Eop Switch (High Pressure Side); Troubleshooting - Honda BF135A Manual

5. ECT sensor 3 check
-1. Turn the ignition switch OFF and disconnect the ECT
sensor 3 2P connector.
-2. Measure the resistance between the No.1 and No.2
terminals of the ECT sensor 3 side 2P connector.
ECT SENSOR 3 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 3.
5-87

• EOP switch (High Pressure Side)

Troubleshooting

MIL blinks 26 times
1. Symptom reproduction test
-1. Reset the ECM.
-2. Turn the ignition switch OFF and connect the test har-
ness.
• Hold the sensor connector connected.
-3. Turn the ignition switch ON.
-4. Measure the voltage between the test harness A-17
terminal (+) and A-2 terminal (–).
A-2
Is the voltage 0V (OFF signal)?
YES – Temporary failure (Disappeared)
NO – Perform "2. EOP switch signal line open cir-
cuit check".
2. EOP switch signal line open circuit check
-1. Turn the ignition switch OFF and disconnect the EOP
switch 2P connector.
-2. Turn the ignition switch ON. Measure the voltage
between the No.1 (Yellow/Red) terminal of the EOP
switch harness side 2P connector and the body
ground.
EOP SWITCH HARNESS SIDE 2P
CONNECTOR
VIEWED FROM THE TERMINAL SIDE
Is there the battery voltage?
YES – Perform "3. EOP switch signal line short circuit
check".
NO – Repair open in the wire between the EOP
switch and the ECM.
BF135A•BF150A
A-17
OPSH (YELLOW/RED)