Honda CBR650 - Service manual > High coolant temperature indicator/ECT sensor, engine oil pressure indicator/EOP switch

High coolant temperature indicator/ECT sensor

SYSTEM INSPECTION

NOTE:

• If the high coolant temperature indicator and digital display do not function at all, refer to combination meter initial operation check.

If the high coolant temperature indicator does not operate properly, check the following:

• MIL blinking: If the blinks 7 (DTC 7-1, 7-2), check the ECT sensor system
• Combination meter indication when the serial communication line is abnormal
• ECT sensor

If the above items are OK, replace the combination meter.

• CBR650F/FA
• CB650F/FA

ECT SENSOR INSPECTION

Remove the ECT sensor.

Suspend the ECT sensor [1] in a pan of coolant (1:1 antifreeze and distilled water mixture) on an electric heating element and measure the resistance between the sensor terminals as the coolant heats up.

• Soak the ECT sensor in coolant up to its threads with at least 40 mm (1.6 in) from the bottom of the pan to the bottom of the sensor.
• Keep the temperature constant for 3 minutes before testing. A sudden change of temperature will result in incorrect readings. Do not let the thermometer [2] or ECT sensor touch the pan.

Replace the ECT sensor if it is out of specification by more than 10% at any temperature listed.

Install the ECT sensor.

Engine oil pressure indicator/EOP switch

SYSTEM INSPECTION

When the system is normal, the engine oil pressure indicator [1] comes on when the ignition switch is turned ON with the engine stop switch " ", and then goes off when the engine is started.

NOTE:

• If the oil pressure indicator and digital display do not function at all, refer to combination meter initial operation check.

If the engine oil pressure indicator comes on for about 2 seconds and goes off when the ignition switch is turned ON, check the EOP switch line for open circuit.

If the engine oil pressure indicator stays on after the engine is started, stop the engine immediately and confirm the indication conditions:

• The engine oil pressure indicator stays on and the other indications function normally, check the following:
  • Engine oil level
  • EOP switch line for short circuit
  • Engine oil pressure

If the above items are OK, replace the combination meter.

• CBR650F/FA
• CB650F/FA

EOP SWITCH LINE INSPECTION

Turn the ignition switch OFF.

Disconnect the EOP switch wire.

Open Circuit Inspection

Check for continuity between the wire terminal [1] and ground.

There should be continuity.

• If there is no continuity, the EOP switch wire (Black or Light green) has a open circuit.
• If there is continuity, replace the EOP switch.

Short Circuit Inspection

Disconnect the combination meter 16P (Gray) connector.

• CBR650F/FA
• CB650F/FA

Check for continuity between the wire terminal and ground as same manner as above.

There should be no continuity.

• If there is continuity, the EOP switch wire (Black or Light green) has a short circuit.
• If there is no continuity, replace the EOP switch.

EOP SWITCH REMOVAL/ INSTALLATION

Remove the under cowl (CBR650F/FA only).

Place the motorcycle on its sidestand on a level surface.

Release the rubber cap [1].

Remove the terminal screw [2] and disconnect the switch wire [3].

Remove the EOP switch [4].

Installation is in the reverse order of removal.

NOTE:

• Before installing the EOP switch, clean the threads in the crankcase with a degreasing agent thoroughly.
• Apply sealant (TB1207B manufactured by ThreeBond or an equivalent)　to the EOP switch threads. Do not apply to the sensor tip in the area as shown.

TORQUE:
 EOP switch:
  12 N*m (1.2 kgf*m, 9 lbf*ft)
 EOP switch terminal screw:
  2.0 N*m (0.2 kgf*m, 1.5 lbf*ft)

Check the engine oil level.

See also: