51
8/14/02
51
AIR TEMPERATURE SENSOR
Fault
Possible Cause
Action
Air temp sensor high fault
Air temp sensor low fault
Damaged air temperature
sensor, ECU, harness short or
o p e n c i r c u i t , s e n s o r c o n -
n e c t o r d i s c o n n e c t e d o r
damaged
Component test the air temperature
sensor.
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 D1
- P1 E4
OK
Disconnect TPS sensor and go to Test 2.
Faulty
Locate and correct wiring fault and go to
Test 7.
2. Check resistance value:
- P1 D1 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 D1 to CN5 pin 2
- P1 E4 to CN5 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 D1 to P1 E4
OK
Go to Test 5.
Short circuit
Locate and correct wiring fault and go to
Test 7.
5. Check sensor resistance:
- CN5 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 D1 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.
