daddydonuts Posted March 28, 2013 Share Posted March 28, 2013 I did all of the electrical test from the FSM on the computer and it failed the 26 or 27 pin test (can't remember), but the FSM says replace the computer. Also, I had to hard wire my fuel pump to an accessory switch and it works but not with the factory wires. Is my problem the ECU? thanks in advance! Quote Link to comment Share on other sites More sharing options...
cgsheen Posted March 28, 2013 Share Posted March 28, 2013 (edited) Which? Pin 26 on the ECU goes to the AFM and the CHTS (cylinder head temp sensor). Pin 27 is the "turn me on" voltage from the EFI relay. It (the ECU) gets voltage from the EFI relay to pin 27 and 35 at IGN ON? It has a constant voltage to pin 114 (and the injectors)? The GND's are correct (multitude of pins... refer to the FSM)? The green light comes on or not? Edited March 28, 2013 by cgsheen Quote Link to comment Share on other sites More sharing options...
daddydonuts Posted March 28, 2013 Author Share Posted March 28, 2013 Which? Pin 26 on the ECU goes to the AFM and the CHTS (cylinder head temp sensor). Pin 27 is the "turn me on" voltage from the EFI relay. It (the ECU) gets voltage from the EFI relay to pin 27 and 35 at IGN ON? It has a constant voltage to pin 114 (and the injectors)? The GND's are correct (multitude of pins... refer to the FSM)? The green light comes on or not? 27 then, it failed that test, plus my fuel pump pin test...I get voltage at the coil, and none on the plugs... to me, if I'm correct, the ECU is the problem. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted March 28, 2013 Share Posted March 28, 2013 I got one you can try. I'm near Atlanta. Quote Link to comment Share on other sites More sharing options...
daddydonuts Posted March 28, 2013 Author Share Posted March 28, 2013 (edited) I got one you can try. I'm near Atlanta. I'm at Benning, how much? Edited March 28, 2013 by daddydonuts Quote Link to comment Share on other sites More sharing options...
cgsheen Posted March 28, 2013 Share Posted March 28, 2013 27 then, it failed that test, plus my fuel pump pin test...I get voltage at the coil, and none on the plugs... to me, if I'm correct, the ECU is the problem. I don't think you've provided enough information for anyone here to actually determine: "to me, if I'm correct, the ECU is the problem." "27 then, It failed that test" - Meaning? - Does it read battery voltage on ECU pin 27 when you turn the ignition switch to ON? - Does it read battery voltage on ECU pin 35 when you turn the ignition switch to ON? - Does ECU pin 114 have constant battery voltage? - Every GND connection (ECU pins 107,109, 112, 113, 36, 28) is properly connected to only GND? - Does the green LED inside the ECU case come on when you turn the ignition switch to ON? ( there is a hole on one side of the case from which the LED should be visable) "plus my fuel pump pin test..." - Well, if all the above is TRUE, and all the voltage and GND tests are normal, AND you get no green LED light from the ECU, then go no further. You won't get the fuel pump signal for ~5 seconds at IGN ON. The ECU controls the fuel pump so if the ECU doesn't "come to life" neither will the fuel pump. Quote Link to comment Share on other sites More sharing options...
daddydonuts Posted March 28, 2013 Author Share Posted March 28, 2013 I don't think you've provided enough information for anyone here to actually determine: "to me, if I'm correct, the ECU is the problem." "27 then, It failed that test" - Meaning? - Does it read battery voltage on ECU pin 27 when you turn the ignition switch to ON? - Does it read battery voltage on ECU pin 35 when you turn the ignition switch to ON? - Does ECU pin 114 have constant battery voltage? - Every GND connection (ECU pins 107,109, 112, 113, 36, 28) is properly connected to only GND? - Does the green LED inside the ECU case come on when you turn the ignition switch to ON? ( there is a hole on one side of the case from which the LED should be visable) "plus my fuel pump pin test..." - Well, if all the above is TRUE, and all the voltage and GND tests are normal, AND you get no green LED light from the ECU, then go no further. You won't get the fuel pump signal for ~5 seconds at IGN ON. The ECU controls the fuel pump so if the ECU doesn't "come to life" neither will the fuel pump. If this test fails FSM says replace control unit, see the consecutive FSM pages below. My fuel pump works when I hard wired it from an accessory switch... Quote Link to comment Share on other sites More sharing options...
cgsheen Posted March 29, 2013 Share Posted March 29, 2013 Ouch... Your topic title says "83 Stock Turbo". The pages you show are for the EFI 280ZX. You should be in the ECCS Section of the FSM if you have a turbo model (280ZX Turbo)! And that's the pinout I have been refering to - the ECCS ECU. The N/A car is also fuel injected but it has a completely different computer (ECU) and engine management system than the Turbo! "EFI" is for the normally asperated engine. "ECCS" is for the turbocharged engine. If your ECU connector looks like the pictures you posted, the harness is from the EFI (N/A) version and can't be used to run the stock turbo engine. The ECCS (turbo) ECU has 3 seperate plugs (black plastic) that go into the side of the ECU, not a single long plug like the EFI ECU... Quote Link to comment Share on other sites More sharing options...
