Miatapower List Archive

This read-only message was archived from a public mail list.
Mail From: "Vic Harder" <(email redacted)>


Put in the FM ecu... good volts on the temp sensor, and the injectors shut
down properly! Car started, and tuned (at idle) easily. So far so good.

Went to check the knock sensor... tapped it with a screwdriver handle, but
no go. What kind of steps can be taken to troubleshoot this? What exactly
does the ecu "see" in a knock event? I'd like to simulate that and see if
the wiring is ok, or if it is the sensor.

Vic

-----Original Message-----
From: (email redacted)
[mailto:(email redacted)]On Behalf Of Ray Ayala
Sent: Wednesday, April 11, 2001 2:40 PM
Cc: 'Miata Power List (E-mail)'
Subject: Re: Link Installation questions



I haven't tried with a stock ECU, but the odds are good that it would be
the same with a 1.8 ECU and not with a 1.6.

Vic Harder wrote:
>
> Any ecu? Or the FM ecu only? I'm still in testing mode here, and have the
> stock ecu in place
>
> Vic
>
> -----Original Message-----
> From: (email redacted)
> [mailto:(email redacted)]On Behalf Of Ray Ayala
> Sent: Wednesday, April 11, 2001 2:04 PM
> Cc: 'Miata Power List (E-mail)'
> Subject: Re: Link Installation questions
>
> 4) Pin 1M. Without the sensor connected it should be battery voltage
> when the ECU is powered on, but it should drop to half of battery
> voltage when you connect the supplied 680 ohm test resistor from there
> to gnd. With the sensor connected instead of the test resistor, it
> should also be half of battery voltage.
>
> Vic Harder wrote:
> >
> > 1) I did move the ecu end.
> > 2) So, if you have a lousy or no ic the temp comp would be very busy
> indeed!
> > 3) That does sound like a better idea
> > 4) That's what i thought...Will measure the voltage at the ecu next...
> which
> > pin would that be?
> >
> > Thanks for the help!
> >
> > Vic
> > -----Original Message-----
> > From: (email redacted)
> > [mailto:(email redacted)]On Behalf Of Ray Ayala
> > Sent: Wednesday, April 11, 2001 1:26 AM
> > To: Vic Harder; Miata Power List (E-mail)
> > Subject: Re: Link Installation questions
> >
> > 1) You have to move the ECU end of the wire to a different pin.
> > 2) It goes as close to the intake manifold as possible.
> > 3) Solder to the wire underneath the test connector ... it goes to the
> ECU.
> > 4) Yes the ECU supplies the power to the temp sensor. It also controls
> the
> > fuel pump relay through a circuit in the map sensor box, so there may be
a
> > wiring problem there.
> >
> > ----- Original Message -----
> > From: "Vic Harder" <(email redacted)>
> > To: "Miata Power List (E-mail)" <(email redacted)>
> > Cc: "Bill Cardell (E-mail)" <(email redacted)>; "Ken Hill (E-mail)"
> > <(email redacted)>
> > Sent: Tuesday, April 10, 2001 10:10 PM
> > Subject: Link Installation questions
> >
> > >
> > > Just got my FM ECU Mk2 (1.6L)... and have a couple of installation
> > > questions.
> > >
> > > 1) I have no power at all at the blue/white temp sensor connector from
> the
> > > power steering. Any ideas why? I've run without it connected for
some
> > time
> > > now, as I swapped out my PS rack for a manual rack... seems to have
had
> no
> > > ill effect. However, I do have the temp board, so would like to have
it
> > > working.
> > >
> > > 2) Since I am putting this is N/A right now, and into an Autorotor
setup
> > in
> > > a few days, where can i mount the temp sensor? I take it it measure
> > Intake
> > > air temp, before the compressor, so anywhere after the air filter?
> > >
> > > 3) The knock sensor wiring confuses me.... We cut a wire in the map
> sensor
> > > loom and feed the signal from the MAP sensor to the FEN connector in
the
> > > Diagnostic block.. and this gets back to the ECU somehow? Also, the
> > > connection to the diagnostic block seems kinda flakey... since you
can't
> > > close the lid on the diagnostic block with the extra wire in there,
how
> is
> > > one to keep the wire from falling out?
> > >
> > > 4) I didn't do the sequential mod yet. So, i wanted to test 2 things,
> > would
> > > the car start? and does the ECU need to be in place to test for power
on
> > the
> > > temp sensor circuit (question 1). First thing I noticed is that the
> fuel
> > > pump did not cut off after a second or so when the ignition was on.
For
> > the
> > > duration of testing problem #1 i pulled the inj relay. But the car
did
> > > start (with the relay in place). So why does the pump run
continuously
> > > (flooding the engine no doubt)?
> > >
> > > Thanks for the help!
> > >
> > > Vic
> > > 90/92 12psi Autorotor wannabee
> > >
> > >

This read-only message was archived from a public mail list.
Mail From: Bill Cardell <(email redacted)>


Vic,
Your best bet is to go for a drive and watch the window or better yet, do a
log in MLL.

