 | - | |||
| 68 | - | |||
| 69 | - | |||
| 70 | - | |||
| 71 | Cooling fan relay [Low] control output | Relay OFF Relay ON |
DC | Battery voltage (B+) -0.3 - 1.2V |
| 72 | Variable Intake Solenoid Valve (VIS) control output | Active Inactive | DC | Max. 1.0V Battery voltage (B+) |
| 73 | Injector (Cylinder #1) [High] control output | Engine running | PWM | |
| 74 | Injector (Cylinder #1) [Low] control output | Engine running | Pulse | |
| 75 | Battery power (B+) | IG OFF IG ON |
DC | Max. 1.0V Battery voltage (B+) |
| 76 | - | |||
| 77 | CAN [High] | Recessive Dominant |
Pulse | 2.0 - 3.0V 2.75 - 4.5V |
| 78 | Vehicle signal input | |||
| 79 | Sensor power (+5V) | IG OFF IG ON |
DC | Max. 0.5V 4.75 - 5.25V |
| 80 | - | |||
| 81 | Sensor power (+5V) | IG OFF IG ON |
DC | Max. 0.5V 4.75 - 5.25V |
| 82 | Sensor power (+5V) | IG OFF IG ON |
DC | Max. 0.5V 4.75 - 5.25V |
| 83 | - | |||
| 84 | Fuel Level Sender | |||
| 85 | - | |||
| 86 | CVVT Oil Control Valve (OCV) [Bank 1/Intake] control output | Idle | Pulse | High: Battery voltage (B+) Low: -0.3 - 1.0V Frequency: 300 Hz |
| 87 | - | |||
| 88 | Heated Oxygen Sensor (HO2S) [Bank 1/Sensor 1] Heater control output | Engine running | Pulse | High: Battery voltage (B+) Low: -0.3 - 1.0V Frequency: 8 - 10Hz |
| 89 | Heated Oxygen Sensor (HO2S) [Bank 1/Sensor 2] Heater control output | Engine running | Pulse | Duty: 0 - 100% High: Battery voltage (B+) Low: -0.3 - 1.0V Frequency: 8 - 10 Hz Duty: 0 - 100% |
| 90 | Fuel Pressure Control Valve [High] control output | Engine running | PWM | |
| 91 | Fuel Pressure Control Valve [Low] control output | Engine running | Pulse |
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.