Question about 1997 Ford Taurus

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97 model can the ECT sensor cause starting

97 model can the ECT sensor cause starting failure

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  • p_perletti Mar 20, 2009

    replaced engine coolant temperature sensor ( the one related to the pcm) as advised by the book (ford taurus and mercury sable) and the problem disappeared.... i think is just concidence ... regards

  • Mike Butler
    Mike Butler May 11, 2010

    There are quite a few things that may cause a vehicle not to start. Lets go to the beginning, what exactly is the problem & when did problem start, and what have you tried so far? Have you confirmed whether it is getting spark & fuel?

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Yes! and sometime it will prevent the car from starting

Posted on Mar 13, 2009

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2002 odyssey will not shift and will only go 25mph. Flashing codes p0118, p0740, p0730, p1740


p07xx codes are transmission failures, the FSM covers that
the A/T tranny is complex.
when a DTC sets, that means , TO DO MORE TEST to find the Cause. the ECU can not guess, what is wrong,.ever.
it can only report tests that fail, called, "monitors" OBD2 jargon.
see the great review here (he knows his fact !)
http://honda-tech.com/showthread.php?t=1490107
see the 10 tests above link. (fsm tests, they are)
mindless tests. no tech needs this. its just a 2 wire sensor.
if fact a thermistor. NTC type. that is all we need and the trip points.

lets review them all, (really, get the FSM and read it) or alldata.com
0118, ECT reads wrong. engine coolant temp sensor .
with all sensors, its means:
P0118 ECT Circuit High Input
this will cause Limphome , so must be fixed first !!! low engine power.
the key word there is HIGH, (too high temp, too high voltage or current) the FSM tells which it is. Voltage, (odd huh? but is true)
on my car this means Open failure, over 10.4vdc is a hard fail.
causes:
  • ECT ground wire open
  • ECT hot wire open.
  • ECT bad, inside its going OPEN circuit.
  • its not too hot, as hot is lower voltage !
  • its reading insane too cold, that is, colder than possible.
  • someone disconncected this sensor with key on. so, reset it.
  • Bad ECU, (nah) or wires to ECT , as always, wires can be it.
  • the 10 tests above link. (fsm tests they are)
  • A short frorm system 12v to the ECT hot wire,
make sure dead cold , rad cap off, the rad if FULL of AF? 50%
is it> that means the ECT is under water.
no ECT works right, dry, nor engine. so check the water first.
no EFI system works right with a Crazy ECT, non do.
so is FIRST ORDER FAILURE.
with cold engine, you off the ECT connector (lock lever !) then
see about 3000 ohms, (see table in FSM)
then put back conn
get engine fully hot.
now off the ECT connector. again.
now reads 300 ohms. (about)
see the ohm change there, 10 for 1.?
300 ohms is about 200 F, see FSM charts for you ambient temp cold.
i never try to guess that. here.
if you connect any scan tool to the OBD2 port you can what
live data from the ECT till the cows come home.
why not do that. see it mess up.
the check the ECT volts key on, and ohms key off.
bingo, the problem is found.

the ECU will not lie to you, it will tell you that is measured.
either a valid temperatures or out of legal range.
in fact the ECU is just a voltmeter, that scales the volts to temperature.
we call this the ECT catastrophic monitor. (out of range)



------------------------------------------------------------------------------------
fix above first.
2 p0740
No other A/T trouble codes set, engine running at cruise speed with VSS inputs received, and the PCM detected the lockup clutch did not engage or disengage correctly.
3 P730
same as above
4: P1740 (factory code, for same as above 740)
i will not attempt to repeat the 200 pages in the FSM on transmission.
you can read it any time. at alldata.com or buy the FSM.

Feb 25, 2014 | Honda Odyssey Cars & Trucks

1 Answer

Coolant temp sensor head ect


most cars its very close to the thermostat, in fact below it.
it has more then 1 pin.
use any scan tool to see the output of the ECT
if last night was say 40f, then in the morning the ECT reads 40f
(just key ,no start you can read it ,hood closed.)
then start engine, and let it warm up 100% (drive 10miles works best) then it must read 180F or more. and HOLD there all times running.. if not ?you have cooling system failure.


