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
