BlownCorona Posted August 12, 2020 Share Posted August 12, 2020 Hello OS collective, I once again have underestimated something. i got my modified driveshaft back today, and as per usual, only yesterday decided id see if the engine would want to start after the manual swap. inevitably, it did not, No problem i thought, probably just needs the ecu to be told its in park, as none of the gear position lights had lit up. Today i went over the auto trans with a multi meter and found what pins were connected when in park. jammed some paperclips in the corresponding plugs and had "P" show up on the dash. still no cranking. doesnt sound like the fuel pump primes, but i cant remember if i could hear this before or not. i dont hear the starter relay click, but the radio ect does turn off when i turn the key to start. Does anyone know what needs to be done to get a 1ggze to start after the auto has been removed? cheers! Quote Link to comment Share on other sites More sharing options...
Benno Posted August 12, 2020 Share Posted August 12, 2020 I know nothing about 1Gs, but are you sure your battery is charged? The radio is not wired to turn off when you use the starter, the voltage drop from the starter motor load causes the voltage to 'brown out', dropping so low the radio will switch off. Sounds a bit like the when you go to crank there is not enough charge in the battery to provide enough current for the starter to crank, but the voltage will drop enough to turn the radio off. Check the battery voltage, perhaps stick it onto the charger. 1 Quote Link to comment Share on other sites More sharing options...
mjrstar Posted August 13, 2020 Share Posted August 13, 2020 There only looks to be the inhibit switch (probably a separate position switch that was on the selector mechanism) and a 7.5a fuse in the start / crank circuit. There is also the main efi relay for the likes of energising the ecu and fuel pumps etc.. But it should crank (but not fire) without this main relay energised. 1 Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted August 13, 2020 Author Share Posted August 13, 2020 ive had it hooked up to a grunty (will start 5.7 hemi dodge ram with no battery fitted) jump starter. but i dont even hear the starter relay click when i turn the key. are you sure the acc circuit gets power when the key is turned to start? ive even left the auto shifter pluged in, perhaps just that 7.5a fuse has blown. ill double check the wiring around the shifter though Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted August 13, 2020 Author Share Posted August 13, 2020 also - ignore that last diagram, that apears to be just a bare bones wireup of an ra28 Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted August 13, 2020 Author Share Posted August 13, 2020 have discovered that "neutral start switch" is the big electrical box on the side of the trans. that the shifter runs through, im pretty certain i have the switch bypassed. as per usual my ill have to check the 7.5a fuse isnt blown, wish i could find the fuse box lid! still keen on input. cheers Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted August 13, 2020 Author Share Posted August 13, 2020 Appears I have the correct pins jumped, good to know about the reverse lights in above pic. Starting to consider something else is wrong or has been unplugged/bumped during the swap. Quote Link to comment Share on other sites More sharing options...
shrike Posted August 13, 2020 Share Posted August 13, 2020 Stupid question but is the startermotor connected/wired up correctly? many years ago I swapped starter motors on my skyline to discover I had connected the signal wire to the wrong tab Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted August 13, 2020 Author Share Posted August 13, 2020 funny you say that - was heading here to give that exact piece if info/clue thought id cracked the case at lunch today when i checked and the signal wire wasn't connected. (i didn't remove the starter, just pushed it out of the way so it must have gotten dislodged) but nope. still exactly the same. took a multi meter to the sense wire and its not getting 12v when trying to start. Quote Link to comment Share on other sites More sharing options...
AllTorque Posted August 13, 2020 Share Posted August 13, 2020 At the neutral safety switch, do you have 12v at one of the pins when the key is at the start position? the wiring diagrams above, start signal is going to the ecu, But I cannot see output to the starter trigger. Is there a direct wire from the ignition switch or does the ecu control the start relay? At the start relay, do you have constant 12v at one pin and a signal 12v when key at start? Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted August 13, 2020 Author Share Posted August 13, 2020 I will check all that on monday or potentially during the weekend, the cars stored at work unfortunately. I found pictures of the neutral start switch disassembled, and all that it does is bridge to wires in park and neutral. As expected. But also as I've bridged. Admittedly it's only bridged with a paperclip so I'll also make a proper bridge, but there's no reason the clip shouldn't work, as it is working for bridging the dash indicator lights. I don't think the indicator lights talk to the ecu though. Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted August 14, 2020 Author Share Posted August 14, 2020 youre right, i cant see what the starter is wired in on the above diagrams at all. it must be related to the NSW or else it would start in any gear with the auto it also looks to be that if the AFM wasn't plugged in, the circuit opening relay wouldn't operate. something else ill double check i plugged in/is seated correctly. i definitely removed this for another reason Quote Link to comment Share on other sites More sharing options...
tim13 Posted August 15, 2020 Share Posted August 15, 2020 18 hours ago, BlownCorona said: youre right, i cant see what the starter is wired in on the above diagrams at all. it must be related to the NSW or else it would start in any gear with the auto it also looks to be that if the AFM wasn't plugged in, the circuit opening relay wouldn't operate. something else ill double check i plugged in/is seated correctly. i definitely removed this for another reason Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted August 17, 2020 Author Share Posted August 17, 2020 It was the 7.5a fuse. finally tracked down my fuse box lid with the diagram on it, and although i had checked all the fuses. it was located in a separate stack of fuses that i thought were spares.... dumbass. runs good now! 7 1 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.