are there fault codes on a 12v? how do you retrieve them

[shendren]

thanks. scott.

 

[Dieselnerd]

You need a service manual first. Then the key is cycled on and off several times, I think 3 but I haven't done it for a long time. The light on your dasboard will then flash a number of times, you have to count them to get the code and the service manual tells you what the code means. Depending on the year of your truck, you may be able to use an OBD II scanner. I believe that starts with the 1996 models. That may also be the year that the key cycling begins, mine is a '96 and I know it works that way but I can't speak for certain about earlier models.

 

[Missouri Mule]

shreden,



using the malfunction indicator lamp (mil)



" 1. Cycle the key On- off-On-off-On within 5 seconds.



2. Count the number of times the MIL (check engine lamp) on the instrument panel flashes on and off. The number of flashes represent the trouble code. There is a slight pause between the first and second digits of the code.

Longer pauses seperate individual two digit trouble codes. "



Read in a magazine (auto, truck and/or computer) that a pc/laptop could be connected to connector but you need to have program disc for your make and model.



The cheapest way is to use key method.

 

[dcash]

shendren,

missouri mule is exactly right. onoff onoff on, then count, the codes that have the ** by them are codes that will display during engine operation, in other words they are the ones that will trip the check eng light. and note: not all trouble codes apply to all models. these are out of the haynes manual and apply to 94- thru 98 at least. i know its long but maybe it will help.





11 = no crank reference signal detected during engine cranking

12 = no codes. problem with the battery connection. direct battery input to the PCM disconnected within the last 50 ignition key-on cycles.

15** = no vehicle speed sensor signal. no VSS signal detected by the PCM during driving conditions.

23** = intake air temp sensor voltage high or low. intake manifold air temp sensor circuit signals above or below the acceptabel voltage.

24** = (TPS) voltage too high or low. test throtle position sensor.

33 = air conditioner clutch relay circuit. an open or shortened condition detected in the air conditioning clutch relay circuit.

34 = open or shortened condition detected in the speed control vaccum or vent solenoid circuits.

37** = (TCC) solenoid circuit open or shortened

37** = trans temp sensor voltage too above or below acceptable voltage values

41** = problem with the charging system. when voltage from ASD relay is below 11. 75-volts.

42 = ASD control circuit indicates an open or shortened circuit condition.

44 = battery temp sensor volts malfunction. problem with batt temp voltage circuit in the PCM

45 = trans overdrive solenoid circuit malfunction.

46** = charging system voltage too high.

47** = charging system voltage too low. batt volts sens input below target charging woltage during engine operation and no significant change in voltage detected during active test of alternator output.

53 = internal PCM failure detected.



55 = COMPLETION OF FAULT CODE DISPLAY ON CHECK ENGINE LAMP. THIS IS THE END OF MESSAGE CODE.



63 = controller failure. EEPROM write denied. check the PCM.

68** = PCM not active or a fault condition ot the EGR sensors and/or EGR solenoid.

 

[shendren]

holy cow... . thanks. i have a service manual. where do you find these? i am going to check to see if something is whacked. my tps seems ok but it keeps kicking in and out. thanks. scott.

 

[Missouri Mule]

If you have Dodge service manual the codes near the end of manual under emission control sytems.

Scan tool or computer will give you more detail info.

 

[bd450]

I spent $130 on a OBDII scanner at autozone.



Using the factory service manual and the check engine light sent me off on a wild goose chase with a "3 7 code". The '96 factory service manual check engine light decode table has at least one error. Maybe more for all I know.



With the OBDII I went right to the gov. pressure control ckt and sure enough I have a bad output transistor in the PCM.



good luck!

 

[Missouri Mule]

bd450,

When you purchased scanner was it set up for Dodge trucks or did you have to purchase program disc for it?

 

[bd450]

Missouri Mule,



From what I understand starting in 96 vehicle specific adapters & s/w are not required. You can get specific s/w and get access to much more data than basic fault codes, you can get mfg specific data that way.



Prior to 96 OBD wasn't very well standardized. Thats why you MAY need specific adapters and S/W.



Just the basic generic OBDII scanner was enough for me to troubleshoot my PCMs trans problem.



The specific adapters & s/w can get pricey. Found one outfit that sold Handspring PDA & s/w for OBDII. Way cool, but too pricey for my my limited needs. Around $500.



BTW, The $130 unit was behind the counter at Autozone. They had some older, costlier models out on the floor. Make sure to ask to see ALL that they have. They gotta move that old stock somehow ya know... .