Engine/Transmission (1998.5 - 2002) Dash DTC p1693, OBD P0237

[JGB]

I am a long time reader, first time writer. For about 6 months I've been getting p0122 and p1693 intermittently along with occasional dead throttle and weird torque converter lock or unlock. I knew my batteries were shot and everything seemed to work fairly well on longer trips. Until a couple of weeks ago the engine almost died when I started to accelerate after a traffic slow down. I pulled over to the side of the road and it started to run just fine. Five miles down the road I pulled up to a red light and it died. Would not start. Had it towed home and I found no pressure at the injector pump, a filthy fuel filter(no water), Raptor is cavitating. I had to blow in to the tank from the pump in order to get fuel to the pump. Blew out the fuel lines, replaced the fuel filter, bled the system, got 15 psi at the injector pump, bled the injectors and it started with no check engine light.



I installed new batteries and put some treatment in the tank. Pressure at the injector pump is down to 13 psi and I now get a solid p1693 on the dash and the OBD II read 2 p0237s and they will not clear. When I erase the codes, the check engine light blinks off for a split second and comes right back on. Why can't I clear the codes? Why are they not the same? I'm only a shade tree mechanic, but what did I do wrong? Should I be happy that I don't have the p0122 any more? Am I fighting a phantom bad connection or ground? Any help will be greatly appreciated.

 

[JLandry]

Assuming there's nothing wrong with the engine wiring harness, replace the MAP sensor and see if the P0237 DTC goes away. That code is caused by the ECM detecting low voltage from the MAP sensor.



Good luck,



John L.

 

[JGB]

Thanks for the tip. I think I'll spend some time on connectors first since the only change between no codes and solid codes was the new batteries. I may have disrupted something. Sorry my truck profile did not show up. After 30 years fixing computers, I forgot that they just will not do what you do not tell them to do.

2001 2500 extended cab 4wd, Banks Powerpack, exhaust brake, ATS Transmission, 411 rear end, Raptor, etc.

 

[JGB]

It's solved for now. I removed the OBD II for a while. I put the thing back in, read the codes and erased them fine. The codes have not come back yet, but I have only put about 20 miles on it. I would normally get the p0122 and p1693 by this time if I was just running around town. I really think the new batteries have fixed my TPS (I'm sorry and apologize to the purists... APPS) I will be watching my fuel pressure closely to determine when I need to replace the fuel filter. I will update again after I have some miles on it and get a better feel for the overall performance.

I am still quite perplexed about getting the codes by installing batteries and why the dash readout is different than the OBD II. I guess that is just something to worry about in my spare time.

Thanks for the help.