Mazda GTX Posted May 19, 2020 Report Share Posted May 19, 2020 Hello, Car won't start on G4X (on stock ECU starts instantly, flawless), Fuel pump, injectors 1&2 work, spark works. When cranking it gives a trigger error (I have tried bunch of trigger settings none where able to start engine) -Distributor faulty. no TPS connected ( I have 4 wire TPS (my older GT have 3 wire sensor), where unable to find connected input for ECU) -TPS faulty. Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 19, 2020 Author Report Share Posted May 19, 2020 4 wire TPS Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 19, 2020 Report Share Posted May 19, 2020 attach the triggerscope file and your tune. Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 19, 2020 Author Report Share Posted May 19, 2020 http://www.seif.area.lv/LINKG4X/GTXtest.pclx http://www.seif.area.lv/LINKG4X/triggerscope.llgx Quote Link to comment Share on other sites More sharing options...
Vaughan Posted May 19, 2020 Report Share Posted May 19, 2020 That doesn't look like an mx5 pattern looking at the triggerscope, are you sure your trigger wiring is correct as the mx5 pattern is a 4 Cam Trig1 and 2 Cam Trig 2 pattern Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 19, 2020 Report Share Posted May 19, 2020 I reckon trig 1 probably looks correct, just no signal on trig 2. Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 19, 2020 Report Share Posted May 19, 2020 TP sensor: LG/W is the signal, this should go to ECU pin 7. BR/B is ground. LG/R is 5V, this should go to ECU pin 8. R/W is not needed for the Link ECU. So first check you have 5V when measured between BR/B & LG/R. Then confirm you have a voltage that varies with TP movement coming out of the LG/W wire. Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 20, 2020 Author Report Share Posted May 20, 2020 TPS Sensor is faulty, Thank You for pin-out. Still car should start without it, so far I get only gasoline smell from it, no spark. If both triggers are set to hall/optical, 1.(trigger 2 pull-up is on.) 2. (trigger 2 pull-up off.) I get some gasoline smell and one single spark. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted May 20, 2020 Report Share Posted May 20, 2020 your trigger 2 is wrong and it won't start and run until it sees the correct pattern, should look like this. Both trigger pullups should be on Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 21, 2020 Author Report Share Posted May 21, 2020 Can't get trigger 2 to post correct, If both triggers set to reluctor, then I get this graph, does it means trigger 2 is connected right way: Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 21, 2020 Report Share Posted May 21, 2020 No those spikes are just a ground offset from the starter motor kick back or something. You have no trigger 2 signal, either the CAS is faulty or the wiring between the CAS and ECU is broken. CAS pinout below. You can check the CAS is ok by pulling it out and backprobing the trigger 2 pin with a paperclip or similar then watch the voltage while turning it by hand. It should jump between 0 & 5V a couple of times per rev. If that looks ok then you can do the same test at the ECU pin 10 to check the signal makes it to the ecu. Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 21, 2020 Author Report Share Posted May 21, 2020 Distributor where faulty, replaced distributor and engine still won't start, if cranking for a while it starts burp, should it start with mx-5 maps ? What else I might be missing ? http://www.seif.area.lv/LINKG4X/GTX burp burp.pclx http://www.seif.area.lv/LINKG4X/GTXtest.pclx Quote Link to comment Share on other sites More sharing options...
Vaughan Posted May 21, 2020 Report Share Posted May 21, 2020 have you calibrated the timing? Triggers -> Calibrate -> Set Base Timing crank engine with a timing light attached and adjust the offset value until the angle measured with the timing light matches the angle the ignition is locked to. Also might be worth increasing the master fuel number a little if it still doesn't start once you've calibrated the ignition. Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 22, 2020 Author Report Share Posted May 22, 2020 Timing light do not light up when cranking. On stock ECU car starts. There are some trigger errors while cranking... - Ignition test, Injector test, fuel pump test, works. Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 22, 2020 Report Share Posted May 22, 2020 Can you try to give us a photo of the CAS wheel inside the distributor (i dont even know if it is visible), the trigger pattern in your triggerscope above doesnt match the normal MX5 NA/BP pattern. These normally have 4 trig 1 teeth for every 2 trig 2 teeth, but yours seems to have 4 trig 1 teeth for every 1 trig 2 teeth. Normal BP pattern is shown on the bottom of the pic below where it says "NA". Is it possible someone has cut one of the trigger 2 teeth off your CAS? I think we should still be able to make it work, I just want to confirm how many teeth you have on each wheel before making a suggestion. Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 22, 2020 Author Report Share Posted May 22, 2020 This is faulty distributor picture, can You give a setting to try, before taking apart functional one. Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 22, 2020 Report Share Posted May 22, 2020 Try this: Mazda GTX 1 Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 22, 2020 Author Report Share Posted May 22, 2020 Still no spark while cranking, gasoline smell and it shoots one spark at the end after key is on off sometimes. Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 22, 2020 Report Share Posted May 22, 2020 Are you getting valid RPM and no trigger errors now when cranking? Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 22, 2020 Author Report Share Posted May 22, 2020 seems it gets valid RPM but some trigger errors Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 22, 2020 Report Share Posted May 22, 2020 Can you save one of those triggerscope captures and attach here. Im just about to go out now so wont be able to help much more until later in the day. Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 22, 2020 Author Report Share Posted May 22, 2020 triggerscope3.llgx TriggerScopeLog4.llgx TriggerScopeLog5.llgx Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 23, 2020 Report Share Posted May 23, 2020 The trigger looks ok to me I think. Can you do us a short PC log of it cranking, and attach a copy of your latest tune too. Are you checking for spark going in to the distributor or coming out? Quote Link to comment Share on other sites More sharing options...
Mazda GTX Posted May 23, 2020 Author Report Share Posted May 23, 2020 Some sparks are going in to distributor. seif.area.lv/LINKG4X/GTX latest.pclx Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 23, 2020 Report Share Posted May 23, 2020 Can you attach the actual log and the tune. If there are sparks at the coil lead but not coming out of the distributor then that would suggest the rotor is not pointing at a post when a spark occurs - try shifting the trigger offset by about 45 degs at a time to see if you get a spark. Quote Link to comment Share on other sites More sharing options...
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