ign output problem - v1.0.73

[Sanjuro]

Solved:
mdh commands don't do anything.  Hook up your vems to a known working trigger source and check actual output.


I've been having the most stupid (yet frustrating) problem - I can't get the IGN outputs to switch!  Measuring with a DVM using GND as the base, the output shows 5.5V.  Issuing mdh82/02 (and every other combination for ignition channels) does nothing. 

Setting h[2] to pin 35 only gives me the following output when issuing mdh82/02:  
ÿÿÿÿÿÿÿÿÿÿ<00><00><00><00><00><00><00><00>

Interestingly enough, if I take a channel out of the h[2] table, it will drop the output voltage relative to GND to 0...  what is going on here?

[rob@vems.co.uk]

How do you mean take a channel out?

Can you paste what your H[2] looks like, then when a channel is taken on?

Cheers

Rob

[Sanjuro]

Thanks for your help bob!  I'm sure this is some setting I forgot to check off somewhere...  here we go:

starting with h2 as the following:
h[2]=50 40 30 20 10 00 00 00

issuing mdh02 through 72 to make sure output are turned off, console gives the following response:
20 10 08 04 02 01 FF FF FF FF FF FF FF FF FF FF 50 40 30 20 10 00 00 00

voltage measurement from output 00 to 07, GND base
5.5 5.5 5.5 5.5 5.5 5.5 0 0

voltage measurement from output 00 to 07, +12V (13.2v actual) base
7.7 7.7 7.7 7.7 7.7 7.7 13.2 13.2


if i change h2 to the following:
h[2]=00 00 00 00 00 00 00 00

issuing mdh02 through 72 to make sure output are turned off, console gives the following response:
20 10 08 04 02 01 FF FF FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00

voltage measurement from output 00 to 07, GND base
5.5 0 0 0 0 0 0 0

voltage measurement from output 00 to 07, +12V (13.2v actual) base
7.7 13.2 13.2 13.2 13.2 13.2 13.2 13.2

issuing mdh82-f2 in either case does nothing to the output voltage.

config as follows.  its prob full of mistakes since i just started messing with it

Code: [Select]


