Suzuki Grand Vitara JB416 / JB420 (ESP model). Manual — part 18
1A-68 Engine General Information and Diagnosis:
Reference waveform No.29
Oil control valve signal with engine racing (for M16
engine)
Reference waveform No.30
CAN communication line signal with ignition switch
turned ON
Reference waveform No.31
Ignition coil signal and fuel injector signal with engine
cranking
Measurement
terminal
CH1: “C37-60” to “C37-59”
Oscilloscope
setting
CH1: 5 V/DIV
TIME: 400
µs/DIV
Measurement
condition
• After warmed up to normal
operating temperature
• Drive vehicle at 20 km/h (12 mph)
and depress accelerator pedal
fully
1. Accelerator pedal depressed fully
2. Accelerator pedal depressed partially
3. Oil control valve signal
4. ON signal
5. OFF signal
Measurement
terminal
CH1: “E23-4” to “C37-58”
CH2: “E23-19” to “C37-58”
Oscilloscope
setting
CH1: 1 V/DIV, CH2: 1 V/DIV
TIME: 40
µs/DIV
Measurement
condition
Ignition switch turned ON
(Signal pattern is depending on
communication data)
1. CAN communication line signal (High)
2. CAN communication line signal (Low)
I4RS0B110075-01
I5JB0A110094-01
Measurement
terminal
CH1: “C37-52” to “C37-58”
CH2: “C37-21” to “C37-58”
CH3: “C37-1” to “C37-58”
CH4: “C37-22” to “C37-58”
Oscilloscope
setting
CH1: 5 V/DIV, CH2: 5 V/DIV
CH3: 50 V/DIV, CH4: 10 V/DIV
TIME: 200 ms/DIV
Measurement
condition
• After warmed up to normal
operating temperature
• Engine at cranking
[A]: For J20 engine
[B]: For M16 engine
1. Cylinder reference signal (CMP reference signal)
2. Ignition coil signal
3. No.1 fuel injector signal
4. Engine start signal
I5JB0A110095-01
Engine General Information and Diagnosis: 1A-69
Resistance Check
1) Remove ECM from its bracket referring to “Engine Control Module (ECM) Removal and Installation in Section 1C
in related manual”.
CAUTION
!
Never touch terminals of ECM itself or connect voltmeter or ohmmeter (2).
2) Connect special tool to ECM connectors securely.
NOTE
Do not connect the other connector of special tool to ECM.
3) Check resistance between each pair of terminals of disconnected connectors (1) as listed in the following table.
CAUTION
!
• Be sure to connect ohmmeter probe from wire harness side of coupler.
• Be sure to turn OFF ignition switch for this check.
• Resistance in the following table represents that measured when parts temperature is 20
°C (68 °F).
1
2
I4RS0A110086-02
Terminals
Circuit
Standard resistance
Condition
E23-60 to E23-29
Main relay
160 – 240
Ω
Battery disconnected
and ignition switch
turned ON
E23-15 to E23-29
Fuel pump relay
160 – 240
Ω
—
C37-16 to E23-1/16 No.3 fuel injector
10.8 – 18.2
Ω
—
C37-17 to E23-1/16 No.4 fuel injector
C37-5 to E23-1/16 EGR valve (stepping motor No.1 coil)
20 – 31
Ω
—
C37-13 to E23-1/16 EVAP canister purge valve
28 – 35
Ω
—
C37-2 to E23-1/16 No.2 fuel injector
10.8 – 18.2
Ω
—
C37-6 to E23-1/16 EGR valve (stepping motor No.2 coil)
20 – 31
Ω
—
C37-3 to E23-1/16 EGR valve (stepping motor No.4 coil)
C37-4 to E23-1/16 EGR valve (stepping motor No.3 coil)
C37-1 to E23-1/16 No.1 fuel injector
10.8 – 18.2
Ω
—
C37-33 to E23-1/16 Intake manifold tuning vacuum solenoid valve
33 – 45
Ω
—
C37-60 to C37-59
Oil control valve (for M16 engine)
6 – 15
Ω
—
E23-50 to E23-1/16 Throttle actuator control relay
160 – 240
Ω
—
1A-70 Engine General Information and Diagnosis:
A/C System Circuits Check
S5JB0E1104085
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
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
Engine General Information and Diagnosis: 1A-71
Troubleshooting
NOTE
• Before performed troubleshooting, be sure to read the “Precautions of ECM Circuit Inspection in
related manual”.
• 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”.
• 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.
Step
Action
Yes
No
1
Reception data check from BCM
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch.
3) Check DTC for reception data from BCM.
Is there DTC P1678?
Go to applicable DTC
diag. flow.
Go to Step 2.
2
DTC check of HVAC control module
1) Check HVAC control module for DTC.
Is there DTC(s)?
Go to applicable DTC
diag. flow.
Go to Step 3.
3
A/C switch signal circuit check
1) Start engine and select “DATA LIST” mode on scan tool.
2) Check A/C switch signal under following conditions
respectively.
A/C switch signal
Engine running, A/C switch OFF: OFF
Engine running, A/C switch ON and blower speed
selector turned 1st position or more: ON
Is check result satisfactory?
Go to Step 4.
Check HVAC control
module and its circuit.
4
DTC check of ECT sensor circuit
1) Check ECM for DTC of ECT sensor circuit.
Is there DTC P0116, DTC P0117 or DTC P0118?
Go to applicable DTC
diag. flow.
Go to Step 5.
5
Radiator cooling fan control system check
Is radiator cooling fan started when A/C and blower speed
selector switch are turned ON with engine running?
Go to Step 11.
Go to Step 6.
6
Radiator cooling fan control circuit check
1) Check DTC with scan tool.
Is DTC P0480 displayed?
Go to “DTC P0480: Fan
1 (Radiator Cooling
Fan) Control Circuit in
related manual”.
Go to Step 7.
7
Evaporator temperature sensor check
1) Check evaporator temperature sensor referring to “A/C
Evaporator Temperature Sensor Inspection in Section
7B in related manual”.
Is resistance within specification?
Go to Step 8.
Faulty evaporator
temperature sensor.
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