H22A with P30/ some questions

shiggy · Post by **shiggy** » Wed Apr 11, 2007 8:13 am

Hi there,

my customer is gonna tune their car, JDM BB6 prelude H22A using P30 ECU.

They now have some issue:
1. secondary intake runner won't work
2. knock level shows obviously low reading

1. secondary intake runner
They set secondary intake runner working around 5500rpm, though
the solenoid didn't work. (both with normal/inverted output)
They checked wiring and Datalog shows ON of IAB output actually, but
no voltage came to the solenoid.

They also tried to use AUX output for IAB instead of normal IAB operation.
They set Nitrous#1 as follows to let ECU turn IAB on after 3000rpm:

Function: Generic output
Arming imput: always ON
Output: A17 IAB (with relay) inverted output
condition: 0-3000RPM, 0-120kPa, 0% throttle, 0km/h, -3 IAT, -37~130 ECT

However, this setup didn't work...

2. low knock voltage
Even a new sensor and knock sensor enabled, knock level only shows 0-0.2V.
This seems quite low, wiring seems ok...

Please advise

Post by **Spunkster** » Wed Apr 11, 2007 9:49 am

The P30 does not have IAB control. If you use the aux options you must use an output that the JDM P30 actually has.

As for the Knock control, You cannot go by voltage, you must just look throught the datalogs and see if it is actually retarding the timing. if it does, then you have knock and ned to remove some timing in that area.

shiggy · Post by **shiggy** » Wed Apr 11, 2007 10:04 am

Okay I see...

So... vise versa, which ECU has IAB control?
They would use the ECU which has IAB output and Barometric pressure sensor...
I thought JDM P30 doesn't have baro press sensor too, right?

Then I thought S series ECU can show knock voltage as well as K series...
You mean that knock sensor is working when ECU retards timing
(even the voltage is not moving)?

Thanks

Post by **Spunkster** » Wed Apr 11, 2007 1:56 pm

There is a list at http://www.hondata.com/ecus.html.

The knock control is very different between the 2 systems. There are different knock boards for OBD1 ecus' that are tuned for specific engine sizes and noise frequencies. They are sutup to allow a certain voltage at different rpm points. The only real way to know there is activity is to look at the sensor list and look at the actual knock retard.

shiggy · Post by **shiggy** » Mon Apr 23, 2007 3:31 am

Hi Spunkster,

He is still struggling to use his P30 with Prelude,
he tried other outputs though, AUX output is still not working.

He set imput as always on, then tried to use A12 and A10 as output.
Though these pins outputs nothing...

Post by **Spunkster** » Mon Apr 23, 2007 10:52 am

Some secondaries use a ground to activate them and others use a positive signal. You may have to use a relay to change a ground to a positive signal.

shiggy · Post by **shiggy** » Mon Apr 23, 2007 9:22 pm

Normally that H22A secondary goes to ground when idle to 4000rpm,
then output positive signal to open secondary runner.

He set output as inverted signal and use relay between ECU and solenoid.
He also tried non inverted signal too.
However neither ground nor positive signal comes to the wire.

Anything problem with wiring or parameter settings???

Post by **Spunkster** » Tue Apr 24, 2007 2:10 pm

if you use the FANC output you must use a relay to change the ground into a 12v signal. The invert function just changes the ground from normally being open to normally being closed.

shiggy · Post by **shiggy** » Mon Jun 04, 2007 8:43 am

Hi Spunkster,

I have just told from customer that
Aux output works with some output pins,
Fan control and alternator control.

However A10 pin and IAB is still not working
even with P72 ECU.

Is that normal?
I have sent another unit of S300 to see if it is caused by
faulty unit, though the result was same.

Post by **Spunkster** » Mon Jun 04, 2007 9:43 am

Some IAB's use ground to trigger them, others use power. You will need to determine which this car uses and what your ecu is supplying, then if they are not the same, then you will have to wire it through a relay to get it to work properly.