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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:
Approx. 2.45 kΩ at 20 °C (68 °F)
(Terminal – Terminal)
09900-25008: Multi-circuit tester set
Tester knob indication: Resistance (Ω)
Refer to page 7-7 for details.
Is the resistance OK?
4) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
ECT sensor specification
YES
• 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.
• 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.
Engine Coolant Temp Resistance
20 °C (68 °F) Approx. 2.45 kΩ
50 °C (122 °F) Approx. 0.811 kΩ
80 °C (176 °F) Approx. 0.318 kΩ
110 °C (230 °F) Approx. 0.142 kΩ
2
2
(Black) (Gray)
ECM couplers (Harness side)