Subject	CAS provides the ECU with the timing signal to fire the
Posted by	jzack on October 23, 2012 at 9:22 AM
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In Reply To	Re: PTU drives the coil packs - get's it firing signal from posted by Medallion Man on October 23, 2012 at 06:32 AM
Message	coils and injectors. CAS gets driven via timing belt as it drives the engine's overhead cams. CAS mechanically attaches to one of the cams. The ECU in turn reads the CAS timing signal and tells the injectors and coils to do their thing. Electronically the ECU CAN connect directly to the injectors since injectors (electrically) have pretty low power consumption requirements. The coils however are a whole other thing (at least for late '80s technology) and the ECU needs a little help firing them. The PTU is just a high powered driver (switch) that allows the ECU to send a low power signal in and the PTU takes that signal and conditions it for the higher current (power) required by the coil packs. So if the PTU is getting the ECU (in) signal but the coil pack isn't firing -- could be a PTU issue. If the PTU is NOT getting an ECU signal - then either the wiring or the ECU is the issue...
Follow Ups	Number 1 CYLINDER - ZTom 17:17:12 10/22/12 Did things work well before the harness swap? If so, - jzack 18:15:29 10/22/12 Re: Did things work well before the harness swap? If so, - ZTom 19:15:28 10/22/12 PTU drives the coil packs - get's it firing signal from - jzack 19:26:54 10/22/12 Re: PTU drives the coil packs - get's it firing signal from - Medallion Man 06:32:56 10/23/12 CAS provides the ECU with the timing signal to fire the - jzack 09:22:58 10/23/12 PS - Just throwing this out there but since you have a - jzack 09:34:46 10/23/12 Re: PS - Just throwing this out there but since you have a - ZTom 11:08:14 10/23/12 This diagram should help - the online Z32 factory manual - jzack 12:56:48 10/23/12 Re: CAS provides the ECU with the timing signal to fire the - ZTom 21:17:29 10/23/12 sounds to me like your PTU is fried - Zvil 07:13:28 10/23/12 Test everything as shown in the FSM, make sure he coils have - Supermario680 (WI) 15:04:35 10/23/12 And its possible, but I would think unlikely. Grab a meter - Supermario680 (WI) 15:07:17 10/23/12 Re: And its possible, but I would think unlikely. Grab a meter - ZTom 10:41:15 10/24/12
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