MIL Flashes Regardless of SCS on/off

s300 and SManager software questions & answers
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uses0ap
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Joined: Thu Apr 28, 2022 10:48 am

MIL Flashes Regardless of SCS on/off

Post by uses0ap »

92 Integra
Rywire PDM (no oem wiring, all standalone)
Rywire Engine Harness
P28 S300 v3 [S/N: 57889 | F/W: 1.3 | S/W: 2.7.8]
All Capacitors Replaced by Nomis Ind
*Upgraded from a chipped ECU to S300, no wiring has changed. CEL (MIL+SCS) had no issues with chipped ECU installed.

I'm experiencing a strange issue where the MIL will flash codes regardless of SCS being grounded (SCS switched on/off). My question is if this is normal?
I thought the MIL should remain solid until the SCS is grounded to pull the codes, once SCS is grounded MIL should flash codes.

When I clear all codes, MIL will turn on for 2 seconds once ignition is switched on (SCS off). When I turn SCS on, the MIL remains off.
Shouldn't the MIL be on/solid if no codes are present and SCS is grounded?

*MIL wired to LED
*SCS wired to toggle switch
*Forced CEL by unplugging IAT
*CEL always flashes regardless of SCS grounded

Can verify SCS is on/off via Smanager under Sensors
MIL flashes code via Smananger under sensors
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Spunkster
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Location: Hondata

Re: MIL Flashes Regardless of SCS on/off

Post by Spunkster »

Post calibration and datalog showing the issue.
uses0ap
Posts: 6
Joined: Thu Apr 28, 2022 10:48 am

Re: MIL Flashes Regardless of SCS on/off

Post by uses0ap »

Attached requested files
Attachments
MIL_Datalog.s3d
MIL Datalog
(742.48 KiB) Downloaded 37 times
its_wideband.skl
Calibration
(47.42 KiB) Downloaded 47 times
uses0ap
Posts: 6
Joined: Thu Apr 28, 2022 10:48 am

Re: MIL Flashes Regardless of SCS on/off

Post by uses0ap »

Disregard the 'MIL_Datalog' file. I've uploaded new logs including SCS sensor readings:

SCS_No_MIL -- MIL does not turn on when SCS is grounded
SCS_MIL-ON -- Forced IAT error code by unplugging sensor, MIL flashes regardless of SCS on/off

I also noticed no errors trigger when pulling TPS or MAP sensor plugs. Not sure if that is normal behavior, as I have not driven the vehicle
Attachments
SCS_No-MIL.s3d
(228.78 KiB) Downloaded 41 times
SCS_MIL-On.s3d
(760.15 KiB) Downloaded 43 times
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Spunkster
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Posts: 22745
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: MIL Flashes Regardless of SCS on/off

Post by Spunkster »

You need to try this ECU in a known working vehicle to see if it exhibits the same issue.
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