I have a '93 FLD120 with an N14. Lately the red stop engine light has been turning on sporadically (displays for a few seconds the goes out) so I went and had any fault codes pulled from the ecm. The codes 123, 132 & 352 were shown as inactive.
I searched and found the description of each code:
123 Intake Manifold Pressure Sensor Circuit
132 Accelerator Position Sensor Choice
352 Sensor Supply Circuit (although on the ecm printout it has a description of cruise control/PTO, engine brake don't work. My cruise control indeed does not work, I do not have a PTO and my jakes work fine.)
Would the 123 code be the same as the boost sensor? Reason I ask is cause that sensor has recently been replaced.
Would the 132 code mean something is possibly up with the throttle position sensor on the accelerator pedal?
I am baffled by the 352 code. Is it possible the other two codes could be the cause of the 352 code?
I have a print out of the codes and noticed a fault parameter of Total ECM Time (Key On Time). For example, on code 123 is 36:43:44 (hh:mm:ss), what does it mean and how do I interpret it? For the same code I also see column PID that has a value of 102 and a column J1587 FMI with a value of 4, what does these mean?
Things already replaced:
Engine position sensor, fuel solenoid, boost sensor, speed sensor (on back of trans), power and ground wires from batteries to ecm, battery cables and ignition switch
I could go on with questions about the meaning of the other fault parameters, but this is already getting to be a big read.
N14 - got ecm codes 123, 132 & 352
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PID, PPID, MID, FMI, and SID are all SAE terms for fault codes. SAE has a standardize set of fault codes. for cummins purposes, these are not needed as cummins has their own set of fault codes you should follow rather than these.
MID - Messenger Identifier. This tells you which computer is setting the fault code. Engine ecu MID is 128.
PID - Parameter Identifier. This tells us the sensor, sending unit, or actuator sending the fault. PID 102 is for the intake sensor.
FMI - Fault Mode Identifier. This tells us the type of failure. FMI 4 is voltage low.
Useless information, only Volvo (that I know of), uses SAE fault standards. Most everyone else has their own set of fault codes.joecitizen Thanks this.
a couple of months ago i was lost power to the ecm and needed a tow to the shop. new wiring (ground & power) from the batteries to the ecm was installed. i dont know if the code(s) in the computer were cleared when this happend. could these three codes be from that?
all three of these codes show as being inactive.
it seems to me that they did clear the codes. if they hadn't, you would have still had an inactive 434 code in there for loss of battery power. if it was me, i'd just continue driving it since the codes are inactive. the worst thing, for your wallet at least, is to bring the truck to the shop. when you have intermittent codes like the ones you have, its very hard to diagnose. you may spend a lot of money at this point having someone try to figure it out. but if you continue to drive it and wait until it gets worse, the code may be active all of the time and it will be much easier to troubleshoot.
i know it sounds ### backwards to wait until a problem gets worse, but in this case, it would be the right thing to do.
oh and something i forgot to mention, the 132 code is the only code that will turn on the stop engine light and not the check engine light. something to think about.
i went ahead and replaced the throttle position sensor anyways... so far so good...
... now on to why my cruise control isnt working and why the ecm thinks the service brake switch is depressed...
thank you for your help!Last edited: Dec 27, 2011
been a few days now since replacing the throttle positions sensor and the only complaint i have is the throttle seems to "kick in" when the pedal is about half way through its range of motion.
besides the instruction given earlier in this thread about re-calibrating the tps, is there anything else that needs to be done? i have calibrated the throttle as instructed twice and no change.
originally the throttle pedal had a tps and an idle validation switch. the new tps is an integrated one, so there is no longer a separate idle validation switch. with this newer style tps, do i need to take the truck to cummins and have the ecm tweaked so i can get the full range of the throttle back?
besides calibrating the throttle, there isn't much else you can do. all i can say is to make sure you had the right part installed. although, if you idle the engine, can you go through the full rpm range? what i mean is........ can you say hold the engine speed at 800, 1100, 1300, 1500? if you can't do this, the tps is failed and the engine is only going off of the idle validation switch.
truck idles fine, goes through the rpm range fine, well until i bottom out the throttle pedal. everything seems normal, yet i run out of throttle pedal travel. it is like the tps sensor isnt doing anything until the throttle pedal is half way depressed.
if i provide the part # of the tps i was given, do you have the ability to look it up to make sure freightliner gave me the correct one?
i hope i am describing what is happening correctly, truck responds great , idles fine only problem i seem to have is i dont get the full range of the throttle pedal.
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