Black Widow Security BW 2800 Service Manual download pdf (Page 11)

Electrical_EFI Service Manual.fm

COOLANT TEMPERATURE SENSOR

The coolant temperature sensor is brown in color

and located on the front of the engine cylinder head.

It is an NTC thermistor.

The ECU measures the current flow through this

thermistor to ground and uses it to determine the

engine coolant temperature. The ECU calculates

fueling to optimize engine performance at all temper-

atures. It also calculates hot and cold start fueling

requirements.

The sensor resistance decreases as the temper-

ature increases.

Dynamic Test - ECU Monitor

1. Starting with a completely cool engine, use the

ECU Monitor window of the Cannondale

Diagnostic and Maintenance Tool to read the

Engine Temperature (degC) field in the ECU

Monitor window. Refer to "Using the ECU

Monitor" starting on page 39.

2. Open the radiator cap and test the coolant tem-

perature with a thermometer.

3. Compare the values. If the two values do not cor-

respond closely, the sensor may be damaged. Go

to the next step.

4. Be sure to replace the radiator cap and start the

engine and allow to reach operating temperature

(60°C). Observe the Engine Temperature (degC)

field in the ECU Monitor window. If the value does

not increase as the engine warms, go to the next

test.

Static Test - Resistance

1. Disconnect the sensor harness connector.

2. Use an Ohmmeter to measure the sensor resis-

tance between terminals 1 and 2. Refer to "Cool-

ant Sensor Resistance Range" starting on

page 54. If measured resistance is inconsistent at

the tested temperature replace the sensor. If the

sensor is OK, the sensor harness wiring or the

ECU itself may be damaged. Take corrective

action.

AIR TEMPERATURE SENSOR

The intake air temperature sensor is attached to the

airbox with the tip mounted inside the airbox.

It is a NTC thermistor and green in color.

Resistance will drop as temperature rises.

The sensor tip is very sensitive to temperature

change.

CAUTION:

The tip can be damaged easily; use extra care

when installing or working inside the airbox.

The ECU uses the information from this sensor to

calculate the fuel necessary for a given air temper-

ature.

Dynamic Test - ECU Monitor

1. Use the ECU Monitor window of the Cannondale

Diagnostic and Maintenance Tool to read the

Engine Temperature (degC) field in the ECU

Monitor window. Refer to "Using the ECU

Monitor" starting on page 39.

1. Coolant temperature sensor (ATV shown)

WARNIN

Never open the coolant system when the

engine is hot. Coolant is hot and under

high pressure. It can spray out forcefully

and burn or scald you severely.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 59 60

Comments to this Manuals

No comments

Black Widow Security BW 2800 Service Manual Page 11

Comments to this Manuals

Related products and manuals for Security access control systems Black Widow Security BW 2800