Archived boost problem

[RWelling]

I HAVE A 98. 5 2500 WITH THE 24 VALVE & AUTO TRANS. I PULL A 15K 5TH WHEEL. I INSTALLED A TST POWERMAX 2, 4 " EXHAUST, K&N AIR FILTER, AND A SUNCOAST transmission. WHILE PULLING THE 5VER RECENTLY I TRIED TO PULL OUT OF A PARKING LOT THAT HAD A MODERATE GRADE AND THE TRUCK WOULD NOT GO, NO POWER. I THOUGHT THAT EITHER THE TRANS WAS IN 2ND OR THE TURBO WAS NOT KICKING IN. I REVED IT AND PUT IT IN GEAR AND GOT GOING. LATER THIS HAPPENED AGAIN AND ALSO AT 70MPH I SLOWED DOWN FOR TRAFFIC AND WHEN I TRIED TO ACCELERATE THE TRUCK HAD NO POWER, IT SLOWED DOWN EVEN WITH THE PEDAL DOWN TO WHERE I SHUT OFF OVERDRIVE AND AFTER ABOUT 6 OR 7 SECONDS OF STILL TRYING TO ACCELERATE THE ENGINE RPM AND POWER PICKS UP AND I'M BACK ON MY WAY. THE CHECK ENGINE LIGHT HAS BEEN ON AND OFF. I TOOK IT TO AUTOZONE WHERE THEY READ THE CODES, IT CAME UP P1693, TURBO CHARGE CIRCUIT MALFUNCTION, PO237, THE PCM HAS DETERMINED THE THE INPUT VOLTAGE FOR BOOST PRESSURE SENSOR "A" IS TO LOW FOR THE CURRENT ENGINE OPERATING CONDITIONS, AND CODE PO622, THE PCM HAS DETERMINED THAT A MALFUNTION EXISTS IN THE GENERATOR LAMP "F" CONTROL CIRCUIT. ASSUMING THE TRANS IS NOT THE PROBLEM BUT DON'T KNOW ABOUT WHAT TO DO WITH THE CODES. ANY HELP WITH THIS WOULD BE APPRECIATED THANKS, RICK

 

[Alan Reagan]

At first it sounds like you may have a bad MAP (pressure) sensor. With the low voltage indication, the ECM is not allowing the engine to fuel.



Before I do that, I would unplug the TST Powermax. That may be your problem. I've had the low voltage error set because of a bad VA box. Common failure in boxes. May have put your truck in the limp home mode.

 

[B.G. Smith]

Originally posted by Alan Reagan

"At first it sounds like you may have a bad IAT (pressure) sensor". Alan, wouldn't that be the MAP for pressure? bg

 

[Alan Reagan]

Yes, My apologies. I'll go back and edit. Thanks, B. G. Alan

 

[RWelling]

I RECENTLY REPLACED THE(MAP SENSOR) BOOST SENSOR. I BOUGHT ONE AND THEN DISCOVERED THE PLUG HAD COME LOOSE SO I REPLACED IT ANYWAY AND MADE SURE THE PLUGS WERE SECURE, A SHORT TIME AFTER THIS I STARTED TOWING THE HEAVY LOAD AND THE PROBLEM STARTED. I COULD PUT THE OLD ONE BACK IN.