Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

Civic 2000 (D15Z6) Fuel Issues

 
Old 07-11-2019, 01:28 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

On cng when I press full accelerator car respond and then there is a jerk and then cel turns on and then it's normal. When I turn off the engine, the cel does not store.
Now when I short the 2 wire near ecu to read the blinks for code. I am getting:
no long blink -> 3 short blinks -> 1 long blink -> 4 short blinks

I interpret it as
3 - MAP sensor
14 - iacv
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Old 07-11-2019, 04:10 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Since your CNG kit is broken anyway, you may want to remove the kit parts that could interfere with petrol operation (electrical tape?) and concentrate on getting the car to work well on petrol only. That's kind of a pre-requisite to a good dual-fuel conversion anyway.

Mixing VTEC-E parts with regular ones does not work. Was the car originally a VX? Identify all the parts-- the ECU, the head, and the sensors (5 wire or 4 wire O2 sensor?) and confirm that they are made to work with each other.

The ECU held by one bolt and a hardware store washer indicates that someone has removed it before. As others said, the part number label if still present will be on the side.
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Old 07-11-2019, 05:10 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post
I cannot access the wire of sending unit as I don't know how to remove the rear seats

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Old 07-11-2019, 05:21 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post
On cng when I press full accelerator car respond and then there is a jerk and then cel turns on and then it's normal. When I turn off the engine, the cel does not store.
Now when I short the 2 wire near ecu to read the blinks for code. I am getting:
no long blink -> 3 short blinks -> 1 long blink -> 4 short blinks

I interpret it as
3 - MAP sensor
14 - iacv
Code 3 indicates an electrical issue in the MAP sensor circuit.

Code 14 indicates either an electrical or mechanical IACV problem. An OBD2 code reader could distinguish whether the problem is electrical or mechanical.

Fixing the problems causing these two CEL codes would likely improve gas mileage.

Remove the 7.5A BackUp fuse in the hood fuse box for 5 minutes to clear the two codes from the ECU. After reinstalling the fuse, drive the car until the CEL turns on. Do both codes repeat?
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Old 07-11-2019, 07:20 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by mk378 View Post
Since your CNG kit is broken anyway, you may want to remove the kit parts that could interfere with petrol operation (electrical tape?) and concentrate on getting the car to work well on petrol only. That's kind of a pre-requisite to a good dual-fuel conversion anyway.

Mixing VTEC-E parts with regular ones does not work. Was the car originally a VX? Identify all the parts-- the ECU, the head, and the sensors (5 wire or 4 wire O2 sensor?) and confirm that they are made to work with each other.

The ECU held by one bolt and a hardware store washer indicates that someone has removed it before. As others said, the part number label if still present will be on the side.
The head code is P2J -4 and on one side 95 is stamped. I will be soon taking the ecu out to read the label.

The stock car with D16y8 does not have O2 sensor here in Pakistan. But I think this european engine should have it but it is not there but no cel because of it.

The car is a full option sedan called vti oriel here and model is 2000.
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Old 07-11-2019, 07:23 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by muellersfan View Post
Code 3 indicates an electrical issue in the MAP sensor circuit.

Code 14 indicates either an electrical or mechanical IACV problem. An OBD2 code reader could distinguish whether the problem is electrical or mechanical.

Fixing the problems causing these two CEL codes would likely improve gas mileage.

Remove the 7.5A BackUp fuse in the hood fuse box for 5 minutes to clear the two codes from the ECU. After reinstalling the fuse, drive the car until the CEL turns on. Do both codes repeat?
IACV is fully jammed as when I put load the car does not maintain rpm. A mechanic here has done a tweak by connecting a wire from the condenser fan to the IACV green wire so when ac is on it gets more current and it maintains idle.

The cel is never stored, it only gets when I am driving and if i turn off the ignition it is not there.

Can I clean map sensor with WD40 or any rust cleaner?
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Old 07-11-2019, 07:26 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by muellersfan View Post
Car seats
we don't have this kind of seats here but I will try to figure out how to remove it.

Thanks
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Old 07-11-2019, 07:57 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post

Giving me pics doesn't help.
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Old 07-11-2019, 12:39 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post
we don't have this kind of seats here but I will try to figure out how to remove it.

Thanks
Post pics
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Old 07-11-2019, 12:48 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post
IACV is fully jammed as when I put load the car does not maintain rpm. A mechanic here has done a tweak by connecting a wire from the condenser fan to the IACV green wire so when ac is on it gets more current and it maintains idle.

