Suzuki Baleno Manual page 1697

CODE NO.25 IAT SENSOR (INTAKE AIR TEMPERATURE SENSOR) CIRCUIT
(HIGH TEMPERATURE INDICATED, SIGNAL VOLTAGE LOW)
Disconnect IAT sensor coupler with ignition switch OFF.
With ignition switch ON, is voltage applied to "Gr/R" wire
terminal of IAT sensor coupler 4V or more?
Check IAT sensor referring "IAT SENSOR" in this
section.
Is it in good condition?
Intermittent trouble or faulty ECM (PCM).
Recheck referring to "INTERMITTENT AND POOR
CONNECTION" in Section 0A.
NOTE:
Upon completion of inspection and repair work, perform final check, referring to "FINAL CHECK" in this section to
confirm that the trouble has been corrected.
ELECTRONIC FUEL INJECTION SYSTEM (G13/G16 ENGINE WITHOUT WU TWC) 6E1-33
YES
YES
1. ECM (PCM)
2. ECM (PCM) coupler
3. IAT sensor
4. IAT sensor coupler
5. To other sensor
NO
"Gr/R" wire shorted to ground circuit.
If wire is OK, substitute a known-good ECM (PCM)
and recheck.
NO
Faulty IAT sensor.
1. ECT sensor coupler
disconnected
2. Engine ground