Dtc P0102: Mass Air Flow Circuit Low Input - Suzuki SX4 Service Manual

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1A-66 Engine General Information and Diagnosis:

DTC P0102: Mass Air Flow Circuit Low Input

Wiring Diagram
Refer to "DTC P0101: Mass Air Flow Circuit Range / Performance".
DTC Detecting Condition and Trouble Area
Voltage of MAF sensor output is less than specified value for specified time
with engine running.
(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 troubleshooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions for DTC Troubleshooting".
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 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 "BLK/RED" 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
"GRY" wire terminal of MAF and IAT sensor connector
and engine ground.
Is resistance below 5
5
Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Measure resistance between "C01-27" terminal of ECM
connector and engine ground.
Is resistance below 5
DTC detecting condition
Action
?
?
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.
"GRY" wire is open or
high resistance circuit.
S7RW0A1104020
No
Go to "Engine and
Emission Control
System Check".
Go to Step 3.
"BLK/RED" wire is open
circuit.
Go to Step 5.
ECM grounds "C01-58",
"C01-15", "C01-30" and/
or "E01-31" circuit is
open or high resistance.
If wires are OK,
substitute a known-
good ECM and recheck.

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