Suzuki TU250X Service Manual page 169

4-48 FI SYSTEM DIAGNOSIS
Step 2
1) Turn the ignition switch OFF.
2) Disconnect the IAT sensor coupler.
3) Measure the IAT sensor resistance.
 IAT sensor resistance: Approx. 2.45 kΩ at 20 °C (68 °F)
 09900-25008: Multi circuit tester set
 Tester knob indication: Resistance (Ω)
Is the resistance OK?
• Y/R or B/Br wire open or shorted to ground, or
poor 5 or T connection
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
YES
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO Replace the IAT sensor with a new one.
 IAT sensor specification
Intake Air Temp
20 °C (68 °F)
80 °C (140 °F)
NOTE:
IAT sensor resistance measurement method is the same way as
that of the ET sensor. Refer to page 4-70 for details.
(Terminal – Terminal)
Resistance
Approx. 2.45 kΩ
Approx. 0.32 kΩ
2
2
ECM coupler (Harness side)