Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 40
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1A-107 Engine General Information and Diagnosis: For Petrol Engine Model
DTC P0123: Throttle Position Sensor (Main) Circuit High
S6JB0A1114031
Wiring Diagram
Refer to “DTC P0122: Throttle Position Sensor (Main) Circuit Low: For Petrol Engine Model”.
DTC Detecting Condition and Trouble Area
NOTE
When DTC P0123 and P0223 are indicated together, it is possible that “WHT” wire shorted to power
circuit and/or “GRN” wire open.
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”.
DTC detecting condition
Trouble area
Output voltage of throttle position sensor (main) is more than
4.7 V for specified time continuously.
(1 driving detection logic)
• Throttle position sensor (main) circuit
• Electric throttle body assembly
• ECM
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.
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Engine General Information and Diagnosis: For Petrol Engine Model 1A-108
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 5.
Go to Step 4.
4
Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at “C37-
53” terminal.
3) Measure voltage between “C37-53” terminal of ECM
connector and engine ground with ignition switch turned
ON.
Is voltage 0 V?
Substitute a known-
good ECM and recheck.
“WHT” wire is shorted
to power circuit.
5
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 6.
6
Wire harness 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” and “C37-54” terminals.
4) If OK, measure voltage between “C37-54” terminal of
ECM connector and engine ground with ignition switch
turned ON.
Is voltage 4 – 6 V?
“BLK” wire is open or
high resistance circuit.
Go to Step 7.
Step
Action
Yes
No
"BLK"
"WHT"
"RED"
"GRN"
"BLU/YEL"
"BLU/RED"
I5JB0A110042-01
"BLU/RED"
"BLU/YEL"
"GRN"
"RED"
"WHT"
"BLK"
I5JB0A110043-01
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1A-109 Engine General Information and Diagnosis: For Petrol Engine Model
7
Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “BLK” and “WHT” wire
terminals of electric throttle body assembly connector.
Is resistance infinity?
Go to Step 8.
“BLK” wire is shorted to
“WHT” wire.
8
Wire harness check
1) Turn ON ignition switch.
2) Measure voltage between “C37-54” terminal of ECM
connector and engine ground.
Is voltage 0 V?
Substitute a known-
good ECM and recheck.
“BLK” wire is shorted to
power circuit.
9
Ground circuit check
1) Turn OFF ignition switch.
2) Measure resistance between “GRN” wire terminal of
electric throttle body assembly connector and engine
ground.
Is resistance below 5
Ω
?
Go to Step 11.
Go to Step 10.
10 Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Check for proper connection of ECM connector at “C37-
41” terminal.
3) Measure resistance between “C37-41” terminal of ECM
connector and engine ground with ignition switch turned
OFF.
Is resistance below 5
Ω
?
“GRN” wire is open or
high resistance circuit.
Faulty ECM ground
circuit. If circuit is OK,
substitute a known-
good ECM and recheck.
11 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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Engine General Information and Diagnosis: For Petrol Engine Model 1A-110
DTC P0131 / P0132 / P0134: O2 Sensor (HO2S) Circuit Low Voltage / High Voltage / No Activity
Detected (Sensor-1)
S6JB0A1114032
Wiring Diagram
A/F Sensor Description
Refer to “A/F Sensor Description: For Petrol Engine Model”.
DTC Detecting Condition and Trouble Area
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
4
3
9
PNK
6
2
1
8
5
BLK/WHT
BLK
PNK
*GRN
C37-34
C37-32
C37-37
C37-38
BLK
BLK
BLU
WHT
C37-35
C37-31
WHT
BLK
RED/YEL
RED/BLU
PNK/BLU
BLK/YEL
10
7
11
5 V
5 V
I5JB0A110044-02
1. HO2 heater relay
4. “O2 HTR” fuse
7. Heater
10. Adjusting resistor (J20A engine)
2. Shield wire
5. “IG COIL” fuse
8. To HO2S-2 heater
11. Sensor
3. Ignition switch
6. A/F sensor
9. ECM
*: M16A engine
DTC detecting condition
Trouble area
DTC P0131:
A/F sensor (LF+) terminal voltage is lower than 1.8 V or A/F sensor output
current is lower than –5 mA.
(2 driving cycle detection logic)
DTC P0132:
A/F sensor (LF+) terminal voltage is higher than 3.8 V or A/F sensor output
current is more than 5 mA.
(2 driving cycle detection logic)
DTC P0134:
Impedance of A/F sensor element is higher than 500
Ω for more than 2 sec
even though A/F sensor heater is turned ON for more than 160 sec with
engine running. (A/F sensor or sensor circuit open)
(2 driving cycle detection logic)
• A/F sensor circuit
• A/F sensor
• ECM
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