daddydonuts Posted March 29, 2013 Author Share Posted March 29, 2013 Ouch... Your topic title says "83 Stock Turbo". The pages you show are for the EFI 280ZX. You should be in the ECCS Section of the FSM if you have a turbo model (280ZX Turbo)! And that's the pinout I have been refering to - the ECCS ECU. The N/A car is also fuel injected but it has a completely different computer (ECU) and engine management system than the Turbo! "EFI" is for the normally asperated engine. "ECCS" is for the turbocharged engine. If your ECU connector looks like the pictures you posted, the harness is from the EFI (N/A) version and can't be used to run the stock turbo engine. The ECCS (turbo) ECU has 3 seperate plugs (black plastic) that go into the side of the ECU, not a single long plug like the EFI ECU... Dang it Quote Link to comment Share on other sites More sharing options...
daddydonuts Posted March 29, 2013 Author Share Posted March 29, 2013 (edited) I'm selling the car, but I just want to get it running...fuel pump still does not work on the stock wires, only after I ran wires directly to it, did that make it work. I know there is something on the ignition system that makes the fuel pump cut on when the engine demands more fuel. Edited March 29, 2013 by daddydonuts Quote Link to comment Share on other sites More sharing options...
Domzs Posted March 29, 2013 Share Posted March 29, 2013 83 turbo has a fuel pump control module , have you looked there ? Left kick panel area . Quote Link to comment Share on other sites More sharing options...
daddydonuts Posted March 30, 2013 Author Share Posted March 30, 2013 83 turbo has a fuel pump control module , have you looked there ? Left kick panel area . Yes, I have pulled it out. Read above ^ I was looking at the wrong part of the manual, I will have to restart my progress later this weekend...and figure this out. Quote Link to comment Share on other sites More sharing options...
daddydonuts Posted April 2, 2013 Author Share Posted April 2, 2013 (edited) Got an ECU today from skirkland1980, connected the harness, hooked up the battery...and wham bam..it fired up! But only for a few seconds and it stumbled out and died...I looked at all of the vacuum lines and made sure they were connected, don't know where to look now... any suggestions??? Edited April 2, 2013 by daddydonuts Quote Link to comment Share on other sites More sharing options...
Domzs Posted April 2, 2013 Share Posted April 2, 2013 Will it restart after it stalled ? Quote Link to comment Share on other sites More sharing options...
daddydonuts Posted April 2, 2013 Author Share Posted April 2, 2013 (edited) Will it restart after it stalled ? No, getting ready to FSM the hell out of this mutha though Edited April 3, 2013 by daddydonuts Quote Link to comment Share on other sites More sharing options...
Domzs Posted April 3, 2013 Share Posted April 3, 2013 Ok , what's missing ? Fuel or spark ? Have you tried to start it with carb spray or starting fluid to see if it runs ? Quote Link to comment Share on other sites More sharing options...
daddydonuts Posted April 3, 2013 Author Share Posted April 3, 2013 Ok , what's missing ? Fuel or spark ? Have you tried to start it with carb spray or starting fluid to see if it runs ? No, but I passed everything in the FSM until this: I started @page 95 or 96, where ever the eccs test start. I will be able to determine spark after tomorrow when I get home. I am very certain it is the fuel pump control (see above issues) since that is tied in with the CAS. Quote Link to comment Share on other sites More sharing options...
daddydonuts Posted April 4, 2013 Author Share Posted April 4, 2013 Update, I completed all the checks in the FSM. Fuel pump works only (when hooked up to a power source), ECU pin test passed, fuel pump control passed, replaced fuel pukp relay and passed, but fuel pump does not work with stock wiring. Engine will run while spraying starter fluid in the AFM. besides running the wires down for the fuel pump to check for damage, what should I be looking for now to get my fuel pump working? Quote Link to comment Share on other sites More sharing options...
cgsheen Posted April 6, 2013 Share Posted April 6, 2013 The wiring between the fuel pump relay and the fuel pump. Run a new "hot" wire from the relay to the fuel pump and see how that works. You've already checked to see if the pump has a proper GND, haven't you? Then you can decide whether to leave it, or tear into the body harness and find the source of the problem. Do you have trouble with any other electrical items in the back of the car? (wondering if you have some shorted, melted, wires in the bundle...) Oh, I've always meant to ask if you have a stock 1983 280ZX Turbo or if we're dealing with an engine swap... Quote Link to comment Share on other sites More sharing options...
Domzs Posted April 6, 2013 Share Posted April 6, 2013 I had the same problem , turned out to be a bad computer . If there's no voltage at the pump wire and fuel mod tested good , i would check fuel pump wires for open ckt ( cut wires ) . Quote Link to comment Share on other sites More sharing options...
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