4-32 FI SYSTEM DIAGNOSIS
Step 2
1) Turn the ignition switch OFF.
2) Measure the ECT sensor resistance. (Refer to page 6-10 for
details.)
% ECT sensor resistance:
Approx. 2.45 kΩ at 20 °C (68 °F) (Terminal – Terminal)
! 09900-25008: Multi circuit tester set
& Tester knob indication: Resistance (Ω)
Is the resistance OK?
2
YES
• B/Br or B/Bl wire open or shorted to ground, or
poor
X or
Z connection.
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
NO Replace the ECT sensor with a new one.
Engine Coolant Temp Resistance
20 °C (68 °F) Approx. 2.45 kΩ
40 °C (104 °F) Approx. 1.148 kΩ
60 °C (140 °F) Approx. 0.587 kΩ
80 °C (176 °F) Approx. 0.322 kΩ
ECM coupler
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