Oct 13, 2013 | 2007 Suzuki Forenza Sedan

1 Answer

2002 chevy tahoa 5.3 codes p0171 0174


Trouble Code: P0171

Fuel Trim System Lean (Bank 1)

Possible Causes:


Air leaks in intake manifold, exhaust pipes or exhaust manifoldFuel control sensor is out of calibration (ECT, IAT or MAF)Low fuel pressure (fuel filter clogged, pressure regulator failure)One or more injectors restricted or pressure regulator has failedHO2S element is contaminated, deteriorated or has failedVacuum hose is disconnected, broken, leaking or loose.Trouble Code: P0174

Fuel Trim System Lean (Bank 2)

Possible Causes:


Air leaks in intake manifold, exhaust pipes or exhaust manifoldFuel control sensor is out of calibration (ECT, IAT or MAF)Low fuel pressure (fuel filter clogged, pressure regulator failure)One or more injectors restricted or pressure regulator has failedHO2S element is contaminated, deteriorated or has failedVacuum hose is disconnected, broken, leaking or loose.

Dec 27, 2012 | Cars & Trucks

1 Answer

P1114 vw passat


DTC P1114Circuit Description

The engine coolant temperature (ECT) sensor is a variable resistor, that measures the temperature of the engine coolant. The powertrain control module (PCM) supplies 5 volts to the ECT signal circuit and a ground for the ECT low reference circuit. When the ECT is cold, the sensor resistance is high. When the ECT increases, the sensor resistance lowers. With high sensor resistance, the PCM detects a high voltage on the ECT signal circuit. With lower sensor resistance, the PCM detects a lower voltage on the ECT signal circuit. If the PCM detects an excessively low ECT signal voltage, which is a high temperature indication, DTC P1114 sets.
Conditions for Running the DTC

The engine run time is more than 5 seconds.
Conditions for Setting the DTC

The PCM detects an intermittent high ECT sensor temperature while the engine is running, and the run time exceeds 5 seconds.
Action Taken When the DTC Sets

Conditions for Clearing the DTCDiagnostic AidsTest Description

The number below refers to the step number on the diagnostic table.

  1. If there are no driveability complaints associated with this DTC, and if the DTC does not reset, the system is OK.
Step
Action
Yes
No
Schematic Reference:
Engine Controls Schematics
1
Did you perform the Diagnostic System Check-Engine Controls?
Go to Step 2
Go to Diagnostic System Check - Engine Controls
2
  1. Install a scan tool.
  2. Turn ON the ignition.
  3. Start the engine.
Does the scan tool indicate that DTC P0117 also failed?
Go to DTC P0117
Go to Step 3
3
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, observe the ECT sensor temperature while moving the sensor connector and the PCM connector.
Does the scan tool indicate an abrupt change in value?
Go to Step 6
Go to Step 4
4
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, observe the ECT sensor temperature while moving the wiring harness at the sensor and the PCM.
Does the scan tool indicate an abrupt change in value?
Go to Step 7
Go to Step 5
5
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC, or within the parameters observed in the Freeze Frame/Failure Records.
Does the DTC reset ?
Go to Diagnostic Aids
System OK
6
Repair the connector or terminal as necessary. Refer to Circuit Testing , and to Connector Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 8
--
7
Repair the harness or wiring as necessary. Refer to Circuit Testing , and to Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 8
--
8
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?
Go to Step 2
Go to Step 9
9
With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?
Go to Diagnostic Trouble Code (D

Nov 04, 2012 | Cars & Trucks

1 Answer

Jetta 1996 p0117 code


Hi there:
DTC P0117 - Engine Coolant Temperature (ECT) Circuit Low Input
The ECT (Engine coolant temperature) sensor is a thermistor located in the engine block or other coolant passage. It changes resistance with changes in temperature of the coolant that it's in contact with. It's usually a two wire sensor. One wire is a 5 volt reference from PCM (Powertrain Control Module) and the other is a ground supplied from PCM.

