HONDA marine BF135A, Руководство по ремонту, Страница: 47 / 49

5-44
5. EOP switch check
-1. Turn the ignition switch OFF and connect all the con-
nectors.
-2. Turn the ignition switch ON and check the EOP
switch using the Dr. H.
Does the tester shows the switch OFF?
YES – If the DTC appears again, substitute a
known-good ECM and recheck.
NO – Replace the EOP switch.
• ECT Sensor 4 Troubleshooting
DTC 143-1: ECT sensor 4 voltage is low
1. Symptom reproduction test
-1. Connect the Dr. H and clear the DTC once. If the
DTC can not be cleared, go on the troubleshooting.
-2. Turn the ignition switch ON.
-3. Measure the ECT sensor 4 voltage using the Dr. H.
Is the measured voltage 0.08 – 4.99V?
YES – Temporary failure (Disappeared)
NO – Perform “2. ECT sensor 4 signal line short
circuit check”.
2. ECT sensor 4 signal line short circuit check
-1. Turn the ignition switch OFF. Disconnect the ECT
sensor 4 connector and the ECM connector B.
-2. Check for the continuity between the No. 2
(Red/Green) terminal of the ECT sensor 4 harness
side connector and the body ground.
Is there the continuity?
YES – Repair short in the wire between the ECT
sensor 4 and the ECM.
NO – Perform “3. ECT sensor 4 check”.
3. ECT sensor 4 check
-1. Turn the ignition switch OFF and connect the ECT
sensor 4 2P connector.
-2. Turn the ignition switch ON. Measure the ECT sen-
sor 4 temperature using the Dr. H.
Does the measurement correspond to the engine
coolant temperature?
YES – If the DTC appears again, substitute a
known-good ECM and recheck.
NO – Replace the ECT sensor 4.
ECT SENSOR 4 HARNESS
SIDE 2P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
TOH3
(RED/GREEN)