Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 75
1A-247 Engine General Information and Diagnosis: For Petrol Engine Model
Fuel Injector Circuit Check
S6JB0A1114082
Wiring Diagram
12 Sensor 5 V power source circuit check
1) Disconnect connectors from ECM, TP sensor, MAP
sensor, A/C refrigerant pressure sensor (if equipped with
A/C), electric load current sensor (for J20 engine) and
accelerator pedal position (APP) sensor with ignition
switch turned OFF.
2) Measure each resistance between “C37-14”, “E23-56”,
“E23-54” and “C37-53” terminal of ECM connector and
vehicle body ground.
Is each resistance infinity?
Check internal short
circuit of TP sensor,
MAP sensor, A/C
refrigerant pressure
sensor (if equipped with
A/C), electric load
current sensor (for J20
engine) and/or
accelerator pedal
position (APP) sensor.
“GRY/RED”, “WHT”
and/or “ORN/BLU” wire
is shorted to ground
circuit.
Step
Action
Yes
No
BLK/WHT
BLU/BLK
BLU/BLK
WHT/GRN
BLK/RED
BLK/RED
BLK/RED
BLK/YEL
BLU
12V
5V
9
2
8
3
E23-29
E23-1
E23-60
10
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
C37-1
C37-2
C37-16
C37-17
BLU/BLK
BLU/BLK
PNK
PNK/GRN
PNK/BLU
PNK/BLK
E23-16
4
5
6
7
1
11
C37-15
C37-29
C37-48
BLK/ORN
C37-58
C37-30 BLK/ORN
BLK/YEL
BLK/YEL
BLK/YEL
I5JB0A110101-01
1. Fuse box No.2
4. No.1 injector
7. No.4 injector
10. “FI” fuse
2. Main relay
5. No.2 injector
8. “IG COIL” fuse
11. “IGN” fuse
3. ECM
6. No.3 injector
9. Ignition switch
Engine General Information and Diagnosis: For Petrol Engine Model 1A-248
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
Fuel injector check for operating sound
1) Using sound scope, check each injector for operating
sound at engine cranking.
Do all 4 injector make operating sound?
Fuel injectors circuit is
in good condition.
Go to Step 2.
2
Fuel injector resistance check
1) Disconnect connectors from fuel injectors with ignition
switch turned OFF.
2) Check for proper connection to fuel injector at each
terminals.
3) If OK, check all 4 fuel injectors for resistance referring to
“Fuel Injector On-Vehicle Inspection: For Petrol Engine
Model in Section 1G”.
Are all injectors in good condition?
Go to Step 3.
Faulty fuel injector.
3
Fuel injector insulation resistance check
1) Check that there is insulation between each fuel injector
terminal and engine ground.
Is there insulation?
Go to Step 4.
Faulty fuel injector.
4
Fuel injector power supply check
1) Measure voltage between each “BLU/BLK” wire terminal
of fuel injector connector and engine ground with ignition
switch turned ON.
Is voltage 10 – 14 V?
Go to Step 5.
“BLU/BLK” wire is open
or shorted to ground
circuit.
If it is in good condition,
go to “ECM Power and
Ground Circuit Check:
For Petrol Engine
Model”.
5
Wire circuit check
1) Turn OFF ignition switch.
2) Disconnect connectors from ECM.
3) Measure resistance between each “PNK”, “PNK/BLK”,
“PNK/GRN”, “PNK/BLU” wire terminal of fuel injector
connector and vehicle body ground.
Is resistance infinity?
Go to Step 6.
“PNK”, “PNK/BLK”,
“PNK/GRN” and/or
“PNK/BLU” wire(s) are
shorted to ground.
6
Wire circuit check
1) Measure voltage between each “PNK”, “PNK/BLK”,
“PNK/GRN”, “PNK/BLU” wire terminal of fuel injector
connector and vehicle body ground with ignition switch
turned ON.
Is voltage 0 V?
Go to Step 7.
“PNK”, “PNK/BLK”,
“PNK/GRN” and/or
“PNK/BLU” wire(s) are
shorted to power supply
circuit.
1A-249 Engine General Information and Diagnosis: For Petrol Engine Model
Fuel Pump and Its Circuit Check
S6JB0A1114083
Wiring Diagram
7
Fuel injector drive signal check
1) Connect connectors to each fuel injector and ECM with
ignition switch turned OFF.
2) Turn ON ignition switch.
3) Measure voltage between each “C37-1”, “C37-2”, “C37-
16”, “C37-17” terminal of ECM connector and vehicle
body ground.
Is voltage 10 – 14 V?
Check fuel injector
referring to “Fuel
Injector Inspection: For
Petrol Engine Model in
Section 1G”.
If check result is
satisfactory, substitute a
known-good ECM and
recheck.
“PNK”, “PNK/BLK”,
“PNK/GRN” and/or
“PNK/BLU” wire(s) are
open circuit.
Step
Action
Yes
No
E23-1
E23-60
E23-15
BLU
BLU/BLK
BLK/RED
BLK/RED
BLU/BLK
E23-29
BLK/WHT
WHT/GRN
BLK/WHT
BLK/WHT
PNK
BLK
WHT/GRN
BLK/YEL
7
6
4
3
2
5
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/RED
1
E23-16
BLU/BLK
BLU/BLK
C37-15
C37-29
C37-48
BLK/ORN
C37-58
C37-30 BLK/ORN
BLK/YEL
BLK/YEL
BLK/YEL
8
9
I5JB0A110102-01
1. Fuse box No.2
4. Fuel pump relay
7. Ignition switch
2. Main relay
5. Fuel pump
8. “FI” fuse
3. ECM
6. “IG COIL” fuse
9. “IGN” fuse
Engine General Information and Diagnosis: For Petrol Engine Model 1A-250
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
Fuel pump control system check for operation
Is fuel pump heard to operate 2 sec. after ignition switch is
turned ON?
Fuel pump circuit is in
good condition.
Go to Step 2.
2
Fuel pump relay power supply check
1) Disconnect fuel pump relay from fuse box No.2 with
ignition switch turned OFF.
2) Check for proper connection to fuel pump relay at each
terminal.
3) If OK, turn ON ignition switch, measure voltage between
“BLK/WHT” wire terminal of fuel pump relay connector
and engine ground.
Is voltage 10 – 14 V?
Go to Step 3.
“BLK/WHT” wire is open
or shorted to ground
circuit.
3
Fuel pump relay power supply check
1) Turn ON ignition switch, measure voltage between “BLU/
BLK” wire terminal of fuel pump relay connector and
engine ground.
Is voltage 10 – 14 V?
Go to Step 4.
“BLU/BLK” wire is open
circuit.
4
Fuel pump relay check
1) Check fuel pump relay referring to “Control Relay
Inspection: For Petrol Engine Model in Section 1C”.
Is relay in good condition?
Go to Step 5.
Faulty relay.
5
Fuel pump relay drive signal check
1) Connect fuel pump relay to fuse box No.2.
2) Connect voltmeter between “E23-15” terminal of ECM
connector and vehicle body ground.
3) Measure voltage 2 second after ignition switch is turned
ON.
Is voltage 10 – 14 V?
Go to Step 6.
“WHT/GRN” wire is
open circuit or shorted
to ground circuit.
I2RH01110132-01
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