Question about Cars & Trucks
No alt, field voltage on pin #20 from PCM ! went trough 3 PCM,S. 1 engine speed sensor, disconnected trans speed sensor. what am I missing ?????
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Posted on Jan 02, 2017
SOURCE: 96 dodge ram 3500 diesel
Check the large probably 100 amp fuse under the PDC cover. Is this a 12 valve or 24 valve engine? If it's a 12 valve, it may be a bad crank sensor. It tells the PCM to turn on the ASD relay which supplies power to the alternator field.
Posted on Oct 19, 2008
Has the battery been disconnected or been low on charge in the last 50 ignition cycles?
Code 12 means that battery power has been disconnected within the last 50 ignition cycles. it does not mean there is no battery power to the computer
Pin 3 should be a red/white wire that is the constat power supply to the PCM. It is protected by a fusible link located neer the drivers side strut tower. If that link was bad the car would not start or run as it also supplieds power to the asd relay, fuel pump relay, and the ssd relay.
I would put money on the the problem being igntion (plugs wires cap rotor), compression (low cylinder compression usually cylinders 2 and 3), lack of fuel delivery (low fuel pressure, a weak or dirty injector), timin (timing belt jumped, worn distributor, look exciter ring), or possibly a plugged catalytic converter.
I would check compression first especially cylinders 2 and 3. It was pretty common for the head gasket to fail in between these two cylinders.
Posted on Feb 24, 2012
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