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Hard start when ECU and INJECTOR driver ..ok

Fuel system ok

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Why does the control board gets hot after abt 30mins of ignition and the injectors stop working hence the car cant move?

engine wont start, or run, moving is way beyond that.
now a wild guess, he PCM gets hot.
there are only 2 causes (yes, i repair them and other modules (boards)
1: battery voltage too high (alternator went berserk)
2: ECU outputs shorted,

just 2.
to if battery is ok
then remove all ecu outputs.
1: all injectors, ok now? no hot?
2: all VSV solenoids.
3: all relay off PCM (fuel pump relay )
4: ISC connector pulled.

no engine stated, of the 6 or more
nor country, yes, they run unique PCM from ours (laws)
this is USA site so, no country ,hard to help you.

Feb 03, 2015 | 2006 Toyota Corolla S

1 Answer

Will not start, fuel problem

ok, ill guess it cranks perfectly.
fact 1, there will be no fueling unless the ECU is happy.
happy means:
  1. ECU thinks spark it good. (it has a pin a1 monitor)
  2. Spark is good.
  3. Throttle not stuck (TPS errors) wide open throttle.
if spark is good, IS IT? on all 4 ?
then try test fuel, if it runs for 3seconds on test fuel then the cam belt is not slipped, and there is spark.
if it does not run on tests fuel there is no spark or timed wrong, or the cam belt slipped. (very common on zero serviced cars)
if timing is still correct and runs on test fuel then we attack the ECU inputs. and outputs (the single injector)
this all sounds complex and is not
lets play that out.
  1. ah dizzy rotor turns , cam belt not snapped.
  2. ah, the spark is good but is way off time the belt slipped....
  3. The engine runs on test fuel, wow sounds snappy too.
  4. ok , i use a NOID light on INJECTOR pins 1and 2.
  5. the lamp is good, the fuel pressure , hark , is 0psi or 10. wrong
  6. the NOID fails, i then check TPS input voltage to the EDC
  7. its good, i find the tacho pin dead. OMG.

this year car the Distributor makes all spark the ECU does NOT.
but the ECU watches it like a hawk.
if pin A1 goes dead, ECU cuts fuel, ending crash and burn like seen on TV.

ask questions.

Jul 02, 2014 | 1990 Geo Tracker

1 Answer

Car starts and idols great but cuts out and dies when I give it gas, like it's flooded. Already changed fuel pump skreen and fuel filter. Air, fuel mixure?

  • too high fuel pressure. 30 ok 60 bad. PSI
  • leaking injectors
  • ECU injector driver shorted, turning on injectors full time
  • injector drive wire shorted to ground bad wiring.
  • ECT stuck at -40F (alaska temperature) USE a SCAN tool.
  • MAP sensor vacuum hose/pipe clogged (ECU thinks your are going up hill all the time and floods.
  • The scan tool can check each , but not fuel pressure.

that is a start,

Feb 20, 2014 | 1997 Toyota Corolla

1 Answer

No Injector Pulse

run fault codes as there is a problem sensor in the system. volts at the injector is suspect as the voltage will vary with the fuel requirement.

Jan 05, 2014 | 2005 Mazda Tribute

1 Answer

Hard starting 95 Mazda protege dx 1.5 l when cold

I would change the coolant temperature sender. Not the one for the gauge if it has one, the one for the computer. This is what tells the ECU to go into phase lock loop.

Aug 07, 2017 | Cars & Trucks

1 Answer

Trying to locate the ecu . the problum is we got 12 v to the injectors but they are not spraying gas .

check the fuel pressure to injectors to see if pump is working properly. there should be a schraider valve on engine fuel line under hood to test this. the ecu is located on floor directly behind radio. there is a black cover with 2 round plastic snaps that cover ecu. from drivers side, ecu is beside gas pedal. pull on the ecu cover to remove it. are all fuses and fuel pump relay ok !!

Mar 04, 2011 | 2000 Nissan Maxima

1 Answer

Audi a4 1.8t starting problem - on initial start car gets to approx 1,000 rpm and stops, like a fuel stavation. May take up to four starts to get it started. runs good once started

Will be the temp sensor (NOT FOR THE TEMP GAUGE!) the one that tells the ECU the engine is cold! when in this mode in cold the ECU sends more fuel to the cylinders this is known as fuel inrichment.... this is an fuel injection system's equivelent of an old choke. some systems us a separate injector in the air box of the manafoud,But this is more on old systems like Boch K-Tronic e.t.c. O.K.?

Mar 09, 2010 | 2003 Audi A4 Cabriolet

1 Answer

Francois Silver ? Walvis Bay - Namibia I have a 97 Chevy K2500 Cheyenne V8 fuel injection. I have a starting problem. When turning the ignition key, the fuel pump comes on and stops after 2 to 3 seconds....

It has nothing to do with ECU and immobiliser even if you turn your ECU OFF your car will start and will your but not properly without CPU your car will work in emergency mode. try finding Idle sensors and check them if they are ok

Jan 29, 2010 | 1997 Chevrolet C/K 2500

2 Answers

Volvo 850 2.0 1995 non starting already fitted new plugs leads cap roter arm cam and crank sencors good spark good fuel presure and no imobliser light on plugs all dry when turning over engine

try spraying some easy start into the air intake while someone operates the starter if it trys to start you have a fuel system fault have you checked fuel pressure at injector rail you need to do this using gauge and check against volvo spec if low it will never run if ok check feeds to injectors using multimeter if no feed check relevent fuses if ok using multimeter check continuety of injector wireing back to ecu if it did not try to start using easy start check timing belt is ok and engine has compression

Jan 02, 2010 | 1995 Volvo 850

2 Answers

MISFIRE ON CYLINDER 5. I have changed plugs, wires, coil pack, fuel injector, and ECU unit. I have had two compression tests and it was put on a diagnostic machine. Everyone is scratching their heads as...

Same problem. 94 LHS 3.5L engine. Noticeable rythmic misfire at idle. Looks like cyl 5. When I pull the injector connector off of cyl 5 the idle rythm does not change. It does if i pull the inj connector off of any other cylinder. Spark OK. Injector ok using seperate 12vdc supply (clicks). Connector to injector has pulses on it verified with a test light. Inj coil resistanceis 12 ohms, exactly what it should be.

Still need to check compression and intake manifold gasket

Jul 21, 2008 | Chrysler Concorde Cars & Trucks

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