Suzuki Swift Sport 2004 Service & Repair Manual page 123

Step
1 Was "Engine and Emission Control System Check"
performed?
2 IAT sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch.
3) Check intake air temp. displayed on scan tool.
° °
Is 119 C (246 F) indicated?
3 ECM voltage check
1) Disconnect connector from MAF and IAT sensor with
ignition switch turned OFF.
2) Check for proper connection to MAF and IAT sensor at
"BLK/YEL" and "GRY/BLU" wire terminals.
3) If OK, then turn ON ignition switch, measure voltage
between "BLK/YEL" wire terminal of MAF and IAT
sensor connector (1) and vehicle body ground.
Is voltage about 4 – 6 V?
4 IAT short circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "BLK/YEL" wire terminal of
MAF and IAT sensor connector and vehicle body
ground.
Is resistance infinity?
5 IAT short circuit check
1) Turn ON ignition switch.
2) Measure voltage between "BLK/YEL" wire terminal of
MAF and IAT sensor connector and vehicle body
ground.
Is voltage about 0 V?
6 IAT sensor for performance check
1) Check IAT sensor according to "MAF and IAT Sensor
Inspection in Section 1C".
Is it in good condition?
Action
I4RS0B110020-01
Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 3.
Go to Step 6.
Go to Step 5.
Go to Step 6.
Substitute a known-
good ECM and recheck.
1A-73
No
Go to "Engine and
Emission Control
System Check".
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
Go to Step 4.
"BLK/YEL" wire is
shorted to ground
circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
"BLK/YEL" wire is
shorted to other circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
Replace MAF and IAT
sensor.