Hondata

Vehicle: Renault 5 GTE -88 (K20A2 swap from 2003 Honda Civic Type R, wiring harness from the same car)
Serial number of K-Pro: 3714
ECU part number: 37820-PRB-A06 2068-600362
KManager version: 3.2.4
I got my K-pro used from a person in Sweden
Wiring to AFR sensor changed to work with wideband AFR sensor

The engine runs fine without error codes but the intake phaser doesn't work at all. CAM signal is 0 or sometimes -8 regardless of CAMCMD.
Sometimes i get the error code DTC P0011 VTC System Malfunction but that doesn't happen every time i drive the car
The oil pressure is fine, 2-3 bar at idle and 5-6bar at higher engine speeds, oil warning light doesn't light up either
I have checked the VTC filter next to the intake manifold and it was perfectly clean
I have replaced the VTC solenoid PNC model B23796 43601 with an identical one, i have tested the VTC solenoid with +12v according to the service manual and it moves as it should
I have checked the wiring to the VTC solenoid and ECU B1 is connected to the VTC oil control solenoid pin 2 and ECU B23 to VTC oil control solenoid pin 1. The resistance over the valve is 8 ohm, the resistance between ECU B1 and B23 is also 8 ohm. None of the wires have a short to earth. I have connected an oscilloscope and i have some kind of signal between the Pin 1 and 2 of the VTC oil control solenoid
I have also tired running the VTC oil control solenoid valve outside the engine connected to the ECU and it doesn't move at all, even despite that CAMCMD is around 30 deg. I used another non connected VTC oil control solenoid inside the engine to prevent oil leakage.
VTC, (iVTEC) checkbox is selected in K manager, if that check box is unselected CAM is stuck at -20 and CAMCMD is 0.

I have attached the calibration file and a datalog.

I'm really confused by the issue, it seems like the ECU and the VTC oil control solenoid doesn't work together as intended as the VTC oil control solenoid doesnt seem to move at all. There could also be an issue with the VTC actuator but that seems unlikely since the engine looks really clean inside.

P0011 will only appear with two driving cycles when the cam is different from the cam command for 15 seconds, but it does indicate what the problem is.

I think you have narrowed the problem down to the ECU. Either try your ECU in another vehicle or another ECU in your vehicle.

I have done some more tests.

I fitted another VTC solenoid but the VTC doesnt work. I also tried the VTC solenoid outside the engine connected to the ECU but it doesn't move (i used another VTC solenoid inside the engine not connected to the ECU to prevent leakage)

The VTC solenoid works fine when connected to an external +12v and ground. But not when connected with a bridge between ECU A3 and B1 S+ and the other pin to B23 S- according to the RSX service manual.
The wiring from ECU B1 and B23 is fine and not short circuited to ground.

My conclusion is that pin B23 S- is defective on my ECU. Pin B1 S+ might be defective as well but i'm not sure. The problem has been the ECU from the first start of the engine as the VTC has never worked according to the old log files. The wiring and the VTC solenoid is unchanged from the first start and correct.

I have attached a new log file where i have managed to get the intake cam moving but only by disconnecting the VTC solenoid from the ecu and feeding it external +12v and ground.

I have found information that the newer engines has a different VTC solenoid valve and wiring to the VTC valve. Is my ECU is intended for such an engine and wiring harness?

Yes, there are two different wiring methods for the VTC, and the ECU will not work if it was modified for use in an 05+ RSX. What make/model was the ECU used in before you purchased it?

I removed the ECU from the car and found a rattle. It seems like a capacitor has broken of the mainboard. I find that strange since the ECU has been mounted on rubber mounts on the inside of the firewall of my car.

Do somebody know if the capacitor could be the reason for my problems. I didnt notice any ratteling noise when i fitted the ECU to the car.

This is not uncommon, but usually on vehicles with solid engine mounts. A little silicone on the caps help to stop this.

Have you tried anything since you found out it was your ECU?

1320k24EK wrote:Have you tried anything since you found out it was your ECU?

No, i'm in the process of getting the ECU repaired or replaced.