Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 39
1A-103 Engine General Information and Diagnosis: For Petrol Engine Model
4
ECM voltage check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Check for proper connection of ECM connector at “C37-
24” terminal.
4) If OK, then turn ON ignition switch, measure voltage
between “C37-24” wire terminal of ECM connector and
vehicle body ground.
Is voltage about 4 – 6 V?
“PPL/YEL” wire is open
circuit. If wire and
connection are OK, go
to Step 5.
Go to Step 5.
5
ECT sensor harness voltage check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Turn ON ignition switch.
3) Measure voltage between “PPL/YEL” wire terminal of
ECT sensor connector and vehicle body ground.
Is voltage about 0 V?
Go to Step 6.
“PPL/YEL” wire is
shorted to other circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
6
ECT sensor harness resistance check
1) Measure resistance between “C37-24” terminal of ECM
connector and “PPL/YEL” wire terminal of ECT sensor
connector with ignition switch turn OFF.
Is resistance below 3
Ω
?
Go to Step 7.
“PPL/YEL” wire is high
resistance circuit.
7
ECT sensor ground circuit check
1) Connect connectors to ECM.
2) Check for proper connection of ECT sensor connector at
“GRY/GRN” wire terminal.
3) Measure resistance between “GRY/GRN” wire terminal
of ECT sensor connector and vehicle body ground.
Is resistance below 3
Ω
?
Go to Step 9.
Go to Step 8.
8
ECT sensor ground circuit check
1) Measure resistance between “C37-57” terminal of ECM
connector and vehicle body ground.
Is resistance below 3
Ω
?
“GRY/GRN” wire is
open circuit or high
resistance circuit. Poor
“C37-57” connection.
Faulty ECM ground
circuit. If circuit is OK,
substitute a known-
good ECM and recheck.
9
ECT sensor for performance check
1) Check ECT sensor according to “Engine Coolant
Temperature (ECT) Sensor Inspection: For Petrol
Engine Model in Section 1C”.
Is it in good condition?
Substitute a known-
good ECM and recheck.
Replace ECT sensor.
Step
Action
Yes
No
Engine General Information and Diagnosis: For Petrol Engine Model 1A-104
DTC P0122: Throttle Position Sensor (Main) Circuit Low
S6JB0A1114030
Wiring Diagram
DTC Detecting Condition and Trouble Area
NOTE
When DTC P0122 and P0222 are indicated together, it is possible that “WHT” wire open circuit.
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
12V
5V
BLU/BLK
BLU/BLK
BLK/RED
1
2
BLK/RED
BLK/RED
BLU
E23-1
E23-60
C37-15
C37-29
C37-48
BLK/ORN
C37-58
BLU/ORN
GRN
BLU/RED
BLU/YEL
BLU/RED
E23-16
E23-50
E23-17
C37-45
C37-44
1-1
1-2
1-3
3
4
5
8
6
7
10
9
E23-29
BLK/YEL
BLK/WHT
WHT/GRN
C37-30 BLK/ORN
BLK/YEL
BLK/YEL
BLK/YEL
BLU/BLK
BLU/BLK
WHT
BLK
RED
GRN
C37-53
C37-54
C37-40
C37-41
I5JB0A110041-01
1. Electric throttle body assembly
3. ECM
8. “IGN” fuse
1-1. Throttle actuator
4. Main relay
9. “IG COIL” fuse
1-2. Throttle position sensor (main)
5. Fuse box No.2
10. Ignition switch
1-3. Throttle position sensor (sub)
6. “THR MOT” fuse
2. Throttle actuator control relay
7. “FI” fuse
DTC detecting condition
Trouble area
Output voltage of throttle position sensor (main) is less than
0.3 V for specified time continuously.
(1 driving detection logic)
• Throttle position sensor (main) circuit
• Electric throttle body assembly
• ECM
1A-105 Engine General Information and Diagnosis: For Petrol Engine Model
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Keep the accelerator pedal at idle position for 2 seconds.
4) Keep the accelerator pedal at fully depressed position for 2 seconds.
5) Repeat Step 3) and 4) for 3 times.
6) Check DTC.
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting: For Petrol Engine Model”.
Step
Action
Yes
No
1
Was “Engine and Emission Control System Check”
performed?
Go to Step 2.
Go to “Engine and
Emission Control
System Check: For
Petrol Engine Model”.
2
Throttle position sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch, check “TP Sensor 1 Volt”
displayed on scan tool when accelerator pedal is idle
position and fully depressed.
Is displayed TP sensor value as described voltage in “Scan
Tool Data: For Petrol Engine Model”?
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
Go to Step 3.
3
ECM voltage check
1) Disconnect connector from electric throttle body
assembly with ignition switch turned OFF.
2) Check for proper connection to electric throttle body
assembly at “WHT”, “GRN” and “BLK” wire terminals.
For J20 engine
For M16 engine
3) If OK, measure voltage between “WHT” wire terminal of
electric throttle body assembly connector and engine
ground with ignition switch turned ON.
Is voltage 4 – 6 V?
Go to Step 6.
Go to Step 4.
"BLK"
"WHT"
"RED"
"GRN"
"BLU/YEL"
"BLU/RED"
I5JB0A110042-01
"BLU/RED"
"BLU/YEL"
"GRN"
"RED"
"WHT"
"BLK"
I5JB0A110043-01
Engine General Information and Diagnosis: For Petrol Engine Model 1A-106
4
ECM voltage check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Check for proper connection of ECM connector at “C37-
53” terminal.
4) If OK, measure voltage between “C37-53” terminal of
ECM connector and engine ground with ignition switch
turned ON.
Is voltage 4 – 6 V?
“WHT” wire is open or
high resistance circuit.
Go to Step 5.
5
Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “C37-53” terminal of ECM
connector and engine ground.
Is resistance infinity?
Substitute a known-
good ECM and recheck.
“WHT” wire is shorted to
ground circuit.
6
Wire harness check
1) Measure voltage between “BLK” wire terminal of electric
throttle body assembly connector and engine ground
with ignition switch turned ON.
Is voltage 4 – 6 V?
Go to Step 9.
Go to Step 7.
7
Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at “C37-
54” and “C37-41” terminals.
3) If OK, measure resistance between “GRN” and “BLK”
wire terminals of electric throttle body assembly
connector.
Is resistance infinity?
Go to Step 8.
“BLK” wire is shorted to
“GRN” wire.
8
Wire harness check
1) Measure resistance between “BLK” wire terminal of
electric throttle body assembly connector and engine
ground with ignition switch turned OFF.
Is resistance infinity?
Substitute a known-
good ECM and recheck.
“BLK” wire is shorted to
ground circuit.
9
Electric throttle body assembly check
1) Check throttle pedal position sensor referring to “Throttle
Position Sensor Performance Check” under “Electric
Throttle Body Assembly On-Vehicle Inspection: For
Petrol Engine Model in Section 1C”.
Is output voltage within specified value?
Substitute a known-
good ECM and recheck.
Replace electric throttle
body assembly.
Step
Action
Yes
No
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