Bill Cardell
(email redacted)
Flyin' Miata
flyinmiata.com
200mphmiata.net
1-800-FLY-MX5S (orders only)
1-970-242-3800 (tech)


-----Original Message-----
From: Vic Harder [mailto:(email redacted)]
Sent: Wednesday, April 11, 2001 10:04 PM
To: 'Ray Ayala'
Cc: 'Miata Power List (E-mail)'
Subject: RE: Link Installation questions - some probs solved!



Put in the FM ecu... good volts on the temp sensor, and the injectors shut
down properly! Car started, and tuned (at idle) easily. So far so good.

Went to check the knock sensor... tapped it with a screwdriver handle, but
no go. What kind of steps can be taken to troubleshoot this? What exactly
does the ecu "see" in a knock event? I'd like to simulate that and see if
the wiring is ok, or if it is the sensor.

Vic

-----Original Message-----
From: (email redacted)
[mailto:(email redacted)]On Behalf Of Ray Ayala
Sent: Wednesday, April 11, 2001 2:40 PM
Cc: 'Miata Power List (E-mail)'
Subject: Re: Link Installation questions



I haven't tried with a stock ECU, but the odds are good that it would be
the same with a 1.8 ECU and not with a 1.6.

Vic Harder wrote:
>
> Any ecu? Or the FM ecu only? I'm still in testing mode here, and have the
> stock ecu in place
>
> Vic
>
> -----Original Message-----
> From: (email redacted)
> [mailto:(email redacted)]On Behalf Of Ray Ayala
> Sent: Wednesday, April 11, 2001 2:04 PM
> Cc: 'Miata Power List (E-mail)'
> Subject: Re: Link Installation questions
>
> 4) Pin 1M. Without the sensor connected it should be battery voltage
> when the ECU is powered on, but it should drop to half of battery
> voltage when you connect the supplied 680 ohm test resistor from there
> to gnd. With the sensor connected instead of the test resistor, it
> should also be half of battery voltage.
>
> Vic Harder wrote:
> >
> > 1) I did move the ecu end.
> > 2) So, if you have a lousy or no ic the temp comp would be very busy
> indeed!
> > 3) That does sound like a better idea
> > 4) That's what i thought...Will measure the voltage at the ecu next...
> which
> > pin would that be?
> >
> > Thanks for the help!
> >
> > Vic
> > -----Original Message-----
> > From: (email redacted)
> > [mailto:(email redacted)]On Behalf Of Ray Ayala
> > Sent: Wednesday, April 11, 2001 1:26 AM
> > To: Vic Harder; Miata Power List (E-mail)
> > Subject: Re: Link Installation questions
> >
> > 1) You have to move the ECU end of the wire to a different pin.
> > 2) It goes as close to the intake manifold as possible.
> > 3) Solder to the wire underneath the test connector ... it goes to the
> ECU.
> > 4) Yes the ECU supplies the power to the temp sensor. It also controls
> the
> > fuel pump relay through a circuit in the map sensor box, so there may be
a
> > wiring problem there.
> >
> > ----- Original Message -----
> > From: "Vic Harder" <(email redacted)>
> > To: "Miata Power List (E-mail)" <(email redacted)>
> > Cc: "Bill Cardell (E-mail)" <(email redacted)>; "Ken Hill (E-mail)"
> > <(email redacted)>
> > Sent: Tuesday, April 10, 2001 10:10 PM
> > Subject: Link Installation questions
> >
> > >
> > > Just got my FM ECU Mk2 (1.6L)... and have a couple of installation
> > > questions.
> > >
> > > 1) I have no power at all at the blue/white temp sensor connector from
> the
> > > power steering. Any ideas why? I've run without it connected for
some
> > time
> > > now, as I swapped out my PS rack for a manual rack... seems to have
had
> no
> > > ill effect. However, I do have the temp board, so would like to have
it
> > > working.
> > >
> > > 2) Since I am putting this is N/A right now, and into an Autorotor
setup
> > in
> > > a few days, where can i mount the temp sensor? I take it it measure
> > Intake
> > > air temp, before the compressor, so anywhere after the air filter?
> > >
> > > 3) The knock sensor wiring confuses me.... We cut a wire in the map
> sensor
> > > loom and feed the signal from the MAP sensor to the FEN connector in
the
> > > Diagnostic block.. and this gets back to the ECU somehow? Also, the
> > > connection to the diagnostic block seems kinda flakey... since you
can't
> > > close the lid on the diagnostic block with the extra wire in there,
how
> is
> > > one to keep the wire from falling out?
> > >
> > > 4) I didn't do the sequential mod yet. So, i wanted to test 2 things,
> > would
> > > the car start? and does the ECU need to be in place to test for power
on
> > the
> > > temp sensor circuit (question 1). First thing I noticed is that the
> fuel
> > > pump did not cut off after a second or so when the ignition was on.
For
> > the
> > > duration of testing problem #1 i pulled the inj relay. But the car
did
> > > start (with the relay in place). So why does the pump run
continuously
> > > (flooding the engine no doubt)?
> > >
> > > Thanks for the help!
> > >
> > > Vic
> > > 90/92 12psi Autorotor wannabee
> > >
> > >