EEC-IV SYNC_FAIL GHAJ0

non vehicle specific forum for tuning all other EEC-IV

EEC-IV SYNC_FAIL GHAJ0

Unread postby midnight_man » Tue Sep 18, 2018 12:43 pm

Guys...

what is SYNC_FAIL pid value?

I have 100% good engine timing but I have full log sync_fail going up and down 0-1

thanks.
midnight_man
General Poster
 
Posts: 61
Joined: Thu Feb 22, 2018 3:18 am
Vehicle Information: cossie

Re: EEC-IV SYNC_FAIL GHAJ0

Unread postby decipha » Tue Sep 18, 2018 12:54 pm

only thing i can think of would be the cam sensor not sync'd which means youd be in bank fire instead of sequential
User avatar
decipha
Tooner
 
Posts: 15515
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: EEC-IV SYNC_FAIL GHAJ0

Unread postby jsa » Wed Sep 19, 2018 2:15 am

From CDAN2 Strategy Document
SYNC_FAIL = Indicates sync signal has been lost or was incorrectly placed
after system was in sync; 0 -> sync okay, 1 -> bad or lost sync signal.



OVERVIEW
The synchronization logic processed during the PIP high interrupt is
responsible for incrementing the SYNC_CTR and determining if the CID signal
is lost. The SYNC_CTR is a register used to identify the position and cycle
of the engine's cylinders. When the CID signal is lost the SYNC_CTR is not
reset to 0 by the CID_PROCESSING logic. If the PIP high interrupt logic
observes that the counter has not been reset, i.e., SYNC_CTR is greater than
NUMCYL (the number of cylinders), it resets the counter and sets a flag
(SYNC_FAIL). If the counter does not get reset by the CID_PROCESSING logic a
second time, the command to synchronize fuel is canceled.



The primary purpose of the fuel service module is to deliver fuel pulses at
the appropriate requested timing. There are several basic modes of
operation:

1. Crank fuel - When in crank mode, all injectors are fired simultaneously.
The amount of fuel on each pulse, the interval between pulses, and the
PIP edge on which crank fuel is delivered are all determined by
calibration constants.

2. Unsynchronized fuel - If the strategy is unable to recognize
synchronization before leaving crank mode, injectors are fired
simultaneously every NUMCYL number of PIPs. If synchronization has still
not been detected after a specified amount of time is spent in run mode
(determined by the calibration constant MAX_RM_SIMUL), operation reverts
to unsynchronized sequential mode.

3. Transition from simultaneous to synchronized sequential fuel - When the
CID (or signature PIP) is recognized, the actual engine position is known
to the fuel strategy. The flag SYNFLG is set, to communicate this
recognition.

When out of crank mode and SYNFLG is set, the first sequential fuel event
is scheduled. The flag FIRST_SEQNTL indicates that this event has been
scheduled. The injector serviced by the first event is the one at the
top dead center of its intake stroke. This is accomplished by
initializing INJ_BANK1 and INJ_BANK2 to select the cylinder whose firing
order sequence number is the current value of SYNC_CTR + NUMCYL/2 (using
modulo NUMCYL arithmetic). TOTAL_DELAY1 and TOTAL_DELAY2 are initialized
to NUMCYL/2 to reflect the placement of the first pulse, and the flag
FUEL_IN_SYNC is set to allow new TOTAL_DELAY values to be calculated.

4. Synchronized sequential fuel - Once initial synchronization is attained,
TOTAL_DELAYn changes are clipped to 1.0 per fuel event. Changes to
TOTAL_DELAYn of more than one PIP cause immediate adjustments to
INJ_PIP_CNTn, the number of PIP edges until the fuel injection event is
scheduled on bank n. The IBETA calculation logic makes small adjustments
to IBETAn and INJ_PIP_CNTn to keep the fuel synchronized to the requested
TOTAL_DELAYn value.
Cheers
John
jsa
Power Poster
 
Posts: 399
Joined: Thu Jan 16, 2014 1:44 am
Location: In the shed or On the Computer, 'straya
Name: John
Vehicle Information: Escort RS Cosworth
EEC-IV GHAJ0 ANTI or COSY

Re: EEC-IV SYNC_FAIL GHAJ0

Unread postby midnight_man » Wed Sep 19, 2018 3:17 am

so :D JSA has sync-fail "1" in his logs....totally wrong!

I have 0/1 switching all time....


now the most important question is!

is there any flag which can determine that fuel injecting mode?

to see which mode is ecu using?

sailorbob?
midnight_man
General Poster
 
Posts: 61
Joined: Thu Feb 22, 2018 3:18 am
Vehicle Information: cossie

Re: EEC-IV SYNC_FAIL GHAJ0

Unread postby midnight_man » Wed Sep 19, 2018 1:04 pm

https://www.youtube.com/watch?v=_yKULA8dKUI

is that normal?

his is measured on output of edis module to one of coil...

if you rev it over 6000 there is looot of noise....
midnight_man
General Poster
 
Posts: 61
Joined: Thu Feb 22, 2018 3:18 am
Vehicle Information: cossie


Return to EEC-IV Tuning

Who is online

Users browsing this forum: gamh44 and 1 guest