Suzuki GSX-R750 Service Manual page 208

4-52 FI SYSTEM DIAGNOSIS
Step 2
1) Turn the ignition switch OFF.
2) Disconnect the ECT sensor coupler.
3) Measure the ECT sensor resistance.
 ECT sensor resistance:
 09900-25008: Multi-circuit tester set
 Tester knob indication: Resistance (Ω)
Refer to page 7-7 for details.
Is the resistance OK?
• B/Bl or B/Br wire open or shorted to ground, or
poor 0 or S 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 ECT sensor with a new one.

When using the multi-circuit tester, do not storongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
4) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
 ECT sensor specification
Engine Coolant Temp
20 °C (68 °F)
50 °C (122 °F)
80 °C (176 °F)
110 °C (230 °F)
Approx. 2.45 kΩ at 20 °C (68 °F)
(Terminal – Terminal)
Resistance
Approx. 2.45 kΩ
Approx. 0.811 kΩ
Approx. 0.318 kΩ
Approx. 0.142 kΩ
2
2
ECM couplers (Harness side)
(Black) (Gray)