D4 Light flashes
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D4 Light flashes
When driving for a period of time my D4 light starts flashing. After a period of time when the car is off (more than an hour) the light is not on until driving an amount of time as I said before. my speedo and rpms act normal when its flashing and my car drives normal. I installed this transmission over the weekend, its a H23 and I also have the H23 tcu too. Thanks
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Re: D4 Light flashes
When driving for a period of time my D4 light starts flashing. After a period of time when the car is off (more than an hour) the light is not on until driving an amount of time as I said before. my speedo and rpms act normal when its flashing and my car drives normal. I installed this transmission over the weekend, its a H23 and I also have the H23 tcu too. Thanks
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From: 94577/Gaillimh
Re: D4 Light flashes
Light will flash when there is a current issue.
Light will turn off and store code.
Unless it is a hard fault the light will turn off.
I wouldn't bother with the H23 TCU if you are still running the F22 ECU and engine. Transmission is a 'dumb' device and will operate fine with the F22 TCU.
Light will turn off and store code.
Unless it is a hard fault the light will turn off.
I wouldn't bother with the H23 TCU if you are still running the F22 ECU and engine. Transmission is a 'dumb' device and will operate fine with the F22 TCU.
Thread Starter
Honda-Tech Member
Joined: Apr 2018
Posts: 12
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Re: D4 Light flashes
Light will flash when there is a current issue.
Light will turn off and store code.
Unless it is a hard fault the light will turn off.
I wouldn't bother with the H23 TCU if you are still running the F22 ECU and engine. Transmission is a 'dumb' device and will operate fine with the F22 TCU.
Light will turn off and store code.
Unless it is a hard fault the light will turn off.
I wouldn't bother with the H23 TCU if you are still running the F22 ECU and engine. Transmission is a 'dumb' device and will operate fine with the F22 TCU.
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Joined: Feb 2009
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From: 94577/Gaillimh
Re: D4 Light flashes
Pull the code(s) and see what it is.
TCU is for shifting, this is based on the torque curve of the engine. An H23 will have a broader torque curve than a F22 so the shift points for an F22 will be off, it may shift too early or late for the F22. In daily putt-putt driving you may not notice any difference, but under 'enthusiastic' driving the shift points may feel 'off'.
TCU is for shifting, this is based on the torque curve of the engine. An H23 will have a broader torque curve than a F22 so the shift points for an F22 will be off, it may shift too early or late for the F22. In daily putt-putt driving you may not notice any difference, but under 'enthusiastic' driving the shift points may feel 'off'.
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