Error 21 vtec spool on P28 ECU

s300 and SManager software questions & answers
menfou
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Error 21 vtec spool on P28 ECU

Post by menfou »

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.
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DipDip
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Post by DipDip »

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
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Post by menfou »

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
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Post by DipDip »

Turbo with stock MAP sensor ?

MSN, si tu veux, car plus pratique. :wink:

PS (MSN) : dip_itr@hotmail.fr
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Hondata
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Post by Hondata »

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.
Hondata
menfou
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Post by menfou »

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
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Spunkster
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Post by Spunkster »

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

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

I was replying to menfou
DipDip
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Post by DipDip »

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
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Post by menfou »

Spunkster, it's not my first swap engine :wink:
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
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Hondata
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Post by Hondata »

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.
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Spunkster
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Post by Spunkster »

Was this an ecu that was non-vtec and has been converted to vtec.
menfou
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Post by menfou »

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
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Post by Praylewd powr »

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.
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