The cel is never stored, it only gets when I am driving and if i turn off the ignition it is not there.

Can I clean map sensor with WD40 or any rust cleaner?
Please answer this
Thanks
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Old 07-11-2019, 01:11 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post
Please answer this
Thanks
WD40, brake cleaner, or carburetor cleaner may work for the IACV but not the MAP sensor.

Map sensor code 3 is an ELECTRICAL problem not a mechanical one. Pull out your multimeter and use it to voltage and Ohm test the MAP sensor wires.
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Old 07-11-2019, 01:13 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by muellersfan View Post
WD40, brake cleaner, or carburetor cleaner should work.
And what about throttle body cleaning?

Should I spray wd 40 directly in to the hole of map sensor and let it dry?
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Old 07-11-2019, 01:16 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post
And what about throttle body cleaning?

Should I spray wd 40 directly in to the hole of map sensor and let it dry?
See below. I edited my post.
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Old 07-11-2019, 02:53 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

The MAP sensor wire does not look stock. Is it part of the CNG conversion? Again my recommendation on that is to revert the car to petrol only until you have it running properly.

Quit with the extra wires and "tweaks." Just don't. The Honda engineers knew what they were doing. Find the problems and repair properly.

Do not try to clean out the MAP sensor with any substance. It's only going to cause damage. It's made to handle air only.

If codes are not stored when you turn the key off, the BACK UP fuse or circuit from the underhood fuse box is bad. This is very commonly caused by improperly installing an aftermarket radio.
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Old 07-11-2019, 04:33 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by mk378 View Post
If codes are not stored when you turn the key off, the BACK UP fuse or circuit from the underhood fuse box is blown.
^
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Old 07-11-2019, 05:06 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by mk378 View Post
The MAP sensor wire does not look stock. Is it part of the CNG conversion? Again my recommendation on that is to revert the car to petrol only until you have it running properly.

Quit with the extra wires and "tweaks." Just don't. The Honda engineers knew what they were doing. Find the problems and repair properly.

Do not try to clean out the MAP sensor with any substance. It's only going to cause damage. It's made to handle air only.

If codes are not stored when you turn the key off, the BACK UP fuse or circuit from the underhood fuse box is bad. This is very commonly caused by improperly installing an aftermarket radio.
I think no sensor wiring is altered except the injectors. The map sensor wire colours are matching with the service manual.

A few months ago my back up fuse was blown and the dash clock also not works but after replacing the fuse it works till now. My radio is the stock one and does not work may be it is disconnected from the back. But the dash clock is the sign that the fuse is ok.
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Old 07-11-2019, 05:14 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post
The map sensor wire colours are matching with the service manual.
Put your multimeter to work. It's very bored doing nothing in your toolbox.
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Old 07-11-2019, 05:18 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Thanks everyone for the help,

I will be checking these things soon and will report here
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Old 07-11-2019, 05:22 PM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post
Thanks everyone for the help,

I will be checking these things soon and will report here

If the BackUP fuse were blown, the clock would still work, but it would not hold time after you turn the key OFF.

Last edited by muellersfan; 07-11-2019 at 05:37 PM.
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Old 07-12-2019, 12:19 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by muellersfan View Post
If the BackUP fuse were blown, the clock would still work, but it would not hold time after you turn the key OFF.
Clock does hold time
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Old 07-12-2019, 12:21 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues




Here is the ecu installed
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Old 07-12-2019, 01:06 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post
Here is the ecu installed
This is the ecu which comes with our stock d16y8 in Pakistan.
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Old 07-12-2019, 04:16 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Where do the wires from your MAP sensor go? They appear to lead down to some part of the CNG kit. In the usual stock setup they tee directly into to the engine harness along with the TPS.
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Old 07-12-2019, 04:33 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

Originally Posted by Hasan Khurshid View Post
Clock does hold time
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Old 07-12-2019, 04:36 AM
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Default Re: Civic 2000 (D15Z6) Fuel Issues

The back up circuit to the clock, radio, ECU, etc. should be a white wire with blue stripe. If you find such a wire at the ECU it should be live all the time.

This may be important for more than just storing codes. The USDM OBDII stores calibration in the ECU RAM. If the power to the ECU is cut, it will run badly for several minutes the next time is is started until it can recalibrate. If the backup circuit never works, it would do that on every start.
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