Engine (Diagnostics)
ENGINE CONTROL MODULE (ECM) I/O SIGNAL
5. Engine Control Module (ECM) I/O Signal
S068526
A: ELECTRICAL SPECIFICATION
S068526A08
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EN(SOHCw/oOBD)-20
ENGINE CONTROL MODULE (ECM) I/O SIGNAL
Engine (Diagnostics)
nt
ECM
CHECK BOARD
Signal (V)
Note
Conte
Connec­tor No.
Terminal No.
Connec­tor No.
Terminal No.
Ignition SW ON (Engine OFF)
Engine ON (Idling)
Crankshaft position sensor
Signal (+)
E22
20
?
26
0
-7 to +7
Sensor output waveform
Signal (-)
E22
14
?
19
0
0
-
Shield
E22
21
?
25
0
0
-
Pressure sensor
Signal
E22
18
A
15
3.4 - 3.6
1.2 - 1.8
-
Power supply
E22
25
?
21
5
5
-
GND
E22
22
?
24
0
0
-
Throttle position sensor
Signal
E22
23
?
23
Fully closed: 0.2 - 1.0 Fully open: 4.2 - 4.7
-
Power supply
E22
25
?
21
5
5
-
GND
E22
22
?
24
0
0
-
Oxygen sensor
Signal
B84
22
D
47
0.6, or less
0 - 0.9
-
Shield
B84
15
?
38
0
0
-
Engine coolant tem­perature sensor
E22
24
?
22
0.4 - 2.4
0.4 - 2.4
After warm-up
Vehicle speed sen­sor
B84
33
D
53
0 or 5
0 or 5
"5" and "0" are repeatedly dis­played when vehicle is driven.
Intake air tempera­ture sensor
E22
17
?
16
2.3 - 2.5
1.4 - 1.6
After warm-up
A/C switch
B84
27
D
59
ON: 10 - 13 OFF: 0
ON: 13- 14 OFF: 0
-
Ignition switch
B84
28*
19
D
58*
50
10- 13
13 - 14
-
Neutral position switch (MT)
B84
26
D
60
ON: 10- 13 OFF: 0
- On MT vehicles; switch is ON when gear is in neutral position.
Neutral position switch (AT)
ST: 10- 13 ON: 0 OFF: 13- 14
- On AT vehicles; switch is ON when shift is in "N" or "P" position
Knock sensor
Signal
E22
16
?
17
2.5
2.5
Shield
E22
21
?
25
0
0
Test mode connec­tor
B84
19*
28
D
50*
58
10- 13
13 - 14
When connected: 0
Read memory con­nector
B84
20
D
49
10- 13
13 - 14
When connected: 0
Back-up power sup­ply
B84
34
D
52
10- 13
13 - 14
Ignition switch "OFF": 10-13
Control unit
power
B84
9
?
27
10- 13
13 - 14
-
supply
17
?
36
Ignition control
#1, #2
E22
3
?
5
0
1 -3.4
-
#3, #4
E22
9
?
12
0
1 -3.4
-
Fuel injec­tor
#1, #2
E22
7
?
1
10- 13
1 - 14
Waveform
#3, #4
E22
6
?
2
10- 13
1 - 14
Waveform
EN(SOHCw/oOBD)-21
Engine (Diagnostics)
ENGINE CONTROL MODULE (ECM) I/O SIGNAL
Content
ECM
CHECK BOARD
Signal (V)
Note
Connec­tor No.
Terminal No.
Connec­tor No.
Terminal No.
Ignition SWON (Engine OFF)
Engine ON (Idling)
Idle air control sole­noid valve
E22
4
A
4
-
1 - 13
Waveform
Fuel pump relay control
B84
3
?
33
ON: 0.5, or less OFF: 10- 13
0.5, or less
-
A/C relay control
B84
11
?
42
ON: 0.5, or less OFF: 10- 13
ON: 0.5, or less OFF: 13- 14
-
Radiator fan relay 1
B84
2
?
34
ON: 0.5, or less OFF: 10- 13
ON: 0.5, or less OFF: 13- 14
-
Radiator fan relay 2
B84
10
?
43
ON: 0.5, or less OFF: 10- 13
ON: 0.5, or less OFF: 13- 14
With A/C vehicles only
Self-shutoff control
B84
5
?
31
10- 13
13 - 14
-
Malfunction indicator lamp
B84
13
?
40
-
-
Light "ON": 1, or less Light "OFF": 10 - 14
Engine speed output
B84
6
?
30
-
0 - 13, or more
Waveform
Torque control signal
B84
18
D
51
8
8 - 9
-
VCC signal
B84
1
?
35
5
5
AT and without cata­lyst vehicles only
AT load signal
B84
29
D
57
3.4 - 3.6
1.2 - 1.8
-
Purge control sole­noid valve
E22
5
?
3
ON: 1, or less OFF: 10- 13
13 - 14
- Waveform - When connecting test mode connector
Power steering pres­sure switch
E22
26
?
20
10- 13
ON: 0 OFF: 13- 14
-
MT/AT identification
B84
16
?
37
MT: 0 AT: 5
MT: 0 AT: 5
-
Select monitor sig­nal
B84
24
?
45
-
-
-
32
D
54
GND (ignition sys­tem)
E22
10
?
11
0
0
-
GND (power supply)
E22
11
?
10
0
0
-
12
9
GND (control sys­tems)
E22
21
?
25
0
0
-
Immobilizer serial line
B84
23
D
46
-
-
-
31
55
*: RHD
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ENGINE CONTROL MODULE (ECM) I/O SIGNAL
Engine (Diagnostics)
B: HOW TO CHECK I/O SIGNAL
S068526H57
FOR ECM
- When checking I/O signal, connect ST between
ECM and ECM connector.
1) Prepare the ST.
ST 498307600 CHECK BOARD KIT
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(1)  CHECK BOARD
(2)  CHECK BOARD ADAPTER
2)  Turn ignition switch to OFF.
3)   Disconnect connectors from ECM.
4)  Connect connectors of CHECK BOARD ADAPTER to ECM and CHECK BOARD.
5)  Connect engine harness and bulkhead harness connectors to CHECK BOARD.
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