Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual — part 13
1A-48 Engine General Information and Diagnosis:
Inspection of ECM and Its Circuits
S5JB0E1104080
ECM and its circuits can be checked by measuring voltage, pulse signal and resistance with special tool connected.
CAUTION
!
ECM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ECM
with ECM connectors disconnected from it.
Voltage Check
1) Remove ECM (1) from its bracket referring to “Engine Control Module (ECM) Removal and Installation in Section
1C in related manual”.
2) Connect special tool between ECM and ECM connectors securely.
Special tool
(A): 09933–06320
3) Check voltage and/or pulse signal using voltmeter (2) and oscilloscope (3).
NOTE
• As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition
switch is turned ON.
• Voltage with asterisk (*) cannot be measured with voltmeter because it is pulse signal. Use
oscilloscope for its check if necessary.
• Before performed this inspection, be sure to read the “Precautions of ECM Circuit Inspection in
related manual”.
Viewed from harness side
1
2
3
(A)
I5JB0A110073-01
E23
C37
3
4
18
19
5
6
7
10
11
17
20
47
46
49
50
51
21
22
52
16
25
9
24
14
29
55
57
54 53
59
60
58
2
26
27
28
15
30
56
48
32
31
34
35
36
37
40
42
39 38
44
45
43
41
33
1
12
13
23
8
3
4
18
19
5
6
7
10
11
17
20
47
46
49
50
51
21
22
52
16
25
9
24
14
29
55
57
54 53
59
60
58
2
26
27
28
15
30
56
48
32
31
34
35
36
37
40
42
39 38
44
45
43
41
33
1
12
13
23
8
I4RS0A110055-01
Engine General Information and Diagnosis: 1A-49
Terminal
No.
Wire
color
Circuit
Normal voltage
Condition
Remarks
C37-1
PNK
Fuel injector No.1
10 – 14 V
Ignition switch turned ON.
—
*0 – 0.6 V
↑↓
10 – 14 V
Engine running at idle
after warmed up engine.
Output signal is active low
pulse. Pulse frequency
varies depending on
engine speed.
C37-2
PNK/
BLK
Fuel injector No.2
10 – 14 V
Ignition switch turned ON.
—
*0 – 0.6 V
↑↓
10 – 14 V
waveform No.1: ” and
“Reference waveform
Engine running at idle
after warmed up engine.
Output signal is active low
pulse. Pulse frequency
varies depending on
engine speed.
C37-3
YEL/
GRN
EGR valve
(stepper motor coil
3)
10 – 14 V
Ignition switch turned ON.
—
*0 – 1 V
↑↓
10 – 14 V
Ignition switch is turned to
ST (cranking) position.
Output signal is active low
duty pulse. Number of
pulse generated times
varies depending on
vehicle condition.
C37-4
YEL
EGR valve
(stepper motor coil
4)
10 – 14 V
Ignition switch turned ON.
—
*0 – 1 V
↑↓
10 – 14 V
Ignition switch is turned to
ST (cranking) position.
Output signal is active low
duty pulse. Number of
pulse generated times
varies depending on
vehicle condition.
C37-5
YEL/
BLK
EGR valve
(stepper motor coil
1)
10 – 14 V
Ignition switch turned ON.
—
*0 – 1 V
↑↓
10 – 14 V
Ignition switch is turned to
ST (cranking) position.
Output signal is active low
duty pulse. Number of
pulse generated times
varies depending on
vehicle condition.
C37-6
YEL/
RED
EGR valve
(stepper motor coil
2)
10 – 14 V
Ignition switch turned ON.
—
*0 – 1 V
↑↓
10 – 14 V
Ignition switch is turned to
ST (cranking) position.
Output signal is active low
duty pulse. Number of
pulse generated times
varies depending on
vehicle condition.
C37-7
BLU/
ORN
Power steering
pump pressure
switch signal
10 – 14 V
Ignition switch turned ON.
—
0 – 1 V
With engine at idle speed,
turning steering wheel to
the right or left as far as it
stops.
C37-8
BRN/
RED
(for M16
engine)
BRN/
BLK (for
J20
engine)
Generator field coil
monitor signal
10 – 14 V
Ignition switch turned ON.
Signal is duty pulse. Duty
ratio varies depending on
vehicle condition.
*0 – 1 V
↑↓
10 – 14 V
waveform No.5: ” and
“Reference waveform
Engine running at idle
after warmed up engine.
1A-50 Engine General Information and Diagnosis:
C37-9
BLU
Electric load
current sensor
signal (for J20
engine)
0.5 – 1.0 V
Ignition switch turned ON.
