Ive just changed my old S1 ptu over to a S/H S2 ptu but upon start up theres no spark. Wiring and connections are as per plan and the battery was disconnected during the entire replacement. If anyone has any ideas what the cause of this could be, help would be appreciated. Alternatively if you're bored and live in south brisbane and feel like dropping in for a looksee, gimme a call on 0438 171 447 haha Cheers Phill
Did you use the adapter harness or hardwire it? Check the plugs that the little connectors haven't pushed through and aren't making a solid connection. It's somewhat common with the S2 PTU's.
Used the adapter harness (Connectors) and spliced in the old wires to new connector wires. Theres no corrosion and the pins havent been pushed through. We check the connection from one sides of the S2 ptu to the other with a multimeter and its all fine.
There is one wire that has to be brought from one side to the other, but there is 2 of the same colour. Did you extra check that everything was right? And is there any error codes? Maybe it's something else.
like chrispy said. There are 2 wires the same colour- BLACK One is for earth, the other is the output signal wire to Cylinder 1 Coilpack. There should be an loop in a black wire, protruding from the loom, not too far from the PTU itself. This is the output wire for Cylinder 1 Coilpack, for connection of a timing light. Peel back the insulation on your wiring loom to make sure that you have the correct configuration on your black wires. Would swing by, but my PTU is soldered in (didn't come with adaptors from the seller)...... and I'm a few rum cans beyond driving condition.
Phill, this may help... Start reading here: http://www.aus300zx.com/forum/showpost.php?p=634032&postcount=7 From here:http://www.aus300zx.com/forum/showthread.php?t=264703&highlight=series+wiring
Wiring diagram is great but I have had at least three S2 PTU hardwires where the wiring colours on the suppliied pigtails that have been different to the diagram or even the factory loom. I don't know how this is possiblle but I know for a fact they are. I use a S1 - S2 harness adapter loom as the template. I also test the S2 PTU by using the harness adapter plugged in before cutting any wires as I have been caught before with a brand new S2 PTU with a dead circuit With the faultless reputation of S2 PTU's (especially brand new) I though I had incorrectly rewired... luckily a continuity test of the PTU revealed and i had a spare S2 PTU to offer. I have this harness adapter here in Bris if anyone wants to borrow. If you don't use the adapter it is good practice to line everything up then label the loom wires, then double check your work before cutting. The earth wire relocation from one side to the other can catch you out otherwise.
Ive checked and double checked all the wires are theyre correct as far as I can see. I dont have any way of checking the error codes unfortunately. If anyones bored today and wants to drop round, you're more than welcome
hey mate, i had the same issue But i only discon recon my S2PTU....it wouldnt start after that. So i checked out my ecu and i discon recon the Harness Plug on the ECU.....then all was sweet....Mabey a different issue than yourse but thort it share that incase it helps
Know someone else close with a Z32? Make sure the PTU is ok by swapping over with them. Should only take 10 minutes to check.
Solved! So the main problem turned out to be a dodgey CAS connection, the plug was loose and corroded. To add to that, the S2 PTU was wired up incorrectly and the spark plugs were fouled. Thanks to some handy work from zed4life, the Crank Angle Sensor was reconnected properly. The PTU was rewired correctly and the spark plugs cleaned. Alls well thats ends well
Yes a classic scenario of 4 consecutive problems. Great fun!!! First task was an ECU diagnostic showing a dodgy CAS connector as the primary culprit. Fixed that - still no-start so investigated the new PTU. As part of troubleshooting Phil had recently bought a S2 PTU and had a friend wire it up (unfortunately it was wired in backwards and getting extremely hot - yet miraculously it this didn't kill the PTU or the zed !!!). Fortunately I had a S1 <>S2 wiring adapter harness (thanks to heavytrevy) to use as a template and rewired the S2. Without this harness as a guide, it's easy to miss the earth wire crossover from the middle of one plug to the end pin on the opposite plug. With the original loom having already been cut, discerning wire colours was 'interesting'. Phil's 'as-new' eyeball (private joke) helped confirm the colour variances in the poor light and a cross-check of continuity between a few of the PTU plug terminals <> the coilpacks just to be sure. Next, the plugs were fuel-fouled from trying to start with no ignition. Battery was also flat (<8V while cranking so the ECU flatly refused to play along) Cleaned the front four plugs which was enough to carry the rear two along when restarting. Charged the battery. Initial fire up showed the rear 2 plugs were also fouled but a couple revs cleaned them all out. Also had a loose terminal in the S2 PTU plug which we eventually secured. So was a tricky but satisfying one. The 1st PTU wire-in caused a separate problem (to the initial CAS plug issue) and in turn caused the fouled plugs and flat battery. Always pays to check the ECU diagnostics 1st so as to fix the primary problem first. Anyway, end result is Phil has eliminated the old S1 PTU as a possible cause of future problems so worth the effort in the end.:zlove:
