Suzuki Ignis Service Manual page 3270

Step
5 Check MAF sensor power supply voltage.
1) Disconnect connector from MAF sensor with ignition
switch turned OFF.
2) Turn ON ignition switch, measure voltage between engine
ground and "BLK/RED" wire terminal of MAF sensor con-
nector. See Fig. 1.
Is voltage 10 – 14 V?
6 Check MAF sensor ground circuit.
1) Measure resistance between "ORN" wire terminal of MAF
sensor connector and engine ground.
Is resistance below 5Ω?
7 Check ground circuit.
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Remove ECM from vehicle body and connect connectors
to ECM.
3) Measure resistance between "C63-28" wire terminal of
ECM connector and vehicle body ground.
Is resistance below 5 Ω?
8 Check MAF sensor signal circuit.
1) Turn ON ignition switch.
2) Measure voltage between "PNK/BLK" wire terminal of MAF
sensor connector and engine ground.
Is voltage 0 V?
9 Check MAF sensor signal circuit.
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "PNK/BLK" wire terminal of
MAF sensor connector and vehicle body ground.
Is resistance infinity?
10 Check MAF sensor signal circuit.
1) Measure resistance between "PNK/BLK" wire terminal of
MAF sensor connector and "C63-14" wire terminal of ECM
connector.
Is resistance below 3 Ω?
11 Is DTC P0121 detected?
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-69
Yes
Go to Step 6.
Go to Step 8.
"ORN" wire in
open or high resis-
tance circuit.
Go to Step 9.
Go to Step 10.
Faulty MAF sen-
sor.
Go to "DTC P0121
Throttle Position
Sensor Circuit
Range / Perfor-
mance" in this sec-
tion.
No
"BLK/RED" wire in
open circuit.
Go to Step 7.
ECM grounds
"C63-1", "C64-1"
and/or "C64-2" cir-
cuit in open or high
resistance.
If wires are OK,
substitute a
known-good ECM
and recheck.
"PNK/BLK" wire
shorted to others
circuit.
"PNK/BLK" wire
shorted to ground
circuit.
"PNK/BLK" wire in
open or high resis-
tance circuit.
Substitute a
known-good ECM
and recheck.