Hyundai Elantra (CN7): Engine Control System / Engine Control Module (ECM)

Hyundai Elantra (CN7) 2021-2025 Service Manual / Engine Control / Fuel System / Engine Control System / Engine Control Module (ECM)

Schematic diagrams

ECM Terminal And Input/Output signal

ECM Terminal Function
Connector [A]
Pin No
Description
1
Fuel Pressure Control Valve (FPCV) [High] control
2
Integrated Thermal Mangement Module (ITM) Motor (+)
3
Integrated Thermal Mangement Module (ITM) Motor (-)
4
-
5
Engine Coolant Temperature Sensor (ECTS) #1 (Ground)
6
-
7
Engine Coolant Temperature Sensor (ECTS) #2 (Ground)
8
-
9
Rail Pressure Sensor (RPS) (Ground)
10
-
11
Manifold Absolute Pressure Sensor (MAPS) (Ground)
12
Electric WGT Control Actuator (EWGA) (Ground)
13
-
14
Oil Pressure & Temperature Sensors (OPTS) (Ground)
15
-
16
-
17
A/C Pressure Transducer (APT) (Ground)
18
Sensor Power (+5V) (Camshaft Position Sensor (CMPS) [Bank 1 / Intake, Exhaust])
19
Sensor Power (+5V) (MAPS, CKPS)
20
Sensor Power (+5V) (OPS, ETC, RPS)
21
Sensor Ground (Throttle Position Sensor (TPS))
22
-
23
-
24
Sensor Shield (Knock Sensor (KS))
25
-
26
Ignition Coil (Cylider #3) Control
27
-
28
-
29
-
30
-
31
-
32
-
33
-
34
-
35
Integrated Thermal Mangement Module (ITM) Motor (Ground)
36
-
37
Camshaft Position Sensor (CMPS) [Bank 1 / Intake] Signal
38
-
39
Electric WGT Control Actuator (EWGA) Signal
40
Sensor Power (+5V) (EWGA)
41
Sensor Power (+5V) (APS #1)
42
Sensor Power (+5V) (APT)
43
Injector (Cylinder #3) [+] Control
44
Injector (Cylinder #2) [+] Control
45
-
46
-
47
CCP-CAN (High)
48
Ignition Coil (Cylider #1) Control
49
-
50
-
51
-
52
-
53
-
54
-
55
-
56
-
57
-
58
-
59
-
60
Camshaft Position Sensor (CMPS) [Bank 1 / Exhaust] (Ground)
61
-
62
-
63
Engine RPM Output
64
Injector (Cylinder #1) [+] Control
65
Injector (Cylinder #4) [+] Control
66
Injector (Cylinder #3) [-] Control
67
Injector (Cylinder #4) [-] Control
68
Ignition Coil (Cylider #2) Control
69
CCP-CAN (Low)
70
Camshaft Position Sensor (CMPS) [Bank 1 / Exhaust] Signal
71
Crankshaft Position Sensor (CKPS) (Ground)
72
Ignition Lock Switch Control
73
Oil Pressure Sensor (OPS) Signal
74
Intake Air Temperature Sensor (IATS) Signal
75
Engine Coolant Temperature Sensor (ECTS) #1 Signal
76
Engine Coolant Temperature Sensor (ECTS) #2 Signal
77
-
78
-
79
Throttle Position Sensor (TPS) 2 Signal
80
Rail Pressure Sensor (RPS) Signal
81
-
82
Integrated Thermal Mangement Module (ITM) Motor Signal
83
-
84
A/C Pressure Transducer (APT) Signal
85
-
86
Injector (Cylinder #2) [-] Control
87
Injector (Cylinder #1) [-] Control
88
Fuel Pressure Control Valve (FPCV) [Low] control
89
-
90
Ignition Coil (Cylider #4) Control
91
Crankshaft Position Sensor (CKPS) Signal
92
Integrated Body Control Unit (IBU) External Wake-Up Signal
93
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 2] (Ground)
94
-
95
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 1] Signal
96
-
97
Oil Temperature Sensor (OTS) Signal
98
Throttle Position Sensor (TPS) 1 Signal
99
-
100
-
101
Manifold Absolute Pressure Sensor (MAPS) Signal
102
Camshaft Position Sensor (CMPS) [Bank 1 / Intake] (Ground)
103
-
104
Knock Sensor (KS) Signal
105
Knock Sensor (KS) (Ground)

