Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 76
1A-251 Engine General Information and Diagnosis: For Petrol Engine Model
6
Fuel pump relay drive signal check
1) Measure voltage within 2 second after ignition switch is
turned ON.
Is voltage 0 – 1 V?
Go to Step 7.
Substitute a known-
good ECM and recheck.
7
Wire circuit check
1) Turn OFF ignition switch.
2) Detach fuel tank referring to “Fuel Tank Removal and
Installation: For Petrol Engine Model in Section 1G”.
3) Disconnect connector from fuel pump.
4) Measure resistance between “PNK” wire terminal of fuel
pump connector and vehicle body ground.
Is resistance infinity?
Go to Step 8.
“PNK” wire is shorted to
ground.
8
Fuel pump circuit check
1) Connect service wire between “E23-15” terminal of ECM
connector and vehicle body ground.
2) Turn ON ignition switch, measure voltage between
“PNK” terminal at fuel pump connector and vehicle body
ground.
Is voltage 10 – 14 V?
Go to Step 9.
“PNK” wire is open
circuit.
9
Fuel pump circuit check
1) Turn OFF ignition switch.
2) Measure resistance between “BLK” wire terminal at fuel
pump connector and vehicle body ground.
Is resistance less than 5
Ω
?
Faulty fuel pump.
“BLK” wire is open
circuit.
Step
Action
Yes
No
Engine General Information and Diagnosis: For Petrol Engine Model 1A-252
Fuel Pressure Check
S6JB0A1114084
System Diagram
Special tool
(A): 09912–58442
(B): 09912–58432
(C): 09912–58490
Troubleshooting
NOTE
Before using following flow, check to make sure that battery voltage is higher than 11 V. If battery
voltage is low, pressure becomes lower than specification even if fuel pump and line are in good
condition.
4
(C)
(B)
(A)
1
2
3
I2RH01110133-01
1. Injector
2. Delivery pipe
3. Fuel pressure regulator
4. Fuel filter and fuel pump
Step
Action
Yes
No
1
Fuel pump operating sound check
1) Remove fuel filler cap and then turn ON ignition switch.
Can you hear operating sound?
Go to Step 2.
Go to “Fuel Pump and
Its Circuit Check: For
Petrol Engine Model”.
2
Fuel pressure check
1) Check fuel pressure referring to “Fuel Pressure
Inspection: For Petrol Engine Model in Section 1G”.
Is check result satisfactory?
Go to Step 3.
Go to Step 6.
3
Fuel pressure check
1) Start engine and warm it up to normal operating
temperature.
2) Keep engine speed at 4000 rpm.
Does fuel pressure show about the same value as Step 2?
Go to Step 4.
Go to Step 8.
4
Fuel line check
1) Check fuel pipe, fuel hose and joint for fuel leakage.
Are they in good condition?
Go to Step 5.
Repair or replace
defective part.
1A-253 Engine General Information and Diagnosis: For Petrol Engine Model
5
Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or
deform.
Are they in good condition?
Faulty fuel pressure
regulator.
Repair or replace
damaged or damaged
part.
6
Was fuel pressure higher than specification in Step 2?
Go to Step 7.
Go to Step 8.
7
Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or
deform.
Are they in good condition?
Faulty fuel pressure
regulator.
Repair or replace
damaged or damaged
part.
8
Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or
deform.
Are they in good condition?
Clogged fuel filter, faulty
fuel pump, faulty fuel
pressure regulator or
fuel leakage from hose
connection in fuel tank.
Repair or replace
defective part.
Step
Action
Yes
No
Engine General Information and Diagnosis: For Petrol Engine Model 1A-254
A/C System Circuits Check
S6JB0A1114085
Wiring Diagram
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”.
• When A/C evaporator outlet air temp. is below 0
°C (32 °F) (for J20 engine) or 1.3 °C (34.3 °F) (for M16
engine), A/C remains OFF (“E23-49” terminal voltage becomes 10 – 14 V). This condition is not
abnormal.
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
5V
RED/BLK
E23-46
E23-47
BLU/RED
BLU/YEL
BLU/BLK
E23-48
PPL/YEL
GRY/GRN
C37-24
C37-57
BLK
RED
YEL/GRN
RED/YEL
BLK
BLU
BLU
BLU/WHT
YEL/GRN
5V
WHT/BLU
WHT/RED
E23-4
E23-19
RED
WHT
WHT/BLU
WHT/RED
RED
WHT
5V
PNK/GRN
YEL/RED
WHT/BLK
BLK/RED
12V
PNK
*RED
GRY/RED
GRY/BLK
C37-14
C37-12
WHT/RED
E23-49
YEL/GRN
YEL/GRN
5V
1
2
4
9
11
12
15
16
5
8
14
13
7
10
3
6
I5JB0A110103-02
1. BCM
6. “IG2 SIG” fuse
11. Radiator cooling fan relay No.2
16. ECT sensor
2. ABS / ESP
® control module
7. “CPRSR” fuse
12. Radiator cooling fan relay No.3
*: For M16 engine
3. HVAC control module
8. Compressor relay
13. Radiator cooling fan No.1
4. ECM
9. Compressor
14. Radiator cooling fan No.2
5. Evaporator temperature sensor
10. Radiator cooling fan relay No.1
15. A/C refrigerant pressure sensor
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