—
1.3 – 1.7 V
Run engine at 2000 rpm,
headlight switch turned
ON.
1.8 – 2.4 V
Run engine at 2000 rpm,
headlight switch ON and
blower selector at HI
position.
C37-10
GRN/
WHT
CO adjusting
resistor signal (for
J20 engine, if
equipped)
0 – 5 V
Ignition switch turned ON.
—
C37-11
RED
Oxygen signal of
heated oxygen
sensor-2
4 – 5 V
Ignition switch turned ON.
—
*Approx. 0.15 V
waveform No.7: ” and
“Reference waveform
Engine running at idle
after warmed up engine.
C37-12
GRY/
BLK
A/C refrigerant
pressure sensor
signal (if equipped
with A/C)
1.38 – 1.52 V
Engine running, A/C
switch OFF and blower
selector at OFF position,
A/C refrigerant pressure:
800 kPa (116 psi)
—
2.15 – 2.38 V
Engine running, A/C
switch ON and blower
selector at 1st position or
more, A/C refrigerant
pressure: 1400 kPa (203
psi)
2.67 – 2.95 V
Engine running, A/C
switch ON and blower
selector at 1st position or
more, A/C refrigerant
pressure: 1800 kPa (261
psi)
C37-13
GRN/
BLK
EVAP canister
purge valve output
10 – 14 V
Ignition switch turned ON
with engine at stop.
—
*0 – 0.6 V
↑↓
10 – 14 V
Set EVAP canister purge
valve at 52% by using
“Misc Test” of scan tool.
Output signal is active low
duty pulse. Duty ratio
varies depending on
vehicle condition.
C37-14
GRY/
RED
Output of 5 V
power source for
MAP sensor, A/C
refrigerant
pressure sensor,
electric load
current sensor (for
J20 engine) and
CO adjusting
resistor (if
equipped)
4.5 – 5.5 V
Ignition switch turned ON.
—
C37-15
BLK/
ORN
Ground for ECM
Below 0.3 V
Ignition switch turned ON.
—
Terminal
No.
Wire
color
Circuit
Normal voltage
Condition
Remarks
Engine General Information and Diagnosis: 1A-51
C37-16
PNK/
GRN
Fuel injector No.3
10 – 14 V
Ignition switch turned ON.
—
*0 – 0.6 V
↑↓
10 – 14 V
waveform No.1: ” and
“Reference waveform
Engine running at idle
after warmed up engine.
Output signal is active low
pulse. Pulse frequency
varies depending on
engine speed.
C37-17
PNK/
BLU
Fuel injector No.4
10 – 14 V
Ignition switch turned ON.
—
*0 – 0.6 V
↑↓
10 – 14 V
waveform No.1: ” and
“Reference waveform
Engine running at idle
after warmed up engine.
Output signal is active low
pulse. Pulse frequency
varies depending on
engine speed.
C37-18
BRN/
YEL
Ignition coil No.4
(for J20 engine)
0 – 0.6 V
Ignition switch turned ON.
—
*0 – 0.6 V
↑↓
3 – 5 V
and “Reference
Engine running at idle
after warmed up engine.
Output signal is active
high pulse. Pulse
frequency varies
depending on engine
speed.
C37-19
BRN/
WHT
Ignition coil No.3
(for J20 engine)
0 – 0.6 V
Ignition switch turned ON.
—
*0 – 0.6 V
↑↓
3 – 5 V
and “Reference
Engine running at idle
after warmed up engine.
Output signal is active
high pulse. Pulse
frequency varies
depending on engine
speed.
C37-20
BRN/
BLK
Ignition coil No.2
and No.3 (for M16
engine)
0 – 0.6 V
Ignition switch turned ON.
—
Ignition coil No.2
(for J20 engine)
*0 – 0.6 V
↑↓
3 – 5 V
and “Reference
Engine running at idle
after warmed up engine.
Output signal is active
high pulse. Pulse
frequency varies
depending on engine
speed.
C37-21
BRN
Ignition coil No.1
and No.4 (for M16
engine)
0 – 0.6 V
Ignition switch turned ON.
—
Ignition coil No.1
(for J20 engine)
*0 – 0.6 V
↑↓
3 – 5 V
and “Reference
Engine running at idle
after warmed up engine.
Output signal is active
high pulse. Pulse
frequency varies
depending on engine
speed.
C37-22
BLK/
YEL
Starting motor
control relay output
0 – 1 V
Ignition switch turned ON.
—
8 – 14 V
Ignition switch turned to
ST (engine cranking)
position.
C37-23
—
—
—
—
—
Terminal
No.
Wire
color
Circuit
Normal voltage
Condition
Remarks
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