Connector [B]
Pin No
Description
1
Chassis Ground
2
Chassis Ground
3
Battery power (B+) (Battery)
4
Chassis Ground
5
Battery power (B+) (Main Relay)
6
Battery power (B+) (Main Relay)
7
-
8
-
9
Sensor Power (+5V) (ITM Motor)
10
Sensor Power (+5V) (APS #2)
11
Boost Pressure Sensor (BPS) Signal Input
12
Accelerator Position Sensor (APS #2) (Ground)
13
Accelerator Position Sensor (APS #1) (Ground)
14
-
15
-
16
Boost Pressure Sensor (BPS) (Ground)
17
Fuel Level Sender (FLS) Signal
18
Accelerator Position Sensor (APS #2) Signal
19
-
20
-
21
-
22
Rail Pressure Sensor (RPS) Control
23
Cooling Fan Relay [PMW] Control
24
EWGA DC Motor Control (+)
25
EWGA DC Motor Control (-)
26
Ignition Switch Signal Input
27
Sensor Power (+5V) (BPS)
28
-
29
-
30
Brake [Test] Switch Signal Input
31
Brake [Light] Switch Signal Input
32
Accelerator Position Sensor (APS #1) Signal
33
-
34
-
35
Engine Start Switch Signal Input
36
-
37
Fuel Pump Relay Control [Without Smart Key] Control
38
-
39
-
40
Variable Oil Pump Valve Control
41
ETC Motor [+] Control
42
ETC Motor [-] Control
43
-
44
-
45
P-CAN (Low)
46
-
47
-
48
Clutch Switch Control
49
Wiper Switch Input
50
-
51
Start Relay (Low) Control
52
-
53
-
54
Electric load Signal Input [Defrost]
55
-
56
-
57
-
58
-
59
-
60
Battery power (B+) (Battery)
61
LIN Communication Signal Input
62
P-CAN (High)
63
-
64
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 1] VS-/IP- (Virtual Ground)
65
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 1] Rc/Rp (Pumping Cell Current)
66
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 1] Rc (Adjust Resistance)
67
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 1] VS+ (NERNST Cell Current)
68
-
69
-
70
-
71
Start Relay (High) Control
72
-
73
-
74
Engine Control Relay Control
75
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 1] Heater Control
76
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 2] Heater Control
77
Vehicle Speed Input (IBU, VDC Moduel)
78
CCP-CAN (High)
79
CCP-CAN (Low)
80
-
81
-
82
-
83
Purge Control Solenoid Valve (PCSV) Control
84
Fuel Pump Relay Control [With Smart Key] Control
85
-
86
-
87
Integrated Body Control Unit (IBU) (IMMO, Data Line)
88
-
89
-
90
-
91
-
92
Variable Force Solenoid (VFS) [Bank 1 / Intake] Control
93
Variable Force Solenoid (VFS) [Bank 1 / Exhaust] Control

Repair procedures

Removal
1.
Turn ignition switch OFF and disconnect the battery negative (-) terminal.
2.
Disconnect the ECM Connector (A).