primep=00

primep_temp_scaling=FF

cwl=60

cwh=20

cranking_thres=04

awev=46

awev_temp_scaling=A0

awec=2A

warmup_clt_range[0]=00

warmup_clt_range[1]=11

warmup_clt_range[2]=25

warmup_clt_range[3]=39

warmup_clt_range[4]=50

warmup_clt_range[5]=64

warmup_clt_range[6]=78

warmup_clt_range[7]=8C

warmup_clt_range[8]=AA

warmup_clt_range[9]=C8

warmup_clt[0]=96

warmup_clt[1]=96

warmup_clt[2]=96

warmup_clt[3]=96

warmup_clt[4]=8C

warmup_clt[5]=82

warmup_clt[6]=78

warmup_clt[7]=6E

warmup_clt[8]=69

warmup_clt[9]=64

warmup_rpm_scale=DE

req_fuel=40

divider=01

alternate=15

injopen=00

battfac=13

kpafac=39

kpaoffs=9C

injocfuel=2A

injrampup_battfac=FF

injpwm=FF

injpwmt=0A

als_launch_input=0A

rpmk[0]=02

rpmk[1]=EE

tpsdot_kpadot_conf=00

tpsdotrate[0]=02

tpsdotrate[1]=05

tpsdotrate[2]=0A

tpsdotrate[3]=28

tpsaq[0]=02

tpsaq[1]=05

tpsaq[2]=0A

tpsaq[3]=14

als_cut_mintps=FF

tpsasync=0A

acmult=78

tpsacold=01

launch_enrich=00

launch_retard=00

overrun_fuelcut=14

overrun_fuelresume=13

rev_limit=46

airden_ignore=00

config11=51

config12=40

config13=02

batt_cal=BC

fastidle=C6

als_max_cut=00

dbaro=0C

tps_low=0F

tps_high=D0

fan_temp=5F

fan_hyst=05

fan_channel=FF

iac_step_seq=C9

iac_conf=48

iac_max_steps=FF

iac_tps_thres=08

iac_cold_idle_temp=90

iac_warm_idle_temp=C6

iac_cold_rpm=78

iac_warm_rpm=5C

iac_cold_start_pos=E6

iac_warm_start_pos=D9

iac_afterstart_rpm=0F

iac_afterstart_duration=96

iac_speed=32

iac_kp=14

iac_ki=0F

iac_kd=1E

launch_rpm=14

iac_integral_limit_dec=32

iac_integral_limit_inc=8C

iac_integral_deadband=14

iac_deadband=0A

als_cut_maxtps=00

iac_overclose_interval=80

iac_ref_pos[0]=BF

iac_ref_pos[1]=B3

iac_ref_pos[2]=A6

iac_ref_pos[3]=99

iac_ref_pos[4]=8C

iac_ref_pos[5]=80

iac_ref_pos[6]=73

iac_ref_pos[7]=66

iac_ref_pos[8]=59

iac_ref_pos[9]=4D

iac_sol_channel=7F

iac_ign_slope=20

softrpm_range=04

iac_ign_advance_limit=08

iac_ign_retard_limit=08

iac_ign_threshold=08

ego_conf=06

ego_lag=01

ego_coolant=B4

ego_maxtps=E6

ego_maxmap=FF

ego_minrpm=06

ego_maxrpm=49

ego_warmup=3C

ego_lean_limit=33

ego_rich_limit=0D

ego_pid_kp=28

als_enrich=00

ego_delta=59

ego_target=19

ego_pid_window=FF

wbo2_warmup_ramp=C0

als_react_tps=00

wbo2_abs_limit=F5

wbo2_limit_maxt=A0

wbo2_fallback=60

wbo2_retry_t=06

wbo2_edgetime_corr=FF

wbo2_edgetime_min=FF

wbo2_ri_target=9A

wbo2_nernstdc_target=86

wbo2_pump_pw_zero=64

wbo2_calibration=CE

wbo2_heater_pid_kp=46

wbo2_heater_pid_ki=10

wbo2_heater_pid_kd=1A

wbo2_heater_pid_ilimit=80

wbo2_pump_pid_kp=15

wbo2_pump_pid_ki=37

wbo2_pump_pid_kd=00

wbo2_pump_pid_ilimit=FF

wbo2_ri_confidence_scale=80

knock_conf=01

knock_sampling_window=FF

knock1_frequency=29

knock1_gain=3F

knock1_integrator=1F

knock2_frequency=29

knock2_gain=3F

knock2_integrator=1F

knock_threshold=FF

knock_noise_scale=FF

knock_max_retard=00

knock_default_retard=00

knock_retard_step=00

knock_retard_delay=00

knock_advance_step=00

knock_advance_delay=00

knock_minrpm=FF

knock_maxrpm=FF

ve_learn_coolant=D8

ve_learn_max_power=FF

ve_learn_rpm_scale=1E

ve_learn_kpa_scale=1E

ve_learn_ego_scale=43

ve_learn_min_weight=4D

ve_learn_speed=FF

ve_learn_limit=33

ve_learn_conf=00

lcd_c0=FE

lcd_delay=FF

lcd_backlight=FF

kpa_conf=21

ign_balance=FF

als_retard_mintps=FF

als_retard_maxtps=00

lcd_default_view=00

primary_trigger=00

secondary_trigger=19

tooth_wheel=3A

trigger_tooth=01

another_trigger_tooth=08

crank_minper=9C

tooth_wheel_twidth1=02

tooth_wheel_twidth2=06

cam_sync_r_edge_phase=01

cam_sync_f_edge_phase=02

reset_engphase_after=F0

ign_tdcdelay=62

ign_dwell14=1F

ign_dwell6=38

ign_crank_advance=00

ign_out=71

ignchmax=05

engine_off_delay=0F

pump_on_mintime=0B

fuelpump_channel=FF

inj_stage2_rate=FF

inj_stage2_start_tps=FF

inj_stage2_start_map=FF

als_deact_rpm=FF

als_deact_time=01

