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Ecu internal fault - F-350 Ford Cars & Trucks

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Can ignition module cause engine to have no injector pulse even though it has spark

injector pulse from ECU

the ECU will have fault codes stored internally to find the cause

would check other sensors first
crank angle sensor or cam angle sensor could stop the pulse

if the engine cranks over and has spark
ignition would be the last thing i would checkout

Nov 24, 2016 | Cars & Trucks

1 Answer

How do know when the brain box going bad in a 1988 Crown Victoria

It isn't easy deciding when an ecu is faulty as it is so rare they just fail and leave no doubt. Often the system develop faults, symptoms, codes that are inconsistent, misleading and generally don't make sense.

The only way forward is to check the system through the old fashioned way testing sensors and actuators and wiring with multimeter, oscilloscope, sensor simulators and whatever is available. If no faults are found but symptoms persist the integrity of the ecu must be suspected.

There are companies that make big promises of tests and repairs on ecu's but in reality the service rarely matches the promises.

If you know the history of the vehicle and there has been the sort of work that could have damaged or weakened the ecu in the last couple of years, that information can be used to underline suspicions formed from the results of tests.

Those earlier ecu's weren't as robust as many of the later types and welding, boost battery charging/starting and even jump starting had the potential to damage or weaken some of the internal components, leaving the ecu functional for up to a year or even two until an eventual failure or partial failure occurs.

I hope this helps...

Jul 11, 2016 | Cars & Trucks

1 Answer

2012 freightliner cascadia DD15 fault code ECU 1... prior to the fault code the engine bogged down really bad and solid yellow and check engine light come on.

an answer from just answers reports this
ecu 1 fault means the engine ECM has an internal fault and needs to be replaced
most of the time with this code it is not the ECM itself but usually a wiring problem going to the ECm
there should be 2 fuses for the ECM either next to the ecm in plastic covers by a starter or in a plastic box
check all wiring going to and from the engine and battery grounds
especially the grounds
check for wires rubbed through and loose terminals
take it to a service dealer for a proper diagnosis as it costs money wasting time trying to find the fault yourself as a truck standing still is not earning it's keep

Jun 05, 2016 | Cars & Trucks

1 Answer

Mitsubishi L 200 fault code u1101 problem

ECU internal or cable fault

Feb 24, 2016 | Mitsubishi Cars & Trucks

1 Answer

What is failt code 16988

If this is code 16988/P0604, it refers to Internal Contr.Module Random Access Memory (RAM) Error. This seems to relate to the ECU and may reset if the car is left without power for a while (disconnect the battery). Or it was triggered after the ECU lost power.

If it doesn't disappear, the fault codes should be reset with a VAG-COM tester. If it persists, it needs further diagnostics at the dealer.

Here's a table of VAG fault codes:
Audi Online Technical Library Diagnostic Trouble Codes DTC Tables
Here's another useful resource at ross-tech:
Main Page
Just type your error code into the search box and read on :)

Aug 03, 2014 | Skoda Octavia Cars & Trucks

1 Answer

Saab fault codes


Jan 12, 2014 | Cars & Trucks

2 Answers

Fault with ecu

fault with an ecu, ecu's can be fixed the only thing you need it the software putting back on it. some ecu are at fault as it may have had a glitch and lost some of its functions this can be fixed with a reprogram. some ecu after a time need to be updated. some ecu's are now automatically updated via a gsm network using the original radio your manual will tell you if this is fitted.more common faults with an ecu is not the ecu at all and a bad sensor engine knock sensors have been know to turn off the ecu. some engine are fitted with none start if the cat sensor has failed.limp mode is activated when the cam sensor or crank sensor has failed. some models if the egr has failed can put engine in limp mode or turn off the ecu. if a ecu fails for a none sensor related problem then the ecu has come under a fault, software or voltage. some of the old ecu were fitted with a temperature sensor either inside or on the case on the out side of the ecu. these can fail and will need to be replaced.

Aug 10, 2013 | Vauxhall Cars & Trucks

1 Answer

The air conditioner on my 2004 Jetta TDI will not turn on, the compressor clutch doesn't come on.

Then you must check up the A/C compressor electrical supply. First time the A/C fuse. Second time verify if A/C installation if refrigerant (R 134a type) pressure is OK. The best idea is to scan the A/C (or climatronic) ECU (Electronic Control Unit) memory by internal faults using diagnostic equipment connected to the Data Link Connector (DLC) of the car. For example could be the A/C pressure sensor out of order, and therefore A/C compressor does not have permission for starting. After faults reading you will be able to replace & repair damaged pieces, and erase & reset the A/C ECU.

Apr 13, 2010 | 2004 Volkswagen Jetta

1 Answer

I have code PO607 IN TOYOTA CAMRY 2003 2.4

Hi. this code concerns the CPU(ecu,ecm,pcm). Your CPU has an internal fault and it will need to be replaced. This should be covered under the TSB EG 042-07 and this repair is covered for 96 months or 80K miles.

I would check
the power and grounds to the PCM/ECU to make sure that it is receiving a current but, most likely, it a defective device and this repair should be free.

Please rate and god bless:)

Apr 21, 2009 | 2006 Toyota Corolla

1 Answer



If the light on the ECU is not flashing any codes then it is the ECU at fault, either due to an internal fault, or due to a supply voltage or earth fault.

If the light on the ECU is flashing then you need to count the flashes and pauses to formulate a fault code which will then point you in the right direction, but I would say that because you say the car would run okay whilst the PGM FI light was on then it could be the primary O2 sensor at fault.

However, I would look at the light on the ECU before condemning anything.



Jun 20, 2008 | Honda CRX Cars & Trucks

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