commaai / commaai/opendbc

Honda: Detect stock ACC fault on Bosch cars

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Description

Seen on the CAN-FD Honda Pilot, but may exist on others.

In this case, I think the trigger may have been the "maximum load limit" condition. Stock ACC was requesting some acceleration, and it didn't quite happen despite the double down shift and RPM increase. Other possibilities are VSA activation or radar occlusion, but weather and road conditions seemed okay.

https://techinfo.honda.com/rjanisis/pubs/OM/AH/AT902525IOM/enu/details/131247047-553798.html#d_131_2470_47_554900

Image

Since this is a pcmCruise configuration, and stock ACC disengages on this condition, we're probably stuck with the immediate disable if it happens while engaged. However, we can make it easier to troubleshoot, and show a cruise fault alert while disengaged.

**Route:** `ea1fc707f10a580a/00000004--8e1fff35e5`

- [ ] #3141
- [ ] Scan for any hits in commaCarSegments
- [ ] Check to see if the existing Nidec HUD code works for Bosch
- [ ] Detect while driving (accFaulted or carFaultedNonCritical, TBD)

Contributor guide

No contributing guide indexed for this repository

Research direction

Start by scanning commaCarSegments for the provided route and checking whether the existing Nidec HUD code applies to Bosch cars. Investigate how the fault can be detected while driving, including the proposed accFaulted or carFaultedNonCritical paths. Done means Bosch stock ACC faults are detected and a cruise fault alert is shown while disengaged.

Written by the indexing model from the issue text.

Assessment

Domain
embedded-iot, reverse-engineering
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
38/100

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