P0237 - low volt

P0112 - low volt

P01475 - 5v high

DTCs popped up a few days ago. Had noticed a very slight surge in light throttle circumstances. Also my truck goes into high idle and its 60-80 degrees out. I unplugged my tst from the map to see if that was the issue. No luck

I have gone nuts cleaning all my grounds. Used an old thread on here to help locate them all. Only ground I missed is behind the starter. Plan on pulling starter to rule it out. Ive cleaned map and IAT connections. Going to pull the sensors tonight and clean them. I cant find any pinched or scored wires. I have 5volts at the MAP connection and the IAT connection. Code cant be cleared (using smarty). I dissconected negatives on batts for 2 hours and codes are still present.

Should i continue hunting for a bad ground/scored wire? Should I go ahead and buy new sensors? (seems odd for both to go at once) Local dealer wants $306 for new map sensor and they claim I need a harness to go with it.... On Genos websight they sell the 01-02 map and it states the 02 trucks require harness adaptor...

"02 trucks require 3104228 MAP Sensor Wiring Harness."

Any help would be greatly appreciated. I put this up on cumminsforum with no responces.

Are both your batteries holding the proper charge? How about your Battery cables ?

I was having numerous problems with my 5.9 Cummins so I started from the beginning. New Batteries and total Battery cable replacement made a big difference.

P0237 - low volt

P0112 - low volt

P01475 - 5v high

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes-cummins/146-p0112-intake-air-temp-sensor-voltage-low

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes-cummins/167-p0237-map-sensor-voltage-too-low

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes-cummins/216-p1475-auxiliary-5-volt-output-too-high

 

 

I have gone nuts cleaning all my grounds.

 

Only ground you got to clean is the battery cable. All other body grounds are for accessories (lights, horn, etc.) The ECM, PCM and VP44 are only grounded to the battery cable.

 

 

"02 trucks require 3104228 MAP Sensor Wiring Harness."

 

2002 MAP sensors are no longer made and everyone uses the 2001 MAP sensor in place of with a adapter harness but before you do this follow the diagnostics links above.

Are both your batteries holding the proper charge? How about your Battery cables ?

I was having numerous problems with my 5.9 Cummins so I started from the beginning. New Batteries and total Battery cable replacement made a big difference.

Both Batteries are 3 months old. All cables have been checked and all connections are clean.

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes-cummins/146-p0112-intake-air-temp-sensor-voltage-low

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes-cummins/167-p0237-map-sensor-voltage-too-low

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes-cummins/216-p1475-auxiliary-5-volt-output-too-high

 

 

Only ground you got to clean is the battery cable. All other body grounds are for accessories (lights, horn, etc.) The ECM, PCM and VP44 are only grounded to the battery cable.

 

 

2002 MAP sensors are no longer made and everyone uses the 2001 MAP sensor in place of with a adapter harness but before you do this follow the diagnostics links above.

I will try the diagnostics but I dont have a drb3 live scan tool.

My map sensor looks exactly the same as the one pictured on Genos website. Not sure why I would need an adaptor...

Thanks for the help

As of OBDII too you could use a OBDLink LX to read codes or erase codes. Cheaper than a ScanGauge II and much easier to use.

Im using a smarty to check and clear codes. Confused on your article about the p1475 diagnostics. Where do you collect the values in step 1? What is this Freeze frame dtc? Does this have to be done with a live data tool?

Does my wire tap have anything to do with this code?

I went ahead and replaced both my IAt And MAP sensors and I still have all three codes. Clearly its not the sensors themselves.

Im trying to understand and do the diagnostics you shared but im a novice at testing this stuff. Im going to have a buddy of mine verify Im doing these test correctly and report back.

My notes from testing the map sensor at idle.

I have 5.2 volts off the #1 pin/orange wire grounded off to the truck.

I have 5.0 volts off the #1 pin/orange wire grounded to #3 pin.

I have 4.8 volts off the #1 pin/orange wire grounded to the #2 pin.

Does this indicate bad ECM? Is there further testing I can do?

My notes from testing the map sensor at idle.

I have 5.2 volts off the #1 pin/orange wire grounded off to the truck.

I have 5.0 volts off the #1 pin/orange wire grounded to #3 pin.

I have 4.8 volts off the #1 pin/orange wire grounded to the #2 pin.

Does this indicate bad ECM? Is there further testing I can do?

 

 

Just need to measure from pin 1 to 3. That is your 5.0 volts. That is correct. Now disconnect both the ECM and the MAP sensor and ohm from end to end. That will validate the wiring to be good. If you get 0-5 ohms your good anything above that is a failed wire. Now while they are disconnected yet. Now ohm from MAP sensor to ground. All 3 should turn out infinite ohms which proves that nothing is shorted to ground.

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes-cummins/167-p0237-map-sensor-voltage-too-low

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes-cummins/146-p0112-intake-air-temp-sensor-voltage-low

After completing all of your diagnositics im convinced its my ECM. Whats the best way to go about replacing?

Find used? Dealer only?

Klein Bottle Computer

http://www.kleinbottlecomputer.com/collections/all-services/products/dodge-1

 

There is another gent here that found a spot in Florida...