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Runboy
Dodge Dakota
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3/02/2004
22:52:27
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 Subject: Error code to solve
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Message:
I bought a 98 jeep wrangler equipped with a 2000 4.7L Dakota engine and 45 RFE transmission.
I still have 2 error codes that I cannot clear and don’t really know what to look for.
The codes are:
1) P1495: An open or shorted condition detected in the leak detection pump solenoid circuit.
2) P1698: No CCD/J1850 message received from the electronic transmission control module (EATX) or the Aisin transmission controller.
For point 1, I replaced the LDP by another one from a 2002 jeep liberty, but the code did not clear. After looking more into the Dakota service manual, I found out the following:
The EVAP canister is now located on top of the front left fender instead of below the vehicle.
The LDP is now fixed to the EVAP canister mounting bracket.
The LDP filter is missing.
Also I tested the voltage at the LDP connector and there is 12V comming to pin 2 and 12V going out of pin 3 & 4. Is that correct?
Any tips that may help to solve this problem are welcome?
For point 2, I don’t have any clue of what it is and what to look for. Any tip on this point will be welcome too.
Thanks in advance for your help.
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Rob C
Dodge Dakota
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3/03/2004
03:04:42
| RE: Error code to solve
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Message:
First of all, have you pulled the connectors at the PCM and checked all the pins to make sure you don't have any damaged pins? Also, do the same at the TCM. There's more than one P1698 code. The other code is:
P1698 (M) No CCD/J1850 Message From PCM
Bus communication failure to PCM. A “Companion DTC” was set in both the ECM and PCM. If you don't find any problems with the pins, you're probably going to need a DRB scan tool to retrieve the exact error.
On the P1495 code, have you ohmed the circuit between pin 2 and pin 4 with the LDP solenoid de-energized? there should only be continuity between pin 2 and pin 4 when the solenoid is energized. So, with power off you should have infinite resistance between pins 2 and 4 or you have a short. Under normal operation, the pump solenoid either cycles on and off or is held on for a short period depending on whether it's in pump mode or test mode. In either case, you shouldn't see the solenoid energized for a long period of time. 12v acrossed pins 2 and 3 means the solenoid is energized. Good luck.
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Runboy
Dodge Dakota
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3/07/2004
23:02:59
|  RE: Error code to solve
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Message:
Hi Rob,
Thanks for the tip.
I'll check the LDP ASAP.
For the DRB scan tool, will I need to go to the dealer for that? Any idea how much it will cost?
Thanks.
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Rob C
Dodge Dakota
JOIN HERE
3/08/2004
00:26:51
| RE: Error code to solve
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Message:
Yes, the DRB scan tool is usually a dealer tool but, it's possible that a privately owned or franchise shop might have one. Best thing to do is call around. Good luck!
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Rob C
Dodge Dakota
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3/09/2004
02:11:47
| RE: Error code to solve
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Message:
BTW, Runboy since you have multiple problems, I think that I'd be checking the PCM connectors before I do anything else. Do you know if the 4.7L from the Dakota came with the wiring harness, PCM and TCM?
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jd
Dodge Dakota
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3/09/2004
02:30:20
| RE: Error code to solve
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Message:
another important thing to consider is computer and sensor grounds a broken or rubbed out ground somewhere can cause multiple codes
i work on bobcat loaders for a living and one broken ground strap an a toolcat can throw like 12 codes
give it a try,, or a look
later..
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Runboy
Dodge Dakota
JOIN HERE
3/10/2004
00:05:19
|  RE: Error code to solve
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Message:
Thanks for your help guys.
Rob, I ohmed the circuit and this is what I found:
With power off: between 2 & 3 = 15 ohms; between 2 & 4 = 2 ohms.
With power on: between 2 & 3 = 15 ohms; between 2 & 4 = 0.2 ohms.
The voltage between 2 & 3 = 0v with power on.
The PCM and TCM come from the donor vehicle, the harness for the most of it also; everything that go to the motor, transmission, PCM and TCM seems to be original; everything that go to the jeep, fuse box, instrument cluster and PDC are mixed between both vehicles.
I already check part of the harness because the vehicle died on the road (broken TCM, PCM,... ground). Also when checking this part of the harness (by the TCM, PCM, PDC, fuse box) I replaced all quick disconnect by solder and heat shrink tubing.
If I want to replace the complete harness and restart it from scratch where do I have to look for a complete one?
I am also going to buy a new LDP from Dodge and see if it solves the problem. But before installing it I'll ohm it first and check that there is infinite between 2 & 4.
Your help is appreciated.
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Rob C
Dodge Dakota
JOIN HERE
3/10/2004
01:35:38
| RE: Error code to solve
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Message:
Runboy, What is the voltage reading between pin 2 and ground, pin 3 and ground, pin 4 and ground? Also, never measure resistance with the power on. That's a good way to fry your ohmmeter. Does the LDP ever cycle on and off? Have you checked those pins while you start the engine and obverse the meter to see if the voltage between each pin and ground changes or does it always remain the same?
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Runboy
Dodge Dakota
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3/10/2004
21:26:44
| RE: Error code to solve
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Message:
Rob,
The voltage between each pin and ground is 13-14V and remain always the same. I kept it on, for at least 1 minute and did not see any changing.
The LDP does not seems to cycle. I don't see or hear anything in particular. But with the V8 and cold air intake just near by it is difficult to hear anything else.
I'm going to jump 2 to the batery (+), 3 and 4 to the ground and see how the LDP is reacting. I'll keep you posted.
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Rob C
Dodge Dakota
JOIN HERE
3/11/2004
01:49:44
| RE: Error code to solve
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Message:
Runboy, that sounds like a recipe for sparks. Be careful, you might want to have someone standing by as a safety observer just in case you need to shut down immediately. BTW, did you thoroughly check the 3 PCM connectors for bent or smashed pins?
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Runboy
Dodge Dakota
JOIN HERE
4/03/2004
15:46:45
| RE: Error code to solve
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Message:
Rob, I was out of town for several weeks. So I did my test and when connecting the 2 to + and 3 to -, I was able to hear the contact to activate, but when connecting 4 to - too, there was no voltage between 2 and 4.
I'm going to check again the connectors CC3 and make sure everithing is write there. And if everything is ok I will by a new LDP, and hope it will work fine.
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EDGE
Dodge Dakota
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7/08/2006
14:08:57
|  Error code P1698
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Message:
I have recieved the error codes P0551 and P1698 on my 2001 Durango... now the P0551 is the powersteering senosr which I replaced myself(3months ago)and once it was on... the code wiped itself out. Now this P1698 came up as Aux unit on the reading.. but icouldn't find the code in any book or system.,..could someone PLEASE help me with this.. and with possible cost amounts to repair or replace this issue
thanks
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