Kia Optima DL3: Engine Control System / Engine Control Module (ECM)

Kia Optima DL3 2019-2025 Service and Repair Manual / Engine Control / Fuel System / Engine Control System / Engine Control Module (ECM)

Components and components location

Component Location

1. Engine Control Module (ECM)


Schematic diagrams

Connector and Terminal function

ECM Terminal Function

[Connector A]

Pin
Function
Connected to
1
-

2
ETC Motor [+] control output
ETC Motor
3
-

4
-

5
-

6
-

7
-

8
-

9
-

10
-

11
-

12
-

13
-

14
-

15
Sensor ground
Engine Coolant Temperature Sensor (ECTS)
16
Engine Coolant Temperature Sensor (ECTS) signal input
Engine Coolant Temperature Sensor (ECTS)
17
Throttle Position Sensor (TPS) 2 signal input
Throttle Position Sensor (TPS) 2 [ETC Module]
18
-

19
-

20
-

21
Sensor power (+5V)
Manifold Absolute Pressure Sensor (MAPS)
Camshaft Position Sensor (CMPS) [Bank 1 / Intake]
22
-

23
ETC Motor [-] control output
ETC Motor [ETC Module]
24
-

25
-

26
-

27
-

28
-

29
-

30
-

31
Electrical load signal input (FR)
Alternator
32
-

33
-

34
-

35
-

36
-

37
Sensor ground
Throttle Position Sensor (TPS) 1, 2 [ETC Module]
38
Throttle Position Sensor (TPS) 1 signal input
Throttle Position Sensor (TPS) 1 [ETC Module]
39
-

40
Alternator PWM control output
Alternator
41
-

42
Sensor power (+5V)
Throttle Position Sensor (TPS) 1, 2 [ETC Module]
43
-

44
-

45
-

46
-

47
-

48
-

49
-

50
-

51
-

52
-

53
-

54
-

55
-

56
Sensor ground
Camshaft Position Sensor (CMPS) [Bank 1/Exhaust] 
57
-

58
-

59
-

60
-

61
Sensor ground
Manifold Absolute Pressure Sensor (MAPS)
62
Manifold Absolute Pressure Sensor (MAPS) signal input 
Manifold Absolute Pressure Sensor (MAPS)
63
Sensor power (+5V)
Camshaft Position Sensor (CMPS) [Bank 1 / Exhaust] 
65
-

66
-

67
-

68
-

69
-

70
-

71
-

72
-

73
-

74
Sensor ground
Crankshaft Position Sensor (CKPS)
75
-

76
-

77
Camshaft Position Sensor (CMPS) [Bank 1 / Exhaust] signal input
Camshaft Position Sensor (CMPS) [Bank 1 / Exhaust] 
78
Sensor ground
Camshaft Position Sensor (CMPS) [Bank 1 / Intake]
79
-

80
-

81
-

82
-

83
VG (Virtual Ground)
Heated Oxygen Sensor [Bank 1 / Sensor 1]
84
VRC (Current Adjust)
Heated Oxygen Sensor [Bank 1 / Sensor 1]
85
-

86
-

87
-

88
-

89
-

90
-

91
-

92
-

93
-

94
-

95
Crankshaft Position Sensor (CKPS) signal input
Crankshaft Position Sensor (CKPS)
96
-

97
-

98
Camshaft Position Sensor (CMPS) [Bank 1 / Intake] signal input
Camshaft Position Sensor (CMPS) [Bank 1 / Intake]
99
Sensor ground
Knock Sensor (KS)
100
Knock Sensor (KS) signal input
Knock Sensor (KS)
101
Intake Air Temperature Sensor (IATS) signal input
Intake Air Temperature Sensor (IATS)
102
-

103
-

104
VN (NERNST Cell Voltage)
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 1]
105
VIP (Current Pump)
Heated Oxygen Sensor [Bank 1 / Sensor 1]

[Connector B]

Pin
Function
Connected to
1
Power ground
Chassis Ground
2
Power ground
Chassis Ground
3
Battery power (B+)
Main Relay
4
Power ground
Chassis Ground
5
Battery power (B+)
Main Relay
6
Battery power (B+)
Main Relay
7
-

8
-

9
-

10
Accelerator Position Sensor (APS) 2 signal input
Accelerator Position Sensor (APS) 2
11
A/C Pressure Transducer (APT) signal input
A/C Pressure Transducer (APT)
12
-

13
-

14
Sensor power (+5V)
A/C Pressure Transducer (APT)
15
-

16
Sensor power (+5V)
Accelerator Position Sensor (APS) 2
17
Sensor power (+5V)
Accelerator Position Sensor (APS) 1
18
Main Relay control output
Main Relay
19
Fuel Pump Relay control output
Fuel Pump Relay
20
-

21
-

22
Injector (Cylinder #2) control output
Injector (Cylinder #3)
23
Injector (Cylinder #3) control output
Injector (Cylinder #3)
24
-

25
-

26
-

27
Accelerator Position Sensor (APS) 1 signal input
Accelerator Position Sensor (APS) 1
28
Sensor ground
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 2]
29
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 2] signal input
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 2]
30
-

