Honda BF135A Manual page 238

3. ECT sensor 2 ground line short circuit check
-1. Turn the ignition switch OFF. Disconnect the ECT sen-
sor 2 connector and the ECM connector B.
-2. Check for the continuity between the No. 2 (Red/
Black) terminal of the ECT sensor 2 harness side 2P
connector and the body ground.
ECT SENSOR 2 HARNESS SIDE
2P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
Is there the continuity?
YES – Repair short in the wire between the ECT
sensor 2 and the engine ground.
NO – Perform "4. ECT sensor 2 ground line open
circuit check".
4. ECT sensor 2 ground line open circuit check
-1. Reset the ECM connector B.
-2. Check for the continuity between the No. 1 (Green/
Red) terminal of the ECT sensor 2 harness side 2P
connector and the body ground.
ECT SENSOR 2 HARNESS SIDE
2P CONNECTOR
SG2 (GREEN/RED)
VIEWED FROM THE TERMINAL SIDE
Is there the continuity?
YES – Perform "5. ECT sensor 2 check".
NO – Repair open in the wire between the ECT
sensor 2 and the engine ground.
5-85
TOH1 (RED/BLACK)
5. ECT sensor 2 check
-1. Turn the ignition switch OFF and disconnect the 2P
connector of the ECT sensor 2 .
-2. Measure the resistance between the No. 1 and the No.
2 terminals of the ECT sensor 2 side 2P connector.
ECT SENSOR 2 SIDE
2P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
ENGINE COOLANT TEMPERATURE
Is there the resistance corresponding to the engine
coolant temperature?
YES – Substitute a known-good ECM and recheck.
NO – Replace the ECT sensor 2.
BF135A•BF150A