got a call from a mate who has had his z sitting for a while picked it up drove it from newcastle to gosford drove the next day started to miss then would not start so two years later he calls me to check it out time is slow on the central coast. pluged in consult it threw up the following code 13 temp sencor code 21 ingnition signal curcit mas air 0.48v thrtl pos 0.44v 02 sencor 0.00v inj pulse 20.00 msec iacv-aac/v 0% i think it may be the ptu any input would be helpfull as he would like to get it running or if to expensive may well be acheap TT 2seater going.
code 21 ingnition signal curcit swap the ptu for a known working one, after you've checked the connection. Code 21 dose not point to the ptu directly, it means there's break in the ignition circuit, the ptu is only one (important) part off that circuit, the series 1 ptu does fail, or has been known to fail after 15-20 years.
tested the coil connecters and got 12v at each also cleaned ptu connectors + all others cleaned ptu connecters checked ign relay could it be a fuse
2nded each coilpack gets 12V and an earth signal but the most important is the signal from the PTU to the left hand pin on the coilpack. Here's a tech article on this.
