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Cadilac Eldorado wont start


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Have you checked the Fuel Pump 20 amp fuse?

Do you have power at the fuse?, it is HOT in RUN and START, its located in the engine compartment fuse/relay center

Do you have power going IN and COMING OUT of the Fuel Pump Relay (Pink at B3 is IN, and GREY at A1 is out) with the key on? It's also located in the engine compartment fuse/relay center

Answer those questions and that should be telling

Checked fuse and No there is no power at the fuse or at relay

Just for reference, a code P1632 is the Theft Deterrent System Fuel Disabled, it will not allow fuel due to a perceived theft attempt or worn or incorrect key. The MIL light will NOT illuminate, and NO message will display. This code will be set when incorrect resistence value or unrecognizable resistence value from the key is received from the key.

The theft deterrent system has a fuel enable output that it engages ONLY when it sees the proper resistance at the key, it will send a serial data message to the PCM. If the IPC does not see the proper resistance at thekey it will not send the message to the PCM

See this thread, they have the same symptom

http://www.cadillacf...um/t-67594.html

Edited by Andy G
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Very Interesting, let me look at the manual and figure out why...

Pull the fuse and check for corrosion in the socket and fuse

You checked the fuse?, there should be power on both sides with the key on....

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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OK, check the IGN1 fuse its 40 amps maxi fuse, check to see if there is power on the RED wire coming out of it.

It leads to the Ignition 1 relay which feeds S122 which splits the power between the 10 amp Cruise Fuse and the 20 amp fuel pump fuse.

If you have power at the IGN1 fuse, we need to check the IGNITION 1 relay to see why its not engaging or to see if its bad or corroded

Check to see if you have power at the A2 terminal at the ignition relay and then the C1 terminal of the ignition relay.

You need to pull these fuses and relays and check for green and white corrosion and clean the contacts

Let me know what you find

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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You are showing a CURRENT CODE - PZ2255 /Current

PZ2255 - Generic Loss of Serial Data (Source ID Unknown)

The PZM (body control module) periodically sends a request for information to other modules on the CLASS 2 data line.

This PZ2255 will set when the PZM requests information and the module which has that information is not ON LINE.

The DTC will clear when the module with the information the PZM is requesting comes back ON LINE

Troubleshooting hints

If DTC PZ2255 is set, clear DTC, CLEAR DTCs and cycle ignition. If DTC PZ2255 is still current, ensure that all the modules are functioning properly by establishing communications with each module on the CLASS 2 data bus.

Check CKT 1807 (PPL) for a short to power or ground.

If OK, replace the PZM

With this code B2750 PASSKey Data Communication Failure, it is possible that the PZM is attempting to get information from the PassKey module..

I am curious what the result will be of your voltage tests

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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DTC B2750 PASSKey Data Communications Failure

Circuit Description

When a key is inserted into the ignition switch, the terminals located in the steering column lock cylinder contact the resistor pellet in the ignition key. The IPC measures the resistance of the key pellet and then measures the resistance to the one stored in the IPCs memory.

Conditions for Setting the DTC

A malfunction occurs in the communication between the IPC and PCM. Inspect for other loss of serial data communication DTCs if this occurs.

Action Taken When the DTC Sets

The IPC displays the THEFT SYSTEM PROBLEM, CAR MAY NOT RESTART message on the driver message center.

Diagnostic Aids

If U1016 is also set, diagnose U1016 first.

If PCM DTC P1604 is also set, diagnose PCM DTC P1604 first. This condition may be caused by a password mismatch between the IPC and the PCM. Both this DTC and PCM DTC 1631 will be set in this case. Refer to IPC Programming Following Replacement in this section and perform the procedure.

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Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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You have the 2016 and 2255 codes, the 2255 is current, try disconnecting the battery for a minute and see if these codes come back, they might be false codes. Also as someone noted make sure you have a good battery.

INFO. ON FALSE CLASS 2 SERIAL DATA DIAGNOSTIC TROUBLE CODES #63-12-11 - (Aug 5, 1996)

SUBJECT: INFORMATION ON FALSE CLASS 2 SERIAL DATA DIAGNOSTIC TROUBLE CODES (DTCS) SET BY THE A/C PROGRAMMER

MODELS: 1996 CADILLAC CONCOURS, DEVILLE, ELDORADO, SEVILLE

SOME OF THE ABOVE LISTED VEHICLES MAY EXPERIENCE THE SETTING OF FALSE CLASS 2 SERIAL DATA DIAGNOSTIC TROUBLE CODES (DTCS) BEING SET BY THE A/C PROGRAMMER (ACM). A FALSE CLASS 2 SERIAL DATA CODE IS A FOUR DIGIT CODE THAT BEGINS WITH THE NUMBER 2. THIS CAN BE ANY DTC OTHER THAN 2016, 2064, 2096, 2153 AND 2255.

