Question about 1983 Cadillac DeVille

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Need ECM wiring diagrams for 82 cad with HT4100 engine

I am disabled on limited budget but also was ASE master tech certified. My 82 cad deville melted the ecm . No check engine light and only code 52. I can find no " visible " harness failures and would like to have at least a little better idea of pin outs before installing a 100.00 ecm and repeating failure. any ideas or sugestions would be greatly appreciated.

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Posted on Jan 02, 2017

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SOURCE: 82 Cadillac ECM wiring diagrams/ troubleshooting

if a new ECM had blown shortly after replacement, the problem is likely to be in power wiring to ECM.
Check all battery wiring to the BCM/ECM for bad connections and shorts, (shorts, corrosion etc.), and test all voltages to ecm.
Check for short to ground in ckt491 (Orange wire), check for Open or Short to Ground in ckt 526 (Brown wire).

Posted on Jul 07, 2008

  • 39 Answers


The coil will be underneath the distributor cap you have to rmove the rotor to get to it and make sure you number your spark plug wires before you remove them...............

Posted on Jun 27, 2009

  • 8832 Answers

SOURCE: I need to find out where a coolant sensor, map

The coolant sensor is on the front of the engine next to the thermostat housing where the upper radiator hose meets the engine.
The manifold pressure sensor (MAP) is on the firewall and looks like the picture below.
The ECM is in the right pillar to the right of the passenger's feet.
Please let me know if you have more questions.
See pictures below.

coolant and pressure sensors:


coolant sensor

jturcotte_16.jpg pressure/vacuum sensor:
jturcotte_17.jpg ECM location:


Posted on Nov 14, 2010

  • 104 Answers

SOURCE: hi my ecm coused fuel

sounds to me they should eat all that unless your cats were already melted down from the raw gas

Posted on Dec 17, 2010

  • 1165 Answers

SOURCE: I have a 95 cadillac eldorado codes are, 52 ECU

It means your on board computer, or ECM, is faulty and will need to be replaced.

Posted on Mar 14, 2011

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