Black Widow Security BW 2800 Service Manual download pdf (Page 52)

53

8/14/02

53

COOLANT SENSOR

Fault Reported Possible Cause Action

Engine temp sensor high fault

Engine temp sensor hi fault

Damaged coolant temper-

ature sensor, ECU, harness

short or open circuit, sensor

connector disconnected or

damaged

Component test the coolant temperature

sensor. Refer to "Coolant Sensor" starting

on page 53.

Check that sensor harness connector is

secure.

Disconnect ECU and go to Test 1.

Pinpoint Tests

Test Result Action

1. Check wire and terminal

integrity:

- P1 B2

- P1 E4

OK Go to Test 2.

Faulty

Locate and correct wiring fault and go to

Test 7.

2. Check resistance value:

- P1 B2 to P1 E4

(verify value at temperature

tested; see table)

OK

Disconnect temperature sensor and go to

Test 6.

Open circuit Go to Test 3.

Short circuit

Disconnect temperature sensor and go to

Test 4.

3. Check wire continuity:

- P1 B2 to CN4 pin 2

- P1 E4 to CN4 pin 1

OK Go to Test 5.

Open circuit

Locate and correct wiring fault and go to

Test 7.

4. Check for wire short circuit:

- P1 B2 to P1 E4

OK Go to Test 5.

Short circuit

Locate and correct wiring fault and go to

Test 7.

5. Check sensor resistance:

- CN4 pin 1 to pin 2

(verify value at temperature

tested; see table)

OK Go to Test 7.

Faulty Replace sensor, go to Test 7.

6. Check wire for short circuit”

- P1 B2 to ground

OK Go to Test 7.

Short circuit

Locate and correct wiring fault and go to

Test 7.

7. Reconnect harness, run

engine and check for presence

of fault.

OK Done

Fault still present Contact Cannondale Dealer Service.

Circuit Diagram

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