3.
Remove the ECM (B) after releasing the fixing hooks (A).

4.
Remove the ECM (B) after loosening the mounting bolts (A).
ECM Mounting bolt :
6.7 - 8.3 N.m (0.7 - 0.85 kgf.m, 5.1 - 6.1 lb-ft)

Installation
1.
Install in the reverse order of removal.
Inspection
1.
TEST ECM GROUND CIRCUIT : Measure resistance between ECM and chassis ground using the backside of ECM harness connector as ECM side check point. If the problem is found, repair it.
Specification : Below 1Ω
2.
TEST ECM CONNECTOR : Disconnect the ECM connector and visually check the ground terminals on ECM side and harness side for bent pins or poor contact pressure. If the problem is found, repair it.
3.
If problem is not found in Step 1 and 2, the ECM could be faulty. If so, make sure there were no DTC's before swapping the ECM with a new one, and then check the vehicle again. If DTC's were found, examine this first before swapping ECM.
4.
RE-TEST THE ORIGINAL ECM : Install the original ECM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original ECM with a new one. If problem does not occur, this is intermittent problem.
(Refer to "Intermittent Problem Inspection Procedure" in Basic Inspection Procedure)
Adjustment
ECM neutralization procedure (With immobilizer)
   
•
When replacing the ECM, the vehicle equipped with the immobilizer must be performed procedure as below.
[In the case of installing used ECM]
1)
Perform "ECM Neutral mode" procedure with diagnostic tool.
(Refer to Body Electrical System - "Immobilizer System")
2)
After finishing "ECM Neutral mode", perform "Keyteaching" procedure with diagnostic tool.
(Refer to Body Electrical System - "Immobilizer System")
[In the case of installing new ECM]
–
Perform "Key teaching" procedure with diagnostic tool.
(Refer to Body Electrical System - "Immobilizer System")
ECM Neutralization procedure (With smart key)
   
•
When replacing the ECM, the vehicle equipped with the smart key system (Button start) must be performed procedure as below.
[In the case of installing used ECM]
1)
Perform "ECM Neutral mode" procedure with diagnostic tool.
(Refer to Body Electrical System - "Immobilizer System")
2)
After finishing "ECM Neutral mode", insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the ECM learns the smart key information automatically.
[In the case of installing new ECM]
–
Insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the ECM learns the smart key information automatically.
ETC Module Learning Process
After replacing or re-installing the ECM, if you do not perform the ETC module learning procedure, the ETC module learning procedure must be performed since shift shock or failure code may be displayed.
(Refer to Engine Control System - "ETC System")
VIN Programming Procedure
VIN (Vehicle Identification Number) is a number that has the vehicle's information (Maker, Vehicle Type, Vehicle Line/Series, Body Type, Engine Type, Transmission Type, Model Year, Plant Location and so forth. For more information, please refer to the group "GI" in this SERVICE MANUAL). When replacing an ECM, the VIN must be programmed in the ECM. If there is no VIN in ECM memory, the fault code (DTC P0630) is set.
   
•
The programmed VIN cannot be changed. When writing the VIN, confirm the VIN carefully.
1.
Turn the ignition switch OFF.
2.
Connect the diagnostic tool to Data Link Connector (DLC).
3.
Turn the igntion switch ON.
4.
Select "Vehicle, Model Year, Engine, System".
5.
Select "Vehicle S/W Management".
6.
Select "Write VIN".

    Components Location1. Engine Control Module (ECM)2. Manifold Absolute Pressure Sensor (MAPS)3. Intake Air Temperature Sensor (IATS)4. Boost Pressure Sensor (BPS)5.

    Description and operation DescriptionBoost pressure sensor (BPS) is installed on top of intercooler output pipe to measures the pressure of supercharged air in the turbocharger.

    Other information:

    Hyundai Elantra (CN7) 2021-2025 Service Manual: Components and components location

    C

    Hyundai Elantra (CN7) 2021-2025 Service Manual: Description and operation

    DescriptionRear view camera will activate when the backup light is ON with the ignition switch ON and the shift lever in the R position.This system is a supplemental system that shows behind the vehicle through the AV monitor or the ECM (Reverse Display Room Mirror) mirror while backing-up.

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