THESE DTCS WILL NOT TURN ON THE MIL LAMP OR DISPLAY A MESSAGE ON THE DRIVER INFORMATION CENTER (DIC). THESE FALSE DTCS ARE DISCOVERED WHEN THE SERVICE TECHNICIAN ENTERS ON-BOARD DIAGNOSTICS AND VIEWS ACM DTCS. THE SETTING OF THESE FALSE CODES WILL NOT AFFECT ANY OPERATION OF THE VEHICLE. THE FALSE DTC IS CLEARED WHEN THE BATTERY IS MOMENTARILY DISCONNECTED. THESE DTCS WILL NOT RETURN AFTER THE CODE HAS BEEN CLEARED BY A BATTERY DISCONNECT

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Cheers for all the help so far I just thought I would let ya all know that I wont be able to do anything suggested until the weekend as my work as taken over a bit and need to catch up :huh: ...I Will post any new findings on Saturday

And once again Thank you all.

Andy

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Herer is some more info

Engine Cranks but Does Not Run

Circuit Description

The ignition system uses a waste spark method of spark distribution. During cranking, the Ignition Control (IC) module monitors the crankshaft position sensor signals. The signals are used to determine the correct pair to spark first. After the crankshaft position signals have been processed by the IC module, it sends a fuel control reference pulse to the PCM. When the PCM receives this pulse it will command all eight injectors to open for a priming shot of fuel in all cylinders. After priming, the injectors are left OFF for the next eight fuel control reference pulses from the IC module (two crankshaft revolutions). This allows each cylinder a chance to use the fuel from the priming shot. During this waiting period, a cam pulse will have been received by the PCM. Now the PCM begins to operate the injectors sequentially based on true crankshaft position. However, if the cam signal is not present at start-up, DTC P0340 will set and the PCM will start fuel delivery in a random pattern with a 1 in 8 chance that fuel delivery is correct.

The crankshaft position sensor signals are used only by the IC module. It is used for spark synchronization and to initiate reference pulses only (not passed to the PCM).

Diagnostic Aids

Perform the A Powertrain On Board Diagnostic (OBD) System Check before performing this chart to help prevent mis-diagnosis.

Here is the diagnosis tree, save this to your computer and view it, I couldnt get it any bigger

CranksButDoesntStart.jpg

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Cheers for all the advice and suggestions But Have finally admitted defeat and spoke with my local garage who are going to get there auto electrician to have a look at it.

All the advice has helped to narrow the field on whats wrong so with any luck It will save him some time.... Again Many thanks to all for your time in looking things up and taking the time to post your findings :hatsoff::) I will let ya all know what he finds out

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So far he has said He thinks 95% sure its the ECU? is dead

But I'm waiting for 100% confirmation on it as he was still testing stuff

He's 99% sure its NOT the VATS causing it???.

Update on the Update lol

He cleared all the codes and tried to start the car and the only code thats coming up now is P0603 which is Control Module Long Term Memory Reset ?? according to the info Jims_97_ETC psychoanalyzed for me on Page 1,,,, So does that mean that my car has forgot what its meant to be doing??? Or does it need a new ECU?

Edited by Andy G
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P0603 means that the battery has been disconnected sometime in the last six months. It's there as a code only to notify the tech that the alwasy-hot voltage on the PCM has dropped below the level necessary to keep the RAM alive.

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Andy, see alvarado's thread, I posted a lot of info over on his thread that may be helpful to you, Mike

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Had a message from the garage They have had it running :hatsoff:

The diagnostics is way above my head but this is whats been done (Apparently where the Clifford alarm was spliced into the wiring loom there is a resistor that gets put in to bypass the factory immobilizer apparently :huh: This resistor had overheated and died or something along those lines. So he has sorted out the the bad/cut wiring and removed the resistor and it started he Just wants to run a few more checks tomorrow to double check that was all it was and not a loose/broken wire that got moved while playing with the wiring.

Many thanks for all the help and advice :hatsoff::grouphug:

will defiantly confirm if its sorted Subject to tomorrows (Saturdays) Testings :D

Edited by Andy G
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Too bad you never mentioned (till now)...that it had an AFTERMARKET ALARM on it...

That would have been the absolute first thing to check...

Anyway... glad you got it going...

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WOW, I WISH we knew about the aftermarket alarm!!! We ALWAYS recommend removing them they create big problems. We also find a lot of problems with the REMOTE START devices....

Glad you got it running, now we need to see if the OTHER member here that can't start has an AFTERMARKET alarm.

Keep us up to date

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Well we are just glad you solved the problem!

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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