Anyone know what this is for?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

brown3

Active Member
Joined
Mar 14, 2014
Posts
32
Reaction score
0
Location
Minnesota
image.jpg

Anyone know what this is for? When my belt broke it broke the wire. Just curious as to what it's for so if I need to fix it or not. Nothing seems wrong but just doesn't seem right being broken. Thanks for your help!!

2003 ford expedition EB v8
 

toms89

technical advisor
Joined
Mar 13, 2011
Posts
5,173
Reaction score
442
Location
MD
That is the cam position sensor. Little surprised it runs normal and did not set a cel.

The motor has both a crank position sensor and cam position sensor. Apparantly it runs fine with just the crank sensor functioning... lol. They tell the pcm the relative position of the crankshaft and cam thus control the timing of the fuel, ignition, etc....

The crank spins twice for every revolution of the cam. So with just the crank sensor the pcm has no real way of knowing if the motor is on the power stroke vs the exhaust stroke for example. It may be that the pcm "remembers" based on where it was when the cam sensor was functioning. Would not reset the pcm until the sensor wire/conn is repaired.
 
Last edited:

toms89

technical advisor
Joined
Mar 13, 2011
Posts
5,173
Reaction score
442
Location
MD
Double post!! :whymewhyme:
 
Last edited:
OP
OP
B

brown3

Active Member
Joined
Mar 14, 2014
Posts
32
Reaction score
0
Location
Minnesota
Is this something I can fix easily on my own? Like by a new sensor and reconnect wires?

When my tension pulley broke and the belt gave way the mechanic said everything was fine and no codes popped. I was just looking around and noticed it today. With this being like this what are some things that would be noticeable with it being broken?
 

toms89

technical advisor
Joined
Mar 13, 2011
Posts
5,173
Reaction score
442
Location
MD
Is this something I can fix easily on my own? Like by a new sensor and reconnect wires?

When my tension pulley broke and the belt gave way the mechanic said everything was fine and no codes popped. I was just looking around and noticed it today. With this being like this what are some things that would be noticeable with it being broken?

New connector and splice the wires.

If the pcm loses track of the cranks relative position to the cams it may not run at all. This potentially may happen if you reset the pcm or disconnect the battery.

The pcm uses these two sensors to time the injectors and ignition. Again the crank sensor tells the pcm the relative position of the crankshaft. The cam sensor tell the pcm if its on the power stroke vs the exhaust stroke. If the pcm does not know the relative position of the motor it will cease to run.
 
Last edited:
OP
OP
B

brown3

Active Member
Joined
Mar 14, 2014
Posts
32
Reaction score
0
Location
Minnesota
Do I have to buy a whole new sensor or just the connector and splice the wires and put black tape around it then just reconnect it to the sensor?
 

toms89

technical advisor
Joined
Mar 13, 2011
Posts
5,173
Reaction score
442
Location
MD
Do I have to buy a whole new sensor or just the connector and splice the wires and put black tape around it then just reconnect it to the sensor?

Sensor is likely fine. The connector does not have enough wire left to splice or work with. Don't know if new connector will come wire pigtails or not. Maybe you can get one from the scrap yard, cut an leave the wires long. I would use electrical crimps and head shrink tubing on each wire. I typically do two layers of heat shrink tubing as well.

Do not twist wires and use tape. Not very reliable.
 
B

bedrck46

would be better if you can solder the wires and then use two layers of heat shrink make the inner layer just a little longer than the solder connection and the outer longer than the inner layer
 
Last edited by a moderator:
B

bedrck46

check on rock auto for the connector the part shows the connector with pigtails
 
Top