31
-

32
-

33
-

34
Start Motor relay control output 
Start Motor relay 
35
CVVT Oil Control (OCV) Valve [Bank 1 / Exhaust] control output
CVVT Oil Control Valve (OCV) [Bank 1 / Exhaust] 
36
CVVT Oil Control (OCV) Valve [Bank 1 / Intake] control output
CVVT Oil Control Valve (OCV) [Bank 1 / Intake]
37
-

38
A/C Relay control output
A/C Relay
39
Injector (Cylinder #4) control output
Injector (Cylinder #3)
40
Ignition Coil (Cylinder #2) control output 
Ignition Coil (Cylinder #2)
41
Battery power (B+)
Ignition Switch
42
-　

43
-　

44
-　

45
Sensor ground
Accelerator Position Sensor (APS) 1
46
Sensor ground
Accelerator Position Sensor (APS) 2
47
-

48
-

49
-

50
Sensor ground
A/C Pressure Transducer (APT)
51
-

52
-

53
-

54
-

55
-

56
Injector (Cylinder #1) control output
Injector (Cylinder #1)
57
Ignition Coil (Cylinder #4) control output 
Ignition Coil (Cylinder #4)
58
-

59
LOCAL-CAN [Low]
Other control module, Data Link Connector (DLC)
60
P-CAN [Low]
Other control module, Data Link Connector (DLC)
61
Fuel Tank Level Sensor signal input
Fuel Tank Level Sensor (FLS)
62
-

63
-

64
-

65
Brake Light Switch signal input
Brake Switch
66
Start signal input
Ignition Switch
67
Engine speed signal output
Power Distribution Module (PDM)
68
Immobilizer communication line
Immobilizer control module 
69
-

70
-

71
Purge Control Solenoid Valve (PCSV) control output
Purge Control Solenoid Valve (PCSV)
72
-

73
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 1] Heater control output
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 1]
74
Ignition Coil (Cylinder #3) control output 
Ignition Coil (Cylinder #3)
75
Memory power (B+)
Engine Room Fuse & Relay Box (EMS ECU)
76
LOCAL-CAN [High]
Other control module, Data Link Connector (DLC)
77
C-CAN [High]
Other control module, Data Link Connector (DLC)
78
-

79
Vehicle speed signal input
ABS/ESC Control Unit
80
-

81
Wiper Switch Input Signal
Integrated Body Control Unit (IBU)
82
-

83
Brake Test Switch signal input
Brake Switch
84
-

85
-

86
Cooling Fan Relay control output
Cooling Fan Relay
87
-

88
Variable Intake Solenoid (VIS) Valve control output
Variable Intake Solenoid (VIS) Valve
89
-

90
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 2] Heater control output
Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 2]
91
Ignition Coil (Cylinder #1) control output 
Ignition Coil (Cylinder #1) [NON-Immobilizer type]

Repair procedures

Inspection
1.

The engine control system can be more quickly diagnosed for troubles by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")

KDS provides the following information.

(1)

Self diagnosis : Inspects and displays diagnostic trouble code (DTC)

(2)

Sensor data : Checks the system input/output value status

(3)

Forced operation : Checks the system operating status

(4)

Additional function : Controls system options, zero point adjustment and other functions
Component 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.
Removal
1.

Disconnect the negative battery terminal.
2.

Perform the oil pressure characteristics backup procedure using the KDS when replacing with a new ECM.
3.

Remove the air cleaner assembly.

(Refer to Engine Mechanical System - "Air Cleaner")

4.

Disconnect the ECM connector (A).
5.

Remove the TCM (A) by pulling it in the direction of arrow.
6.

Remove the bracket (A) by loosening the bolts.

Tightening torque :

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

Installation
1.

Install in the reverse order of removal.
2.

Perform the ECM reset and learning procedure by using the KDS after replacing the ECM.

(Engine Control Module (ECM) - "Adjustment")

Adjustment
  

Perform the following procedure when replacing ECM (New parts / Reused parts).

1.

Perform the neutral mode using the KDS when replacing with a reused ECM.

[Non-Smart Key]

[Smart Key]
2.

Perform the "Key Teaching" procedure by using the KDS.

[Non-Smart Key]

[Smart Key]

Turn IGN ON then OFF using the smart key or start button. Then the ECM learns information on the smart key automatically.
3.

Perform the VIN writing procedure by using the KDS.
4.

Perform the oil pressure characteristics input procedure using the KDS.
5.

Perform ETC module learning procedure

(Refer to Electronic Throttle Control System - "Adjustment")

6.

Perform TCM learning procedure.

(Refer to Automatic Transaxle Control System - "Adjustment")

    Description and operation Description If the Gasoline Engine Control system components (sensors, ECM, injector, etc.) fail, interruption to the fuel supply or failure to supply the proper amount of fuel for various engine operating conditions will result.

    Specifications Specification Throttle angle (°) Output voltage (V) [Vref = 5.0V] TPS1 TPS2 0 0.

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