Please Help Me

[Mad Bomber]

I had a fault code come up 1693 will it hurt truck to be driven? Also now the truck seems to surge off and on

 

[Steve St.Laurent]

1693 is a very common fault code it's a "DTC Detected in PCM/ECM or DTC Detected in ECM". Usually there are other codes that go with it - is that the only one that's coming up? I've had that before on my truck and haven't had any problems running it. When you say it surges on and off, could you explain further?

 

[Mad Bomber]

Truck surge

Steve, it's like as if when you push on the gas and as quickly let up rpm's change 500 to 700 but I was NOT moving my foot at all. No other code came up.

 

[MikeR]

Maybe sound like an APPS problem (accellerator pedal position sensor). Time to take it in to read the real trouble codes.

 

[Alan Reagan]

With those dyno numbers, sounds like you are running a box. Did I miss that in the signature? If you are running a box, disconnect it and see if your problem disappears. Has the check engine light stayed on? Usually the light will go out after three cranks but the fault will remain stored. The surging does sound like the APPS or possibly the Camshaft Position Indicator might be going bad.

 

[MikeR]

Alan,



Eric's ETH truck is bone stock! He sure got a good strong one at 244hp. I was there when he dynoed on BD's Mustang dyno.

 

[Alan Reagan]

That's strong. Sounds like my pre Raptor numbers. I like the ETH. Sounds like with the surging though, he has a sensor gone. With the Camshaft Position Sensor, it can put you down. Once that starts to go, it's best not to drive anymore. Thanks MikeR. That helps.

 

[griggsd]

P 1693 Code

This same code, P 1693, has recently appeared with my truck. When this occurs, all guages (temp, oil pressure, turbo boost pressure, pyro) & performance remain normal, and by cycling the ignition switch 3 times I'll get the code displayed in the ODO, the system then resets. After a few more driving cycles it will come on; again with no change in any guages, indicators or performance.



griggsd

00' 4x4 6Spd 3. 54 Factory265Michelins Banks Power Pack

 

[Alan Reagan]

Griggsd, Something is recurring to set that code and you need to find out what it is. It could be something beginning to fail and it keeps resetting. I don't have all of the codes with me right now but for instance, if the voltage regulator was having problems, the code would reset after three starts without the problem but if the problem occured again, it would reset the code. It could be a ground on the ECM or something simple or it could be a little more complicated and be something that doesn't stick you in the limp home mode or show up in the gauges. You need to check it out.

 

[griggsd]

Alan,

Appreciate your advice. The local dealership can actually get me in tomorrow morning, so I'll post a reply once the verdict is in.



griggsd

 

[griggsd]

P 1693 Code points to MAP Sensor

All,



Returned from the dealer this morning; their diagnostics pointed toward the MAP Sensor not returning sufficient voltage, which triggers the 'check engine' light, but has allowed the truck to run fine since this condition first set in. The dealer didn't have the part on-hand but will replace this part under warranty, which they see in this case as an 'emissions' issue.

Learned a couple things from this visit to the dealer. First, it is very helpful to know enough about your vehicle to ask smart questions. Second, it's important to ask if a given situation is covered under warranty, and if not, why not. In this case, I was initially given a $300 bid to replace the sensor, since the truck is beyond 3-36 warranty period. After asking a few questions of the maintenance rep, and learning that this was actually an emissions issue, I then was able to ask why it wasn't then covered. Bottom line is that TDR keeps the education curve ahead of dealer complacency. Thanks all.



griggsd

 

[Bigsaint]

Try this...

griggsd, while you are waiting for the new Map Sensor, try this... . put a small dab of dielectric grease on each of the three posts housed within the Map plug ( if you remove the plug you will see the terminals). Make sure your ignition is off when you remove the plug. I had the same re-occurring codes and it solved the problem for me.



BTW, $300. 00 is ridiculous to pay, if you had to buy the Map Sensor out of pocket the cost is around $135. 00 and it will take all of 5 minutes to replace yourself. All you need is a 1 1/4" deep socket to remove the plug.



Scott W.

 

[DarrellB]

Just read this one

Were in the world are you guys getting those map sensors? I only paid $31 for the ones that I have bought and they came from mother Cummins itself. OH wait a minute maybe the price of vasaline has went way up. :--) If you guys lived closer and tell you to come get the spare in my glove box.



See ya laterOo.

Big D

 

[Alan Reagan]

Good tip on the dielectric grease on the MAP sensor. Just another tip for those of you that run boxes (EZ, VA..... ). At the last SETDR get together, it was pointed out to me (I had a code set) that the box will cause the MAP sensor to set on overvoltage or undervoltage fault. That's why I said, if you have a box, unplug it, reset the codes and see if it comes back. If it does, it's the MAP sensor. If it doesn't, it's your box. Be sure and give it a couple of days before you make the decision as to which one it is. This problem is strange because it is not setting the fault every time. That's why I agree with the grease on the pins.



One more thing... ... you can set the code on the MAP or IAT sensor simply by unplugging either one and turning the key on. Then plug it back up. If you do that and take it to the dealer, they will check the code, then they will do a diagnostic on the wiring harness. Of course it will check out OK. Diagnosis: MAP or IAT sensor bad. Replace sensor. Really there is nothing wrong with the sensor. Just their shallow troubleshooting procedures.

 

[Mad Bomber]

IT RUNS AGAIN

Finally it works again. I found that the TPS plug was half off. Thanks for everyones help. Alan yes at that time it was bone stock

 

[griggsd]

P 1693 Thanks

Alan, BigD, Scott, Eric,



I'll walk that circuit path this weekend, dielectric-grease the MAP sensor plug, and confirm sensor connecitons as advised. I'd like to learn more about obtaining deciphering codes. For example, P 1693 came up on my ODO, the Tech Manual called P 1963 a non-specific sensor problem, the dealer then plugged in & obtained P 0237, which reads insufficient voltage from MAP sensor. Why then, didn't the ODO read P 0237?



Thanks for all assistance, the forum is paying off.



griggsd

 

[tmacc]

Question about dielectric grease. Don't you have to be careful about "bridging" from one pin to the other in the sensors or the sensor plug?