HOW DO I WIRE MY VTEC SOLENOID TO THE ECU

  • Tiny
  • Acuracl2324
  • 1998 ACURA CL
  • 120,000 MILES

The car originally had a f23(non-vtec I believe), and it was swapped to a h22a1. And they have the vtec solenoid wired into the wiring harness, but I dont get vtec. Can I get a diagram, for the correct wiring. Ive been told, non-vtec wiring harness's are actually wired for vtec, but the wire is cut off somewhere along it.

can I get answers from, preferably a honda expert please.
thanks.

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Monday, October 15th, 2012 AT 5:22 AM

8 Replies

  • Tiny
  • KHLow2008
  • EXPERT
  • 41,981 POSTS

First thing is you need to have the correct PCM. At the PCM check connector B terminal #12 for a Green/Yellow wire. If it is there, the next place to check where it ends would be the main connector in engine compartment.

If the Green/Yellow wire is not present at PCM terminal, that is where you need to start you wire.

Previously the wireharness are rigged for both models and it seems this practice has been stopped some time back so most likely you won't find the wire there.

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Monday, October 15th, 2012 AT 6:46 AM
  • Tiny
  • Acuracl2324
  • MEMBER

I checked out the wiring, the grn/ylw wire goes all the way from the vtec solenoid to the ecu. I have an aftermarket chipped p28 VTEC ecu. So im completely lost on why I have no vtec. Are there any other things I would need to check out?

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Monday, October 15th, 2012 AT 3:57 PM
  • Tiny
  • Acuracl2324
  • MEMBER

Does my speedometer not working at all, have anything to do with it?

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Monday, October 15th, 2012 AT 4:01 PM
  • Tiny
  • KHLow2008
  • EXPERT
  • 41,981 POSTS

Did you test the VTEC solenoid to see if it is working? Clogged oil lines and low engine oil can cause that too.

Are you getting any trouble codes?

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Monday, October 15th, 2012 AT 4:02 PM
  • Tiny
  • KHLow2008
  • EXPERT
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Speedometer not working can affect performance and gear shifting if it is an automatic transmission.

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Monday, October 15th, 2012 AT 4:08 PM
  • Tiny
  • Wrenchtech
  • EXPERT
  • 20,567 POSTS

How are you able to determine that you don't have VTEC?

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Monday, October 15th, 2012 AT 4:25 PM
  • Tiny
  • Acuracl2324
  • MEMBER

When I plug in a scanner to it, it wont even let me run it to see if it throws codes. But I have no check engine light or anything.
Its not an automatic.
And vtec doesnt engage at all is how I know its not working. Id know if vtec hit, its not quiet.

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Monday, October 15th, 2012 AT 9:16 PM
  • Tiny
  • KHLow2008
  • EXPERT
  • 41,981 POSTS

Your previous engine was a VTEC engine as well, just that it is a SOHC with different operating conditions. For the H22A1, VTEC turns on at 5200 rpm and engine noise would sound different with extra pull.

If the scan tool cannot communicate, it can mean something is not wired correctly. If you have battery voltage at terminal # 16 and scan tool does not read, try the manual code retrieval to see if you can get the MIL to flash codes. Bridge terminal # 4 and # 9 and turn ignition switch on to see if it works.

If engine performance is below par, check the exhaust system for clogging.

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Tuesday, October 16th, 2012 AT 8:52 AM

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