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What is engine fault code ecu/a?? - Cars & Trucks

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Posted on Jan 02, 2017

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SOURCE: 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

Posted on Jun 05, 2016

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How can you tell if a new gearbox is needed other than a Ecu which has been replaced


have the fault codes read first
if the car is moving in limp mode with no obvious noises or problems , replacement of the box is a total last resort
light on the dash and limp mode can be transmission or engine or both but the fault codes will show the problem area
The ECU -- engine control unit or ECM --engine control module gets messages from the transmission control module ---TCM--and that TCM controls solenoids and servos , vss and other items that if faulty will put the car in limp mode
read the fault codes

Sep 20, 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

I have a fault diagnosed as DF055 on A Clio 2012 I Music 1.2 L. Is this linked to the crankshaft sensor and would this cause difficulty in starting and sluggish performance


Fault code description: DF055 Coded line circuit,Short circuit to +12V.Active - this code DF055 is Cylinder 4 injector circuit

Try checking the voltage on the immo wire that connects the immo ecu with the engin ecu this is the coded line. on this wire must be a signal and the Max. amplitude is 5v. if you measure more than 5 volts then check wire or any interference on it . if you dont know where to find the wire then look for pin 59 at engine ecu .

Nov 24, 2014 | Cars & Trucks

1 Answer

Toyota v6 3 0 Estima


ck for poor ground connections engine to body, also possible ecu fault, ecu should set failure code if light is coming on

Sep 03, 2013 | Cars & Trucks

1 Answer

Truck will be running fine, then all of a sudden it will completely shut off. After we wait a few minutes and pump the clutch and make sure it is all the way to the floor it will start, sometimes. S


You need the engine computer scanned for fault codes, i thank you have an ignition control problem like a module or distributor pickup coil issue. These parts whenthey fail should leave fault cdes so get them read.
Next, the check engine light will pause shortly followed by the second digit of the trouble code. For example if the check engine light blinks once and pauses followed by six blinks the trouble code number would be 16. If no code is present the check engine light will stay one constantly. To restart code gathering turn the ignition key to the "off" position, wait three minutes and turn the ignition key back "on" again without starting the engine. Remove the jumper wire once code gathering is complete. To clear code after the repairs have been made remove the negative battery cable for one minute and reconnect.
toyota_dianostic_connector.jpg
Toyota Diagnostic Connector
Toyota Code Definition Table
Code 11 Momentary interruption in power supply to ECU (electronic control unit or computer) up to 1991
Code 12 Engine revolution signal missing Code 13 Rpm signal to ecu missing above 1000 rpm
Code 14 Igniter signal to ecu missing
Code 16 A/T control signal missing from ecu
Code 21 Main oxygen sensor signal fault
Code 22 Water temperature sensor circuit fault
Code 23 and 24 Intake air temperature signal fault
Code 25 Air/fuel ratio LEAN
Code 26 Air/fuel ratio RICH
Code 27 Sub-oxygen sensor signal or heater circuit fault
Code 28 No. 2 oxygen sensor/heater signal fault
Code 31 and 32 Air flow meter circuit or Vacuum sensor signal fault Code 34 and 36 Turbo-charging pressure signal fault
Code 35 Altitude compensation sensor signal fault
Code 41 Throttle position circuit fault
Code 42 Vehicle speed sensor circuit
Code 43 No starter signal to the ecu
Code 51 AC signal on; DL contact off (in transmission shifter with diagnostic connector jumped)
Code 52, 53 and 55 Knock sensor fault Code 71 EGR system malfunction
Code 72 Fuel cut solenoid signal fault
Code 78 Fuel pump control signal fault
Code 81, 83, 84 and 85 TCM communication fault

Jun 28, 2012 | Cars & Trucks

2 Answers

Toyota 4runner 1994 engine codes 12,52,71 what are these


Code 12 Engine revolution signal missing
Code 52 Knock sensor fault
Code 71 EGR system malfunction

May 04, 2011 | Toyota 4Runner Cars & Trucks

1 Answer

I bought use tercel 99 its manual trans 152000km run fin for 2 day then engine light turn on still run good it just use mor gas


I assume you are referring to the Check Engine light on the dashboard. The ECU (engine management computer) will have logged a fault. A Haynes manual or similar may tell you how to read the error codes that are stored in the ECU. When you have read the codes, it will tell you which engine components are suspect and need checking. As the fuel consumption has gone up noticeably since the light came on, it suggests that the error code will relate to a fuel system fault. For information when the ECU detects that an engine sensor is giving unexpected readings, it overrides (or ignores) the input from that sensor and replaces it with a safe "get you home" value. In doing so, this may lead to more fuel being supplied to the engine than would be the case if the engine sensor was working properly. If you aren't able to read the engine codes yourself, you might prefer to take the car to a garage and they will be able to interrogate the ECU for you.

Nov 14, 2009 | 1998 Toyota Tercel

1 Answer

Lack of power renault software fault code df055


Fault code description: DF055 Coded line circuit,Short circuit to +12V.Active - this code DF055 is Cylinder 4 injector circuit

Try checking the voltage on the immo wire that connects the immo ecu with the engin ecu this is the coded line. on this wire must be a signal and the Max. amplitude is 5v. if you measure more than 5 volts then check wire or any interference on it . if you dont know where to find the wire then look for pin 59 at engine ecu .

Oct 23, 2009 | Renault Sportwagon Cars & Trucks

1 Answer

SERVICE ENGINE LIGHT ON


There is a problem with the emissions system, an the ECU has set a fault code. The ECU will have to be scanned. The fault code you retrieve will help in determining what the problem is.

Aug 02, 2009 | 1997 Saturn SW

1 Answer

XJR 2004 showing warning on dash engine fault, parking brake fault, DSC not available and no power to engine can not accelrate


That's 3 different ECU's. So look for a common fault. Have you had reason to jump start it before this happened? If the leads were inadvertently put on the wrong way round, this could cause permanent damage to the ECU's. If not, then I would go for an earthing fault. The engine ECU is under the passenger's footwell, trace the black cables to the earthing point, I know the earthing point for the ABS unit is right next to it on top of the chassis rail. Failing any of this, I would then get the fault codes pulled at least for the engine ECU and see what it has to say.

Jul 10, 2009 | 2004 Jaguar XJR-Series

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