As the temperature of the coolant changes, the resistance of the sensor changes. When the engine is cold, the resistance is high. When the engine is warm, the resistance is low. If the PCM detects a signal voltage lower than the normal operating range of the sensor then P0117 code will set.

Potential symptoms include:
MIL (Malfunction Indicator Lamp) illumination
Poor fuel economy
Poor drivability
Engine may run rough or blow black smoke out the tailpipe
May not idle
May start and then die

Potential causes of the P0117 code include:
Bad ECT sensor
Short to ground on ECT signal circuit
Faulty or damaged connectors
Wiring harness damaged
Loose terminals at ECT or PCM
POSSIBLY an overheated engine
Bad PCM

Possible Solutions:
Since this code is for an abnormally low signal to the PCM from the ECT, the PCM saw a excessively "hot" condition in the engine coolant. This could be due to faulty ECT sensor or wiring, but it could, conceivably, be caused by an overheated engine.So if your engine was overheated diagnose that first. Having said that here are the possible solutions:

Using a scan tool, with KOEO (Key on engine off) check the ECT reading on the display. On a cold engine the ECT reading should match the IAT (Intake Air Temperature) sensor reading. If it doesn't, replace the ECT sensor.

1. If the ECT reading is showing an excessively hot reading, for example more than 260 deg. F, then unplug the ECT sensor. This should cause the ECT reading to drop to the extreme cold reading (around -30 deg.F or so). If it does, replace the sensor, because it's internally shorted. If it doesn't change the reading, the check for a short to ground on the signal circuit of the ECT wiring. It could be that the two ECT wires are shorted to each other. Look for any chafing or melted wiring. Repair as necessary.

a. If you can't find any wiring problems and the ECT reading doesn't drop to the extreme coldest when unplugged, then, check for voltage coming out of the PCM on the signal wire's pin at the PCM connector. If there isn't any voltage, or it is low, then the PCM may be bad. NOTE: On some models it is possible for the 5 Volt reference signal to be temperarily shorted. This can happen if an engine sensor internally shorts the 5 Volt reference. Since the 5 Volt reference is a "shared" circuit on many models, this will cause it to be abnormally low. Usually, though this will be accompanied by several other sensor codes. If you suspect that may be the case, unplug each sensor until the 5 Volt reference reappears. The last sensor unplugged is the offending sensor. Replace and recheck the signal wire from the PCM connector

2. If the scan tool ECT reading seems normal at this time then the problem may be intermittent. Use a "wiggle" test to manipulate the wiring harness and connectors while watching the ECT reading on the scan tool. Repair any wiring or connectors that are loose or corroded. You could check the Freeze frame data if your scan tool has that function. It will show the ECT reading when the failure occurred. If it shows the reading to be at the hottest extreme then replace the ECT sensor and see if the code reappears.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jan 12, 2012 | 1998 Volkswagen Jetta

2 Answers

Code p117


P0117 - Engine Coolant Temperature (ECT) Circuit Low Input
The ECT (Engine coolant temperature) sensor is a thermistor located in the engine block or other coolant passage. It changes resistance with changes in temperature of the coolant that it's in contact with. It's usually a two wire sensor. One wire is a 5 volt reference from PCM (Powertrain Control Module) and the other is a ground supplied from PCM.

As the temperature of the coolant changes, the resistance of the sensor changes. When the engine is cold, the resistance is high. When the engine is warm, the resistance is low. If the PCM detects a signal voltage lower than the normal operating range of the sensor then P0117 code will set.


