1A-51 Engine General Information and Diagnosis:
3 1) Turn the ignition switch OFF.
2) Connect the ECM coupler.
3) Remove the regulator/rectifier. Refer to “Regulator /
Rectifier Inspection in Section 1J (Page 1J-8)”.
4) Disconnect the ECT sensor coupler.
5) Measure the ECT sensor resistance.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Resistance (Ω)
ECT sensor resistance
Approx. 2.45 kΩ at 20 °C (68 °F)
(Terminal – Terminal)
NOTE
Refer to “ECT Sensor Inspection in Section 1C
(Page 1C-3)” for details.
Is the resistance OK?
• B/Bl or B/Br wire
open or shorted to
the ground, or poor
“10” or “29”
connection.
• If wire and
connection are OK,
intermittent trouble 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. Refer to “ECM
Removal and
Installation in Section
1C (Page 1C-1)”.
Replace the ECT
sensor with a new one.
Refer to “ECT Sensor
Removal and
Installation in Section
1C (Page 1C-2)”.
Step Action Yes No
(A)
I718H1110178-03
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