Suzuki SX4 Service Manual page 115

Step
5 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 (2) of MAF
and IAT sensor connector (1).
Is voltage 10 – 14 V?
6 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
7 Ground circuit check
1) Measure resistance between "C01-27" terminal of ECM
connector and vehicle body ground.
Is resistance below 5
8 MAF sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Turn ON ignition switch, measure voltage between
"GRN/BLK" wire terminal of MAF and IAT sensor
connector and engine ground.
Is voltage 0 V?
9 MAF sensor signal circuit check
1) Turn OFF ignition switch, measure resistance between
"GRN/BLK" wire terminal of MAF and IAT sensor
connector and engine ground.
Is resistance infinity?
10 MAF sensor signal circuit check
1) Measure resistance between "GRN/BLK" wire terminal
of MAF and IAT sensor connector and "C01-26" terminal
of ECM connector.
Is resistance below 3
11 Is DTC P0106 displayed?
Action
Ω
?
Ω
?
Ω
?
Engine General Information and Diagnosis:
Yes
Go to Step 6.
I4RS0A110020-01
Go to Step 8.
"GRY" wire is open or
high resistance circuit.
Go to Step 9.
Go to Step 10.
Faulty MAF and IAT
sensor.
Go to "DTC P0106:
Manifold Absolute
Pressure Range /
Performance".
1A-65
No
"BLK/RED" wire is open
circuit.
Go to Step 7.
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.
"GRN/BLK" wire is
shorted to others circuit.
"GRN/BLK" wire is
shorted to ground
circuit.
"GRN/BLK" wire is open
or high resistance
circuit.
Substitute a known-
good ECM and recheck.