Weird CEL after a bump start - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

guybo · 07-18-2016, 09:43 AM

I was in Reverse. Maybe that had something to do with it?

Spartarus · 07-18-2016, 10:31 AM

It also depends on how they wrote the cranking logic.

If you don't trigger the cranking table, you won't get start-related trouble codes. If your bump start turns the engine over faster than max cranking rpm for example, the ECU may use the normal running tables.

On Haltech ecu's, cranking tables are used below max cranking RPM. The OEM Denso stuff on this car may have much more complicated logic.

Ultramaroon · 07-18-2016, 02:44 PM

Quote:

Originally Posted by Spartarus

I didn't write the code that trips the CEL, and given the usual habits of OEM's I'm sure the logic is quite complex.

There could be many reasons it doesn't trip every time.

It may only trip under specific circumstances. If anybody cares enough to get on a hill and figure out the logic, go ahead.

No snarkiness intended in my last. Just adding observations. Apologies if I came off sounding anything less than engaged and curious.

Spartarus · 07-18-2016, 03:58 PM

Quote:

Originally Posted by Ultramaroon

No snarkiness intended in my last. Just adding observations. Apologies if I came off sounding anything less than engaged and curious.

No defensiveness intended. It was an interesting observation that I was not aware of.

I learn something every day

07-18-2016, 10:31 AM	#16
Spartarus ...Just add nauseum Join Date: Jan 2015 Drives: 2003 (AP1) S2000 Location: Miami, FL Posts: 546 Thanks: 310 Thanked 785 Times in 335 Posts Mentioned: 19 Post(s) Tagged: 1 Thread(s)	It also depends on how they wrote the cranking logic. If you don't trigger the cranking table, you won't get start-related trouble codes. If your bump start turns the engine over faster than max cranking rpm for example, the ECU may use the normal running tables. On Haltech ecu's, cranking tables are used below max cranking RPM. The OEM Denso stuff on this car may have much more complicated logic. __________________ There are many ways to displace. -Spartarus Last edited by Spartarus; 07-18-2016 at 10:44 AM.

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07-18-2016, 09:43 AM	#15
guybo Huge E85 fan! Join Date: May 2016 Drives: 2016 Scion FRS Location: Tampa, FL, USA Posts: 1,850 Thanks: 539 Thanked 1,010 Times in 605 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	I was in Reverse. Maybe that had something to do with it?

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