Civic D15B(Exi) Idle issue

[hammi]

I will look for the Gear code tomorrow and search for the service manual. Will the service manual tell if the solenoids need VSS signal to work?

[Hassan1991]

Yes.
Between ecu controls solenoid and vss input goes straight to ecu. If you don't have vss means transmission will stay in limp mode.

[hammi]

Hmm. So I need to connect the VSS first. Now the gear has a mechanical wire either someone removed the VSS to make the speedo work or this gear comes with a mechanical wire. But if the gear has solenoids on it it should have a VSS too to signal the ECU. I will look for the VSS for this gear box. I have heard some VSS had digital and mechanical output both. If I find one it will be a treat. As There’s already a big bill pending of replacing the Main engine/gear seal

[Hassan1991]

Someone must have changed it.
Better to find original one otherwise you might show wrong speed.
Have you seen you cluster? In old efi cars with mechanical cable the cluster makes pulse signals which goes to ecu.

[hammi]

No. I haven’t checked on it the car is a Honda accord 1987 it was originally carburettor. I dont think the speedo will have an output for VSS I will still look into it.

[hammi]

The car was originally automatic I dont know how advanced its gear was back then did it even have any solenoids

[Xulfiqar]

The PNP switch is the "Park Neutral Pass" switch, it will show either "PN" when in Park or Neutral or "IG" meaning in gear in any position other than Park and Neutral.

The D indicator connection in ECU is to use it as a check lamp when the transmission suffers an electronic failure. Thats why its supposed to be wired through the ECU, it has a D pin in and a D lamp out pin on the ECU.

the lockup solenoids will not work while standing at idle, the parameters will change once the car reaches cruise speed with reduced engine load and yes it requires the VSS, engine CTS, Crank speed, MAP load etc to be correct.

[Hassan1991]

Yes indeed.

[Xulfiqar]

The original automatic transmission of this accord was full hydraulic 4 speed automatic with no electronic connections other than the input to the dashboard cluster for the indicator lamps. Everything is fully hydraulic, it had a pressure cable and a governor to command up and downshifts. (very simple)

your civic gearbox seems thats its a regular one but you are running an electronic gear ECU with it.

btw - you cannot wire up the ELD in this car as the "ELD sensor" which is also called "shunt" is missing from the fusebox of this car. The original EFI versions of this car had it though.

[hammi]

I drove the car with the scanner connected. The values did not change at all. I think its looking for a VSS then. I will get the VSS problem sorted out tomorrow. Thank you!

[Xulfiqar]

does your car not have a VSS wired up?

[hammi]

I’m using a P2C Ecu now. Its from a Local civic. It does not support ELD I think as there is no DTC now. It was asking for a IMA(Idle Mixture Actuator) which I by chance found from a electrician currently I have set it on 1.2 volts to get a good average although pick has reduced. I dont know if its a good idea running too lean might just put a sunroof on the pistons(thats what i have heard). Though average seems to have improved a lot even without the solenoids not working but I keep the RPM below 2000 because it feels zulm with the transmission as the TC doesnt lock and feels like a CVT coupled with a 660cc pulling a truck

[Xulfiqar]

does your transmission actually shift at all?

[hammi]

.

No the gearbox has a mechanical wire

[hammi]

Yes it does shift it has a wire too which is connected to the accelerator upon fiddling with it the shifting changes if I tighten the wire the car shifts at higher rpm and downshifts earlier.

[hammi]

The Ecu is connected with the Solenoids. If I disconnect the grip of the solenoids it gives a DTC solenoid B circuit break. I think its just the VSS thats missing.

[Hassan1991]

Lean mixture is more worse then rich. Get it's fuel trim pot set at idle.

[Xulfiqar]

you need to change that and the speedometer in your cluster so it can run off a VSS signal the ECU is wanting to see. Older Honda ECUs were easy to get wired up via this cable speedometer as they had a magnet and steel probe to generate a signal.

Newer ones require a hall effect sensor signal which is pulled down by the sensor in short pulses to make a nice sinewave pattern

[hasankhurshid29]

was playing around with the distributor just to check if the timing changes on the Scanner. Youre right the Ecu keeps on adjusting the value to 12 degrees no matter what. Doing the experiment I lost the original position of the distributor. I will borrow the timing gun again and set the timing There is no special function in the ECU to take a nap and let me adjust the timing manually

I think you haven't seen videos on YouTube on how to set timing on D series engine. Firstly warm up the engine to operating temperature.
Then short the SCS connector (2 pin connector) near ecu which will disable the control of timing through ecu. Then you have to set the base timing through timing gun.

[hasankhurshid29]

I dont know if its a good idea running too lean might just put a sunroof on the pistons(thats what i have heard)

Running lean will damage the engine quickly than running rich.