1992 ECM won’t read codes

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1992 ECM won’t read codes

Postby Jaenson » Fri May 25, 2018 4:23 pm

I have installed 3 ECM in the truck and scanner won’t read codes power & grds to ECM could I have just put in 3 bad modules
1992 W 350 SRW
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Re: 1992 ECM won’t read codes

Postby PToombs » Sat May 26, 2018 5:16 pm

I find it very unlikely you got 3 bad PCMs. Pretty sure the only port is for the ABS module, what are you trying to do?
pete

Just enough power to break everything behind the crankshaft.
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Re: 1992 ECM won’t read codes

Postby thrashingcows » Sun May 27, 2018 3:09 pm

To my knowledge that code reader port on the drivers inner fender was only for the OEM computer system at the factory or dealership. If you want any codes from the ECM pretty sure you have to do the ignition on/off thing and then count the CIL flashes.
1984/93 Dodge Crewcab, W350, 1 Ton SRW, long box, 330K Km's, M&H spacer, 366 spring, fuel pin to deep side, 14cm housing, Piston LP, PS IC, Isspro Boost, Pyro and tach, NV4500, 29 spline NP205, 3.54's.


Check out the build....http://www.dieseltruckresource.com/dev/ ... 05923.html
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Re: 1992 ECM won’t read codes

Postby Jaenson » Sun May 27, 2018 6:43 pm

Grid heaters not coming on no charging on alternator has new crank sensor when key is turned on no wait to start light comes on and tachometer is inop.
1992 W 350 SRW
Jaenson
fuel pin?
 
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Re: 1992 ECM won’t read codes

Postby PToombs » Mon May 28, 2018 5:42 am

Do you have a FSM (factory service manual)? Sounds like it's time to check wires, from the crank sensor and power / grounds to the PCM.
pete

Just enough power to break everything behind the crankshaft.
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Re: 1992 ECM won’t read codes

Postby thrashingcows » Mon May 28, 2018 1:27 pm

Jaenson wrote:Grid heaters not coming on no charging on alternator has new crank sensor when key is turned on no wait to start light comes on and tachometer is inop.


Have you swapped in new relays on the drivers inner fender? If the ASD relay is not working then you won't get any charging. Could be a bad info center....mine recently stopped working so I hit the dash with the flat of my hand a few times and smacked the info center with a big hairy knuckle....started working again. ;)

Grid heaters could be a bad AIT (Air intake temp sensor), you can try grounding out the negative pin on the solenoids and seeing if they will turn on. Then you know it's a sensor and wiring issue.

There are several wiring connections between the CPS and the ECM...you could have a bad connection at one of these points. If the CPS signal is not getting to the ECM then you will not have charging since it does not know that the motor is running, and no tach signal.
1984/93 Dodge Crewcab, W350, 1 Ton SRW, long box, 330K Km's, M&H spacer, 366 spring, fuel pin to deep side, 14cm housing, Piston LP, PS IC, Isspro Boost, Pyro and tach, NV4500, 29 spline NP205, 3.54's.


Check out the build....http://www.dieseltruckresource.com/dev/ ... 05923.html
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Re: 1992 ECM won’t read codes

Postby Jaenson » Fri Sep 14, 2018 4:39 pm

Found a pcm in Oregon for 350 bolted in all problems solved
1992 W 350 SRW
Jaenson
fuel pin?
 
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Re: 1992 ECM won’t read codes

Postby PToombs » Fri Sep 14, 2018 5:40 pm

Wow! That's weird you got 3 bad PCMs! Glad you got it up and running. 8)
pete

Just enough power to break everything behind the crankshaft.
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