NoPistons -Mazda Rx7 & Rx8 Rotary Forum

NoPistons -Mazda Rx7 & Rx8 Rotary Forum (https://www.nopistons.com/)
-   2nd Generation Specific (https://www.nopistons.com/2nd-generation-specific-17/)
-   -   All I Want Is A Spark! (https://www.nopistons.com/2nd-generation-specific-17/all-i-want-spark-36541/)

rx7_re 04-01-2004 10:17 PM

Ug, I remember there is a way to see if the ECU is fried. You grab the pressure sensor wires (The ones on the pass. shock tower). You have to test one of the wires in there, I forget which one though. But anyways you test if and it should have 5V on it, if it doesn';t your ECU is toast. Give me a minute to find out which wire it is.

1Revvin7 04-01-2004 10:58 PM


Originally Posted by rx7_re' date='Apr 1 2004, 11:17 PM
Ug, I remember there is a way to see if the ECU is fried. You grab the pressure sensor wires (The ones on the pass. shock tower). You have to test one of the wires in there, I forget which one though. But anyways you test if and it should have 5V on it, if it doesn';t your ECU is toast. Give me a minute to find out which wire it is.

That could just mean your ecu has no power. Test to see if any of the wires going to the ecu are hot while you are at it. If they are at the pressure sensor is not, then its fried.

annuerysm 04-02-2004 08:57 AM

I had already checked that wire on the pressure sensor and it checked out. Is there a good way to check if the leading ignitor trigger wire (the green/yellow striped one) is carrying a signal?

1Revvin7 04-02-2004 11:24 AM


Originally Posted by annuerysm' date='Apr 2 2004, 09:57 AM
I had already checked that wire on the pressure sensor and it checked out. Is there a good way to check if the leading ignitor trigger wire (the green/yellow striped one) is carrying a signal?

Why did this start happening in the 1st place? Do you have x15/16 connectors plugged in? They are up in the corner near the ecu but not plugging into the ecu...

Cosmo Donk 04-02-2004 11:40 AM


Originally Posted by annuerysm' date='Apr 2 2004, 09:57 AM
I had already checked that wire on the pressure sensor and it checked out. Is there a good way to check if the leading ignitor trigger wire (the green/yellow striped one) is carrying a signal?

Well, if my method of triggering it with ground makes it spark the trigger wire should be a pull to ground. If that is correct you should be able to do a continuity check when cranking from the trigger wire to ground. It should beep (continuity) when the signal goes through.



BTW. Did you try my test? - EDIT - I see you did but the coils seemed dead. Have you tried any other coils? - EDIT - Never mind:)

annuerysm 04-02-2004 12:29 PM

1Revvin7: This is happening because I bought the car and it never ran so I rebuilt the motor. I'll check the X15/16 connector sounds promising.



Cosmo Donk: are you sure grounding out the ignitor wire is what triggers the coil? I think the ECU sends 5volts to trip the ignitor based off the CAS signal. Please someone correct me if this is incorrect.

rx7_re 04-02-2004 01:46 PM

I am just curious, are you getting any spark at the trailing coils?

annuerysm 04-02-2004 02:48 PM

No spark on leading or trailing

rx7_re 04-02-2004 03:10 PM

Well, if your sure absolutely everything is connected, I want to say your ECU is fried. I never really hear about coils just crapping out, let alone both of them at the same time.

annuerysm 04-02-2004 03:34 PM

I regrounded the ECU really well and even though my battery now has barely enough power to spin the motor I saw a tiny spark this time. I'm pretty sure it was the ECU not having a good ground.


All times are GMT -5. The time now is 12:52 AM.


© 2024 MH Sub I, LLC dba Internet Brands