Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 74
1A-243 Engine General Information and Diagnosis: For Petrol Engine Model
ECM Power and Ground Circuit Check
S6JB0A1114081
Wiring Diagram
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
BLK/WHT
BLU/BLK
BLU/BLK
BLU/BLK
BLK/RED
BLK/RED
BLK/RED
BLK/YEL
BLU
12V
5V
2
1
3
12
13
14-1
15-1
15-2
14-2
4
6
E23-29
E23-1
E23-60
E23-16
9
10
11
WHT
E23-2
WHT/GRN
GRY/RED
BLU
RED/WHT
GRY/GRN
C37-14
C37-9
C37-55
C37-57
GRY/BLK
C37-12
E23-55
BLU/YEL
BLU/RED
C37-45
C37-44
5
C37-15
C37-29
C37-48
BLK/ORN
C37-58
C37-30 BLK/ORN
BLK/YEL
BLK/YEL
BLK/YEL
E23-56
E23-54
E23-53
E23-52
E23-51
C37-53
C37-54
C37-40
C37-41
WHT/BLU
WHT
ORN
ORN/BLU
BLU/GRN
BLU/YEL
WHT
BLK
RED
GRN
WHT
WHT
8
7
I5JB0A110096-01
1. Fuse box No.2
6. ECM
11. Electric load current sensor (for J20
engine)
15-1. TP sensor (main)
2. Ignition switch
7. “IG ACC” fuse
12. MAP sensor
15-2. TP sensor (sub) (for AMT model)
3. Main relay
8. “FI” fuse
13. A/C refrigerant pressure sensor (if
equipped with A/C)
4. Junction block
9. “DOME” fuse
14-1. Accelerator pedal position (APP)
sensor (main)
5. “IG COIL” fuse
10. DLC
14-2. Accelerator pedal position (APP)
sensor (sub)
Engine General Information and Diagnosis: For Petrol Engine Model 1A-244
Circuit Description
When the ignition switch is turned ON, the main relay turns ON (the contact point closes) and the main power is
supplied to ECM. And then ECM supplies 5 V power to each sensor (electric load current sensor (for J20 engine),
MAP sensor, A/C refrigerant pressure sensor, APP sensor and TP sensor).
If 5 V power circuit to each sensors from ECM is shorted to ground, ECM stops engine and emission control operation.
Troubleshooting
NOTE
• Before performed troubleshooting, be sure to read the “Precautions of ECM Circuit Inspection: For
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits: For
Petrol Engine Model”.
Step
Action
Yes
No
1
Circuit fuse check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection to ECM connector at “E23-
2”, “E23-29”, “E23-60”, “E23-1”, “E23-16”, “C37-15”,
“C37-30”, “C37-29”, “C37-48” and “C37-58” terminals.
3) If OK, check “RADIO” fuse and “IG COIL” fuse for
blowing.
Are “DOME” fuse and “IG COIL” fuse in good condition?
Go to Step 2.
Replace fuse (s) and
check for short in
circuits connected to
fuse(s).
2
Power supply circuit check
1) Measure voltage between “E23-2” terminal of ECM
connector and body ground.
Is voltage 10 – 14 V?
Go to Step 3.
“WHT” wire is open
circuit.
3
Ignition signal check
1) Turn ignition switch to ON position.
2) Measure voltage between “E23-29” terminal of ECM
connector and body ground.
Is voltage 10 – 14 V?
Go to Step 4.
“BLK/WHT” or “BLK/
YEL” wire is open
circuit.
1A-245 Engine General Information and Diagnosis: For Petrol Engine Model
4
Main relay circuit check
1) Turn ignition switch to OFF position.
2) Check “FI” fuse (1) (20 A) in fuse box No.2 for blowing.
For J20 engine
For M16 engine
3) If OK, measure voltage between “E23-60” terminal of
ECM connector and body ground.
Is voltage 10 – 14 V?
Go to Step 5.
Go to Step 9.
5
Main relay circuit check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Turn ignition switch to ON position.
3) Measure voltage between “E23-60” terminal of ECM
connector and body ground.
Is voltage 0 – 1 V?
Go to Step 7.
Go to Step 6.
6
ECM ground circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from ECM.
3) Measure resistance between each “C37-15”, “C37-30”,
“C37-29”, “C37-48” and “C37-58” terminals of ECM
connector and body ground.
Is resistance 1
Ω
or less?
Substitute a known-
good ECM and recheck.
“BLK/ORN” or “BLK/
YEL” wire is open or
high resistance circuit.
7
Main relay circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Using service wire, ground “E23-60” terminal of ECM
connector and measure voltage between each “E23-1”
and “E23-16” terminals of ECM connector and body
ground.
Is voltage 10 – 14 V?
Go to Step 11.
Go to Step 8.
Step
Action
Yes
No
1
I5JB0A110097-02
1
I5JB0A110098-02
Engine General Information and Diagnosis: For Petrol Engine Model 1A-246
8
Main relay circuit check
1) Remove main relay (1) from fuse box No.2.
For J20 engine
For M16 engine
2) Check for proper connection to main relay connector at
“BLU/YEL” and “BLK/RED” wire terminals.
3) If OK, measure resistance between each “E23-1” and
“E23-16” wire terminals of ECM connector and “BLU/
BLK” wire terminal of main relay connector.
Is resistance 1
Ω
or less?
Go to Step 9.
“BLU/BLK” wire is open
circuit or high resistance
circuit.
9
Main relay circuit check
1) Remove main relay from fuse box No.2 with ignition
switch turned OFF.
2) Measure voltage between “BLK/RED” wire terminal of
main relay connector and body ground.
Is voltage 10 – 14 V?
Go to Step 10.
“BLK/RED” wire is open
circuit.
10 Main relay check
1) Check main relay referring to “Control Relay Inspection:
For Petrol Engine Model in Section 1C”.
Is main relay in good condition?
“BLU” wire is open or
high resistance circuit.
Replace main relay.
11 Sensor 5 V power source circuit check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Turn ON ignition switch, measure each voltage between
“C37-14”, “E23-56”, “E23-53” and “C37-53” terminal of
ECM connector and vehicle body ground.
Is each voltage 4 – 6 V?
ECM power and ground
circuit is in good
condition.
Go to Step 12.
Step
Action
Yes
No
1
I5JB0A110099-02
1
I5JB0A110100-02
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