Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 34
1A-83 Engine General Information and Diagnosis: For Petrol Engine Model
DTC P0102: Mass Air Flow Circuit Low Input
S6JB0A1114019
Wiring Diagram
Refer to “DTC P0101: Mass Air Flow Circuit Range / Performance: For Petrol Engine Model”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and run it for 10 sec.
4) Check DTC and pending 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
Voltage of MAF sensor output is less than 0.15 V for 0.5
sec continuously.
(1 driving cycle detection logic)
• Open or short in MAF sensor circuit
• MAF sensor
• 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
MAF sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Start engine and check MAF value displayed on scan
tool. (Refer to “Scan Tool Data: For Petrol Engine Model”
for normal value.)
Is normal value indicated?
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
Go to Step 3.
3
MAF sensor power supply voltage check
1) Disconnect connector from MAF and IAT sensor with
ignition switch turned OFF.
2) Turn ON ignition switch, measure voltage between
engine ground and “BLU/BLK” wire terminal of MAF and
IAT sensor connector.
Is voltage 10 – 14 V?
Go to Step 4.
“BLU/BLK” wire is open
circuit.
4
MAF sensor ground circuit check
1) Turn OFF ignition switch, measure resistance between
“BLU” wire terminal of MAF and IAT sensor connector
and engine ground.
Is resistance below 3
Ω
?
Go to Step 6.
Go to Step 5.
5
Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Measure resistance between “C37-27” terminal of ECM
connector and engine ground.
Is resistance below 3
Ω
?
“BLU” wire is open or
high resistance circuit.
ECM grounds “C37-58”,
“C37-48”, “C37-30”,
“C37-29” and/or “C37-
15” circuit is open or
high resistance.
If wires are OK,
substitute a known-
good ECM and recheck.
Engine General Information and Diagnosis: For Petrol Engine Model 1A-84
DTC P0103: Mass Air Flow Circuit High Input
S6JB0A1114020
Wiring Diagram
Refer to “DTC P0101: Mass Air Flow Circuit Range / Performance: For Petrol Engine Model”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and run it for 10 sec.
4) Check DTC and pending DTC.
6
MAF sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure voltage between “RED” wire terminal of MAF
and IAT sensor connector and engine ground with
ignition switch turned ON.
Is voltage 0 V?
Go to Step 7.
“RED” wire is shorted to
other circuit.
7
MAF sensor signal circuit check
1) Measure resistance between “RED” wire terminal of
MAF and IAT sensor connector and engine ground with
ignition switch turned OFF.
Is resistance infinity?
Go to Step 8.
“RED” wire is shorted to
ground circuit.
8
MAF sensor signal circuit check
1) Measure resistance between “RED” wire terminal of
MAF and IAT sensor connector and “C37-26” terminal of
ECM connector.
Is resistance below 3
Ω
?
Go to Step 9.
“RED” wire is open or
high resistance circuit.
9
MAF sensor output signal check
1) Connect connectors to MAF and IAT sensor and ECM
with ignition switch turned OFF.
2) Measure voltage between “C37-26” and “C37-27”
terminals of ECM connector referring to “Mass Air Flow
(MAF) and Intake Air Temperature (IAT) Sensor On-
Vehicle Inspection: For Petrol Engine Model in Section
1C”.
Is each value within specified range?
Substitute a known-
good ECM and recheck.
Faulty MAF and IAT
sensor.
Step
Action
Yes
No
DTC detecting condition
Trouble area
Voltage of MAF sensor output is more than 5 V for 0.5 sec continuously.
(1 driving cycle detection logic)
• Open or short in MAF sensor circuit
• MAF sensor
• ECM
1A-85 Engine General Information and Diagnosis: For Petrol Engine Model
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
MAF sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Start engine and check MAF value displayed on scan
tool. (Refer to “Scan Tool Data: For Petrol Engine Model”
for normal value.)
Is normal value indicated?
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
Go to Step 3.
3
MAF sensor power supply voltage check
1) Disconnect connector from MAF and IAT sensor with
ignition switch tuned OFF.
2) Turn ON ignition switch, measure voltage between
engine ground and “BLU/BLK” wire terminal of MAF and
IAT sensor connector.
Is voltage 10 – 14 V?
Go to Step 4.
“BLU/BLK” wire is open
circuit.
4
MAF sensor ground circuit check
1) Turn OFF ignition switch, measure resistance between
“BLU” wire terminal of MAF and IAT sensor connector
and engine ground.
Is resistance below 5
Ω
?
Go to Step 6.
Go to Step 5.
5
Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Measure resistance between “C37-27” terminal of ECM
connector and engine ground.
Is resistance below 5
Ω
?
“BLU” wire is open or
high resistance circuit.
ECM grounds “C37-58”,
“C37-48”, “C37-30”,
“C37-29” and/or “C37-
15” circuit are open or
high resistance.
If wires are OK,
substitute a known-
good ECM and recheck.
6
MAF sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure voltage between “RED” wire terminal of MAF
and IAT sensor connector and engine ground.
Is voltage 0 V?
Go to Step 7.
“RED” wire is shorted to
other circuit.
7
MAF sensor output signal check
1) Connect connector to MAF and IAT sensor and ECM
with ignition switch turned OFF.
2) Measure voltage between “C37-26” and “C37-27”
terminal of ECM connector referring to “Mass Air Flow
(MAF) and Intake Air Temperature (IAT) Sensor On-
Vehicle Inspection: For Petrol Engine Model in Section
1C”.
Is each value within specified range?
Substitute a known-
good ECM and recheck.
Faulty MAF and IAT
sensor.
Engine General Information and Diagnosis: For Petrol Engine Model 1A-86
DTC P0106: Manifold Absolute Pressure Range / Performance
S6JB0A1114021
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
NOTE
Check to make sure that the following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• Intake air temperature at engine start: –10
°C (14 °F) to 80 °C (176 °F)
• Intake air temperature: –10
°C (14 °F) to 70 °C (158 °F)
• Engine coolant temperature: 70
°C (158 °F) to 150 °C (302 °F)
• Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC using scan tool and warm up engine completely.
3) Run engine at idle speed for 1 min.
4) Check DTC and pending DTC.
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
1
2
3
GRY/RED
GRY/RED
5V
5V
C37-14
C37-55
C37-57
RED/WHT
GRY/GRN
GRY/GRN
C37-15
C37-29
C37-48
BLK/ORN
C37-58
C37-30 BLK/ORN
BLK/YEL
BLK/YEL
BLK/YEL
I5JB0A110034-01
1. Manifold absolute pressure sensor
3. To other sensors
2. To electric load current sensor (for J20 engine) and A/C refrigerant pressure
sensor (if equipped with A/C)
4. ECM
DTC detecting condition
Trouble area
• Difference between Max. manifold absolute pressure
value and Min. manifold pressure value is less than 1.3
kPa (0.19 psi) when engine running at idle speed.
or
• Difference between barometric pressure value and
manifold pressure value is less than 33.3 kPa (4.83 psi)
for 5 sec. at 2000 r/min. or more.
(2 driving cycle detection logic)
• Manifold absolute pressure sensor
• Manifold absolute pressure sensor vacuum passage
• Air intake system
• ECM
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