Open Air Temperature Sensor Inspection; High Coolant Temperature Indicator/Ect Sensor Inspection - Honda CRF1000 Shop Manual

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LIGHTS/METERS/SWITCHES
INSPECTION
Remove the open air temperature sensor 2P (Black)
connector (page 22-17).
Measure the resistance at the 2P connector [1] of the
sensor side.
Standard: 4.9 – 5.1 kΩ (25°C/77°F)
Replace the open air temperature sensor if it is out of
specification.
HIGH COOLANT TEMPERATURE
INDICATOR/ECT SENSOR
SYSTEM INSPECTION
If the high coolant temperature indicator does not
operate properly, check the following:
– Combination meter initial operation (page 22-12)
– TXD line (page 22-14)
– MIL blinking: If the MIL blinks 7 (DTC 7-1, 7-2),
check the ECT sensor system (page 4-14).
– ECT sensor (page 22-18)
If the above items are OK, replace the combination
meter (page 22-12).
ECT SENSOR UNIT INSPECTION
Remove the ECT sensor (page 4-41).
Suspend the ECT sensor [1] in a pan of coolant on an
electric heating element and measure the resistance
through the sensor 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 or
ECT sensor touch the pan.
Measure the resistance between the ECT sensor
terminals.
Temperature
Resistance
Replace the ECT sensor if it is out of specification.
22-18
40°C (104°F) 100°C (212°F)
1.0 – 1.3 kΩ 0.14 – 0.18 kΩ
[1]
[1]