Dtc P0102: Mass Air Flow Circuit Low Input - Suzuki Grand Vitara 2011 Manual

1A-83 Engine General Information and Diagnosis: For Petrol Engine Model

DTC P0102: Mass Air Flow Circuit Low Input

Wiring Diagram
Refer to "DTC P0101: Mass Air Flow Circuit Range / Performance: For Petrol Engine Model".
DTC Detecting Condition and Trouble Area
DTC detecting condition
Voltage of MAF sensor output is less than 0.15 V for 0.5
sec continuously.
(1 driving cycle detection logic)
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".
Step
1 Was "Engine and Emission Control System Check"
performed?
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?
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?
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
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
Action
Ω
?
Ω
?
Trouble area
• Open or short in MAF sensor circuit
• MAF sensor
• ECM
Yes
Go to Step 2.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
Go to Step 4.
Go to Step 6.
"BLU" wire is open or
high resistance circuit.
S6JB0A1114019
No
Go to "Engine and
Emission Control
System Check: For
Petrol Engine Model".
Go to Step 3.
"BLU/BLK" wire is open
circuit.
Go to Step 5.
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.