Potential symptoms include:
MIL (Malfunction Indicator Lamp) illumination
Poor fuel economy
Poor drivability
Engine may run rough or blow black smoke out the tailpipe
May not idle
May start and then die

Causes: Potential causes of the P0117 code include:
Bad ECT sensor
Short to ground on ECT signal circuit
Faulty or damaged connectors
Wiring harness damaged
Loose terminals at ECT or PCM
POSSIBLY an overheated engine
Bad PCM

Possible Solutions:
Since this code is for an abnormally low signal to the PCM from the ECT, the PCM saw a excessively "hot" condition in the engine coolant. This could be due to faulty ECT sensor or wiring, but it could, conceivably, be caused by an overheated engine.So if your engine was overheated diagnose that first. Having said that here are the possible solutions:

Using a scan tool, with KOEO (Key on engine off) check the ECT reading on the display. On a cold engine the ECT reading should match the IAT (Intake Air Temperature) sensor reading. If it doesn't, replace the ECT sensor.

1. If the ECT reading is showing an excessively hot reading, for example more than 260 deg. F, then unplug the ECT sensor. This should cause the ECT reading to drop to the extreme cold reading (around -30 deg.F or so). If it does, replace the sensor, because it's internally shorted. If it doesn't change the reading, the check for a short to ground on the signal circuit of the ECT wiring. It could be that the two ECT wires are shorted to each other. Look for any chafing or melted wiring. Repair as necessary.

a. If you can't find any wiring problems and the ECT reading doesn't drop to the extreme coldest when unplugged, then, check for voltage coming out of the PCM on the signal wire's pin at the PCM connector. If there isn't any voltage, or it is low, then the PCM may be bad. NOTE: On some models it is possible for the 5 Volt reference signal to be temperarily shorted. This can happen if an engine sensor internally shorts the 5 Volt reference. Since the 5 Volt reference is a "shared" circuit on many models, this will cause it to be abnormally low. Usually, though this will be accompanied by several other sensor codes. If you suspect that may be the case, unplug each sensor until the 5 Volt reference reappears. The last sensor unplugged is the offending sensor. Replace and recheck the signal wire from the PCM connector

2. If the scan tool ECT reading seems normal at this time then the problem may be intermittent. Use a "wiggle" test to manipulate the wiring harness and connectors while watching the ECT reading on the scan tool. Repair any wiring or connectors that are loose or corroded. You could check the Freeze frame data if your scan tool has that function. It will show the ECT reading when the failure occurred. If it shows the reading to be at the hottest extreme then replace the ECT sensor and see if the code reappears.

Hope this helps (remember to rate and comment this answer).

Jun 16, 2011 | 1997 Honda Accord

1 Answer

Code po117a what does this mean


P0117 - Engine Coolant Temperature (ECT) Circuit Low Input

The ECT (Engine coolant temperature) sensor is a thermistor located in the engine block or other coolant passage. It changes resistance with changes in temperature of the coolant that it's in contact with. It's usually a two wire sensor. One wire is a 5 volt reference from PCM (Powertrain Control Module) and the other is a ground supplied from PCM.

As the temperature of the coolant changes, the resistance of the sensor changes. When the engine is cold, the resistance is high. When the engine is warm, the resistance is low. If the PCM detects a signal voltage lower than the normal operating range of the sensor then P0117 code will set.

Potential symptoms include:
* MIL (Malfunction Indicator Lamp) illumination
* Poor fuel economy
* Poor drivability
* Engine may run rough or blow black smoke out the tailpipe
* May not idle
* May start and then die

Causes: Potential causes of the P0117 code include:
* Bad ECT sensor
* Short to ground on ECT signal circuit
* Faulty or damaged connectors
* Wiring harness damaged
* Loose terminals at ECT or PCM
* POSSIBLY an overheated engine
* Bad PCM

Possible Solutions: Since this code is for an abnormally low signal to the PCM from the ECT, the PCM saw a excessively "hot" condition in the engine coolant. This could be due to faulty ECT sensor or wiring, but it could, conceivably, be caused by an overheated engine.So if your engine was overheated diagnose that first. Having said that here are the possible solutions:

Using a scan tool, with KOEO (Key on engine off) check the ECT reading on the display. On a cold engine the ECT reading should match the IAT (Intake Air Temperature) sensor reading. If it doesn't, replace the ECT sensor.

