Question about 1994 Dodge Ram

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Can spliced wires to a nuetral park starting switch can have no firing to the motor? and does the pcm supposed to have a high pitch squeel to it?

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The PCM can make this noise, I would not worry about it. The wiring to the P/N switch would likely cause the starter to not engage if compromised.

Posted on Jun 28, 2009

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No injector pulse 4 cyl 93 f250 460


if you have a $5 test light, you could find the problem. just know that all eight injectors have a constant voltage applied to them anytime the key is in run or start. and also that 4 of the injectors share a common ground, they have their ground wires spliced together before the ground wire enters the pcm to be internally grounded. and the other four injectors are the same- their ground wires splice together. so your four that don't pulse have lost either the power to them, or the common ground wire for the 4 may have broken. or lost connection.

it is easier to check the power side first, so clip a test light lead to the negative battery post or cable, turn the key to on,and probe each injector connector. one of the terminals at all eight injectors will be the power wire, and it should light up the test light. if all eight injectors have power to them, you know it must be a ground side problem. if you find that 4 injectors have no power to them, look for a broken splice in the power wire to all injectors. back in those days, injectors were "bank fired". one side or bank of the engine all had the injector grounds spliced together, so all injectors on one bank fired (pulsed) simultaneously, and then the other bank was fired or pulsed. that was good until sequential injection matched the pulse to the cylinder ready to fire, more precise, and in the modern systems each injector ground has a separate ground inside the pcm. no more splicing of the ground wires, and having bank fired engines.


when the pcm grounds the circuit, the injector coil is energized and the injector opens to spray fuel out. so the injector has constant voltage to it. only when the circuit is grounded is that power applied across the injector.

Jan 22, 2015 | Cars & Trucks

2 Answers

97 buick park avenue change cam and crank sensor still no fire


asd relay or fuse
camshaft not spinning
bad pcm
damaged wiring harness

Mar 25, 2013 | 1997 Buick Park Avenue

1 Answer

I have a 93 4runner Toyota and we just changed it from a automatic to a standard. The car wont turn over due to the wiring to only start in park! We need this problem solved


Because you now do not have a postion in the transmission to tell the PCM that the car is in nuetral your asking for something that isnt going to be easy to accomplish. Since your so handy what I suggest is go to mitchelldiy online and pay the 10 bucks and get all the wiring diagrams you need. Your going to have to rig up a switch to the wire that tells the PCM that your in nuetral.

Apr 03, 2010 | Toyota 4Runner Cars & Trucks

1 Answer

The heater fan on my 98 chevy silverado stopped working... worked on high at first but made a high pitched noise and stopped all together


Run 12V directly to the motor and see if it will run, if it dosent than the motor is bad, if it does than the resister is bad, the resister makes the blower run and also regulates the speeds for the blower, but chanses are if it was making a high pitch squeel before it quit the motor went out.

Dec 10, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Does the pcm suppose to have a high squeell pitch to it? and can the nuetral safety sensor cause no firing to the motor? v6


No,the pcm is not making the noise,unless it's a bad or shorted relay. If you don't have 12 volts at the battery,it may not start. You need a full 12 to run the computer. The switch hardly ever goes bad but yes that will cause a no-start. Write more info next time please.

Jun 28, 2009 | 1994 Dodge Ram

1 Answer

Very hot alternator after just replacing and a high pitch squeel


THE ALTERNATOR CAN GO OUT DUE TO A WEAK OR BAD BATTERY CAUSING IT TO OVERCHARGE TRYING TO KEEP UP WITH DEMAND ON THE ELECTRICAL SYSTEM. IT WILL HAVE A HIGH PITCH NOISE WHILE CHARGING AT A HIGH RATE AND FINALLY IT TO WILL GO BAD.

HAVE THE BATTERY TESTED AND CHECK THE CHARGE RATE AT THE ALTERNATOR AND AT THE BATTERY.

Jun 02, 2009 | 1987 Chevrolet Camaro

1 Answer

Wont start in Park But will start in Nuetral


Neutral safety switch usually threaded into transmission, unless AW-4 model. Same switch used to trip back-up lights. Look for harness with approx 3-4 wires, unplug & unscrew switch from transmission.

Apr 11, 2009 | 1994 Jeep Grand Cherokee

1 Answer

Engine wont crank


im looking at that circuit , on the start relay on your radiator support , red is always hot via fusible link , purple to solenoid as you say , orange/black wire should be hot in run or start mode , if it is not the fuse for that wire is PCM/ABS 10 amp located fuse block in driver door jam , it does go through the nuetral saftey switch , the yellow wire going to the PCM must ground that relay to activate start mode . last note there is a PCM/CRANK fuse in the driver door jam also , 10 amp , if all this is good i would like to hear more . 1 more note about the nuetral saftey switch is the pink wire going in and the orange/black wire coming out should have continuity in park and nuetral ....let us know thanks

Dec 31, 2008 | 2000 Chevrolet Venture

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