p0400 means the EGR is bad, they fail 2 ways, one causes only silly error (stuck closed) failure mode #2 stuck open and engine will not idle and stalls )
only a new one cures sticking, failure mode #2 EGR, is at random or every stop light (sign) the engine stalls for #2 cause. as you stop the car the ECU commads the EGR closed.
and fails.
OBD2 car USA>
know that the ECU only can tell you if sensors are dead, and not weak, with some exceptions, like Idle Air Control System” code. and P-042x errors CAT weak.
Unsafe at any speed, (RALPH NADER 1965 do not look here) my joke this morning,
he'd have cow on this car, Toyota paid out billions in fines for this, not suzuki yet and it is guilty.
the ECU on most these cars 80/95 love to surge, but not 96+ that Ive seen. but yes, sure can if some things happen. (not ECU fault (LIKE VACUUM LEAKS DO)
to fix any car like this , this is what I do
only a new one cures sticking, failure mode #2 EGR, is at random or every stop light (sign) the engine stalls for #2 cause. as you stop the car the ECU commads the EGR closed.
and fails.
OBD2 car USA>
know that the ECU only can tell you if sensors are dead, and not weak, with some exceptions, like Idle Air Control System” code. and P-042x errors CAT weak.
Unsafe at any speed, (RALPH NADER 1965 do not look here) my joke this morning,
he'd have cow on this car, Toyota paid out billions in fines for this, not suzuki yet and it is guilty.
the ECU on most these cars 80/95 love to surge, but not 96+ that Ive seen. but yes, sure can if some things happen. (not ECU fault (LIKE VACUUM LEAKS DO)
to fix any car like this , this is what I do
- clean the EGR or replace it, make sure it is 100% closed and not leaking air past the valve inside, then defeat it until car runs right again, !!..
- to defeat it , pull the hose to it and use a GOLF tee , in the hose so the engine can not suck ILLEGAL unmetered air. so easy to do this. until it runs right again !
- EGR is now 100% defeated so we can focus on all other things,
- also rule #1 , is OBD2 may take 2 or more driving cycles to show DTC errors so always use the PENDING button on the scan tool, code readers cheap are junk here.
- The first thing to do is, test the MAF< output at keyon not started, and at idle and then gun the throttle , 3 tests seen here. ( I clean it first with MAF cleaner or carb cleaner)
- make sure there is no damage at all to the main huge induction pipe from TB to MAF, mine had bad boot gaskets and the aluminum pipe there had broken mount and was sucking air via this huge, 1/2" square cracked off mount. (day1, found 1996 tracker)
- next is fuel pressure, the FPR loves to fail this old, and fuel pressure at idle and key on only must not be out of spec, and the 6PSI pressure drop keyon only to idle.
- ect tests good, hot 300 ohms hot. hot engine key off, unplug ECT connector , using unlock tab, reads 300ohms for 180f, must or near.
- all 3 throttle cables must have 1/2" slack (throttle, A/T kickdown , and cruise if opted)
- foot off throttle the TV valve is closed 99.9%, or at .0005" gap, if not see #9 or find some bad guy secrewed in the never touch stop screw, at TV base gap.
- This is just a starting set of checks , lots more can be done. but first get the EGR defeated and the MAF working first.
- Do not ever use EBAY or amazon $15 MAFs ever. they are all Crap. CLEAN YOURS FIRST THEN TEST IT. NEXT
- WATCH OUT FOR SHOT GUNNING PARTS, as this can add one more bad part to the mix and super hard to diagnose that. (many parts sold now are crap from china)
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