Error 21 vtec spool on P28 ECU

menfou · Post by **menfou** » Sat Mar 10, 2007 8:13 am

Hello,

On a Civic EK4 vti, I have error 21 vtec spool.
if think the vtec works fine, I feel the vtec in the car, but after 600rpm the vtec is off and I have the error 21 vtec spool.

I try with 5000rpm, 6000rpm, and the vtec is ok only during 600rpm, but after the vtec is off.

DipDip · Post by **DipDip** » Sat Mar 10, 2007 9:12 am

I notice two strange value:
- MAP up to 1050 mBar (1377 mBar)
- Vtec cut after 6800 tr/mn

On which engine your S300 ?

Didier

menfou · Post by **menfou** » Sat Mar 10, 2007 9:31 am

Hello,

It's a B16A turbo.
I tuned 2xB16 turbo and 4xB18C turbo and no problem
I used a OBD2a->OBD1 harness conversion
It's a P28 ecu

The vtec works, in this calibration I set the vtec to 6000rpm, but after 600-700rpm, the vtec is off and I have a Error 21 vtec spool.

DipDip · Post by **DipDip** » Sat Mar 10, 2007 9:45 am

Turbo with stock MAP sensor ?

MSN, si tu veux, car plus pratique.

PS (MSN) : dip_itr@hotmail.fr

Post by **Hondata** » Mon Mar 12, 2007 10:29 am

When the ECU switches on the VTEC it has a voltage feedback circuit to check the spool valve is working. The fault is likely to be with the ECU, or one of the wiring connectors has high resistance.

menfou · Post by **menfou** » Tue Mar 13, 2007 5:38 am

Yes I know, but if I don't check VTEC oil pressure switch enabled ???

In europe, we don't have the vtec oil pressure on the engine

I tried to connect the VTS wire to VTP wire, but the same problem.
I used a P28 ECU, and OBD2a->OBD1 conversion Harness, I weld a wire between VTS et VTP A8 to C15

Post by **Spunkster** » Tue Mar 13, 2007 11:19 am

If you do not have a vtec oil pressure sensor, then you should just disable that sensor in the vtec parameters.

DipDip · Post by **DipDip** » Tue Mar 13, 2007 11:34 am

Spunkster,
look config file "menfou1.skl" :arrow: vtec oil pressure sensor is Disabled.

Post by **Spunkster** » Tue Mar 13, 2007 12:08 pm

I was replying to menfou

DipDip · Post by **DipDip** » Tue Mar 13, 2007 12:24 pm

Spunkster wrote:I was replying to menfou

:shock:
Excuse me, Mister Spunkster, for putting guest in the discussion.
I thought that here it was a place of echange, but error.

menfou · Post by **menfou** » Wed Mar 14, 2007 12:07 am

Spunkster, it's not my first swap engine

I know how work vtec oil pressure sensor option on S300 or K100.

I have a other problem, but I don't know where :( , maybe the P28 ECU is dead

Post by **Hondata** » Wed Mar 14, 2007 9:03 am

menfou: it is not the pressure switch or any settings. The ECU does an electrical check that the VTEC spool value is operating when it is switched on. If there is a fault, it is the ECU, the VTEC spool or a high resistance wiring connector. Easiest thing to do is to swap the ECU over, and then swap the VTEC spool assembly over if the ECU checks out.

Post by **Spunkster** » Wed Mar 14, 2007 9:36 am

Was this an ecu that was non-vtec and has been converted to vtec.

menfou · Post by **menfou** » Wed Mar 14, 2007 10:13 am

I tried this P28 ECU in a Integra Type R with stock B18 calibration, and I have the same problem
I check with ohm-meter the connection, and I have 0ohms.

I will try with a other ECU

Praylewd powr · Post by **Praylewd powr** » Sun Mar 25, 2007 12:16 pm

I have had the exact same issue arise after I got my p28 s300 ecu back from Hondata. I have troubleshooted all the other things possible and swapped out two other vtec solenoids.