als_deact_egt=00

als_retard=00

als_rev_limit=FF

misc1out_minrpm=FF

misc1out_maxrpm=FF

misc1out_mintps=FF

misc1out_maxtps=FF

misc1out_minmap=FF

misc1out_maxmap=FF

misc1out_channel=FF

misc2out_minrpm=FF

misc2out_maxrpm=FF

misc2out_mintps=FF

misc2out_maxtps=FF

misc2out_minmap=FF

misc2out_maxmap=FF

misc2out_channel=FF

act_wot_rpm=FF

act_wot_channel=FF

act_rpm_rpm=FF

act_rpm_channel=FF

egt1_cal=FF

als_tks_channel=FF

boost_conf=FF

boost_targetoffs=FF

boost_minpressure=FF

boost_pid_kp=FF

boost_pid_ki=FF

boost_pid_kd=FF

boost_pid_ilimit=FF

boost_channel=FF

water_pump_temp=00

hybrid_rpm_a=00

hybrid_rpm_m=00

water_pump_hyst=00

water_pump_channel=FF

toothrel_normal=FF

toothrel_missing=FF

fuelcut_min_kpa=FF

fuelcut_max_kpa=FF

tach_channel=FF

tach_div=FF

shiftcut_conf=FF

shiftcut_channel=FF

shiftcut_time=FF

softrpm_rpm=FF



[Sanjuro]

In addition, i realized that my last set of tests was with invert_output enabled for some reason.  disabling it simply causes channel 00-07 to read 13.2 with respect to 12+, however I still can't enable (float the output?) the channel through mdh commands.

[Sanjuro]

Interestingly enough, after some struggle I came to the conclusion that the mdh command doesn't really do anything.  I hooked up the coil packs and crank the engine over - voila there is spark!     Same deal with fuel pump - turn the vems on and it pulls the output low for 2s.  however if I manually try to do the same thing with mdh, nothing happens!  Is mdh a depreciated command?

[rob@vems.co.uk]

I've never really got on with the mdh commands, my test bench is connected to the PC's speakers and a bunch of LEDs so I can see what's going on, if I need any specific information then I hook my scope up across the relevant LED and check more thoroughly.

[SamSpade]

What commands are available to individually test (turn on/off) outputs and read inputs?  Can't seem to find the info in MegaTune or in the scattered terminal documents.

[rob@vems.co.uk]

I went here:
http://www.vems.hu/wiki/index.php?page=GenBoard/Manual/DigitalOut/Table

Connected up using the Terminal program and typed

Man

Then mdhB2 and I saw a pulse on EC36pin36, but it was very quick - it looked to be as fast the dwell time setting allows.

[Sanjuro]

hmm I outta give that a shot.  I've always tested the mdh commands with a DVM, maybe that is why.

Out of curiosity, the doc says logic level ignition pulls to gnd when inactive - does that mean it simply floats when active?  I have it hooked up to Nissan Maxima coil packs right now and it sparks, but I always wondered whether or not I should add a pullup to 5v...

[rob@vems.co.uk]

A DVM will most likely miss a pulse that is ~3ms long.

As I understand it logic level gives either 5v or 0v as its designed to drive the Gate of an IGBT.  The built-in IGBT pulls to ground when its active.

[SamSpade]

Rob is correct.  Logic level output is driven by a 74HC259, so it will actively go to both 0V and 5V (can source and sink current).

It's not to be confused with the TPIC6A259 (P259), which can only sink current.

[Sanjuro]

aah I see, the guide made it seem that it can only sink current.  Good to know!  Know I know why my coil packs mysteriously work

[SamSpade]

Did some testing.  The mdh (i.e. mdhd2 to turn on EC36-12 IGN CH5) commands work on the ignition outputs -- with some caveats.

If the ignition output being tested is configured to spark (part of h[2] and ignchmax reaches it), the duration of the pulse is unpredictable.  It ranged from 0.5 ms up to 80 ms when I tested EC36-12 (CH5), regardless of the dwell settings.




This was done on my newly arrived pre-assembled VEMS 3.3, firmware 1.0.73 (Sat Apr 14 14:23:51 CEST 2007).  IGBT output pin EC36-12 (CH5) was pulled high to +5V EC36-28 using a 10KΩ resistor.

[rob@vems.co.uk]

Cheers for that Sam, very odd how it should be random