I guess it has to be the really hard to get too one right 
po117 code 2003 ranger
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Laughing Gas
Joined: Feb 2004
Posts: 831
Likes: 16
From: sacramento
po117 code 2003 ranger
which one is the ect? one is the ect and one is a switch for something?
Just gone done switching that POS plastic thermostat housing thing, both sensors were replaced not sure which one is throwing the code.
I have cleared the code and it keeps coming back.
Just gone done switching that POS plastic thermostat housing thing, both sensors were replaced not sure which one is throwing the code.
I have cleared the code and it keeps coming back.
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Which engine? I believe the '03 4-banger uses a Cylinder Head Temperature (CHT) sensor to measure engine temps. (in lieu of the ECT).
If not a bad sensor, then there could be a short to ground in the wiring.
If not a bad sensor, then there could be a short to ground in the wiring.
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Laughing Gas
Joined: Feb 2004
Posts: 831
Likes: 16
From: sacramento
sigh.... code is back 4.0 who the heck designs an engine that you have to remove the intake manifold to get to the ect, and then makes a leaky plastic container to house the thermostat. GRRR
Which one is the ect and I think the other one is a switch, what is the switch for? no electric fan.
Which one is the ect and I think the other one is a switch, what is the switch for? no electric fan.
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Laughing Gas
Joined: Feb 2004
Posts: 831
Likes: 16
From: sacramento
still throwing the code I swapped the sensor out on the passenger side, as thats the only one I can get too without taking everything apart. It appears this code keeps the air conditioning from turning on, coolant guage works.
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Laughing Gas
Joined: Feb 2004
Posts: 831
Likes: 16
From: sacramento
still throwing the code I swapped the sensor out on the passenger side, as thats the only one I can get too without taking everything apart. It appears this code keeps the air conditioning from turning on, coolant guage works.
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
The one-wire temp. sensor is usually the "sending switch" used by the instrument panel temp. gauge. The two-wire sensor is usually the Engine Coolant Temperature (ECT) sensor that is used by the PCM for a variety of functions. (I have to assume it's the same way on your '03).
It's possible that a faulty ECT signal is causing the PCM to keep the A/C compressor from engaging.
The Ford Manual says code P0117 can be caused by the following:
- Grounded ECT circuit in harness
- Damaged ECT sensor
- Improper harness connection
- Damaged PCM
So you need to find the two-wire ECT sensor and replace it. If that doesn't do the trick, then you need to look closer at the ECT harness connector and wiring.
It's possible that a faulty ECT signal is causing the PCM to keep the A/C compressor from engaging.
The Ford Manual says code P0117 can be caused by the following:
- Grounded ECT circuit in harness
- Damaged ECT sensor
- Improper harness connection
- Damaged PCM
So you need to find the two-wire ECT sensor and replace it. If that doesn't do the trick, then you need to look closer at the ECT harness connector and wiring.
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Laughing Gas
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From: sacramento
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Post Fiend
Joined: Jan 2003
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From: Connecticut
I can tell you that, for an '02 Ranger 4.0L, the ECT (PCM sensor) wire colors are: light green/red stripe & gray/red stripe.
The '02 sending switch wires are red/white stripe & black/white stripe.
There's a pretty good chance the same color wires are used on the '03.
The '02 sending switch wires are red/white stripe & black/white stripe.
There's a pretty good chance the same color wires are used on the '03.
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Laughing Gas
Joined: Feb 2004
Posts: 831
Likes: 16
From: sacramento
Thanks rockledge, that would be the new motocraft one that you have to either remove the intake or unbolt the engine accessory bracket and remove the whole thermostat houseing to get too. no more 4.0s for me in the future.
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