2003 Honda Element

[AndreyB]

I might be able to borrow a starting & driving 2003 Honda Element on it's last breath. It's loud and there is some talk about only running on three cylinders with a stuck exhaust valve, but so far it moves!

https://raw.githubusercontent.com/wiki/rusefi/rusefi/OEM-Docs/Honda/2003-honda-element-ecu.png whos us ECU and TCU integrated into the same unit.

Dave do know trigger pattern? Do we know anything about transmission control? Do we know _anything_ about this maybe https://en.wikipedia.org/wiki/Honda_K_engine#K24A engine?

[AndreyB]

ECU is somewhere there

[AndreyB]

image.png

https://www.phearable.net/information/tech-area/02-04-prb-rsx-type-s-ecu-pin-out-diagrams.html

Dave says those are smart Denso coilsticks 2 ms dwell will run them pretty hot

[AndreyB]

I forgot that "most of Honda's automatic transmissions are unusual in that they do not use planetary gears like nearly all other makers" - that makes this project way less interesting

[AndreyB]

No tools are needed to remove Honda Element glove compartment - you can pull those retaining clips more or less with your bare hands.

image.png

In other news: catalytic converter was stolen at some unknown point in the past.

[AndreyB]

Well, some progress!

[AndreyB]

Good news I do not have IMRC on this engine

IMRC means Intake Manifold Runner Control

pin B22 IMRC valve position sensor potentiometer wow

image.png

https://my.prostreetonline.com/2014/10/21/dtc-p0661-service-imrc/

[AndreyB]

Getting closer!

https://rusefi.com/online/view.php?msq=693

[AndreyB]

image.png

Need help locating TDC on this exhaust cam wheel.

[AndreyB]

[AndreyB]

https://github.com/rusefi/rusefi_documentation/tree/master/OEM-Docs/Honda/2003-element/digital

Sweet data: logic analyzer capture of all three position sensors while cranking with zero spark plugs, with three spark plugs and with four spark plugs.

sample.png

[AndreyB]

VTC control which I believe is Honda speak for VVT does not work

I have intake cam postion pretty steady at steady RPM and change on accel/decel. I believe that intake position decoding is fine.

I have PID output changing from 10% to 90% on Proteus high side #2 and simply no response. What would be my next step to investigate this assuming electrical problem?

tune https://rusefi.com/online/view.php?msq=697

image.png

log https://rusefi.com/online/view.php?log=392

[blundar]

***VTEC*** / VTS is a high side drive. (variable lift / lock additional cam lobe to change profile / engage all 16 valves depending on implementation)

***VTC*** / VVT is low side drive AFAIK.

[AndreyB]

***VTC*** / VVT is low side drive AFAIK.

looks like those are both _same_. And same _high side_?

image.png

[AndreyB]

it works! I originally forgot to set output frequency, also needed more aggressive PID offset and P-factor

tune https://rusefi.com/online/view.php?msq=698
log https://rusefi.com/online/view.php?log=393

[AndreyB]

[AndreyB]

IAC works, VTS seems to work!

tune https://rusefi.com/online/view.php?msq=702
log https://rusefi.com/online/view.php?log=396

new issue https://github.com/rusefi/rusefi/issues/3447