1. If the ECT reading is showing an excessively hot reading, for example more than 260 deg. F, then unplug the ECT sensor. This should cause the ECT reading to drop to the extreme cold reading (around -30 deg.F or so). If it does, replace the sensor, because it's internally shorted. If it doesn't change the reading, the check for a short to ground on the signal circuit of the ECT wiring. It could be that the two ECT wires are shorted to each other. Look for any chafing or melted wiring. Repair as necessary.
a. If you can't find any wiring problems and the ECT reading doesn't drop to the extreme coldest when unplugged, then, check for voltage coming out of the PCM on the signal wire's pin at the PCM connector. If there isn't any voltage, or it is low, then the PCM may be bad. NOTE: On some models it is possible for the 5 Volt reference signal to be temperarily shorted. This can happen if an engine sensor internally shorts the 5 Volt reference. Since the 5 Volt reference is a "shared" circuit on many models, this will cause it to be abnormally low. Usually, though this will be accompanied by several other sensor codes. If you suspect that may be the case, unplug each sensor until the 5 Volt reference reappears. The last sensor unplugged is the offending sensor. Replace and recheck the signal wire from the PCM connector

2. If the scan tool ECT reading seems normal at this time then the problem may be intermittent. Use a "wiggle" test to manipulate the wiring harness and connectors while watching the ECT reading on the scan tool. Repair any wiring or connectors that are loose or corroded. You could check the Freeze frame data if your scan tool has that function. It will show the ECT reading when the failure occurred. If it shows the reading to be at the hottest extreme then replace the ECT sensor and see if the code reappears.

Other ECT sensor and circuit related DTCs: P0115, P0116, P0118, P0119, P0125, P0128

Hope this help to check and solve it.

Jan 19, 2011 | 2004 Chevrolet Impala

1 Answer

1989 Honda Civic hard starting and dies for no reason. Cooling fans not working. Trouble codes are #6 coolant, #10 air intake temp, #16 fuel injector. Can anyone lead me to a solution for these problems?


6
Accord Civic CRV CRX Del Sol Odyssey Prelude
85-98 86-98 97-98 85-91 93-97 95-98 85-98 ECT Sensor (Engine Coolant Temperature)
defective circuit or unplugged / defective sensor
10
Accord Civic CRV CRX Del Sol Odyssey Prelude
85-98 86-98 97-98 85-91 93-97 95-98 85-98 IAT Sensor (Intake Air Temperature)
defective circuit or unplugged / defective sensor
16
Accord Civic CRV CRX Del Sol Odyssey Prelude
90-95 88-95 n/a 88-91 93-95 95 88-95 Fuel Injector System
defective circuit or unplugged / defective fuel injector

check your wiring for dirty connections or broken wires, you may have wires that are rubbed through or connectors that are not making full contact. you will need an ohm meter and check wires for continuity. a wiring diagram will be needed.

May 15, 2009 | 1989 Honda Civic

3 Answers

HAVE 4 DTC'S.DO I HAVE TO REPLACE SENSORS


If you will ask ther others mostly on car company they 'll sey replace . I guess you' ll just have to look at the wiring and repair the damage of the circuit . now the alternator check the rotor coil and the bushing . It looks like your car is made in different models you can replace the spare parts if it is not anymore working . but first try to do atemp on fixing them . since all the damage is only wirings try to use tester amplepier. this one is use for circuit problem . remember that black is for positive and red is for negative . if first check goes to the negatvi fix . and if the tester wont work on the circuit of the spare part replace the spare part.

Apr 11, 2009 | 1992 Dodge Caravan

2 Answers

Starting problems


This is caused by the PCM not powering up. I would replace the PCM power relay in the battery junction box(fuse box under hood).

Feb 05, 2009 | 1997 Ford Thunderbird LX

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