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How do i fix to get signal from ECU to feed 6 injectors, permanent 12v are their.

After ignition turn on permanent 12v are their,but no signal come from ECU when crank it?

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You'll need a repair-shop manual to troubleshoot the engine computer and components.
The computer takes input from the crank and cam sensors (if equipped) and grounds the injectors when needed.

Posted on Mar 27, 2015

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2 Answers

Ecm fuse problems


Well if you've had your ECM burn and got it changed and the same thing happen again then there might be a pilled positive wire exposed to the body or the chassis of your car touching at some point,my best advice is to trace all positive heavy wires leading from the starter and under the fuse board as well.i hope this helps thanks

Jun 23, 2014 | 2003 Ford F150 Regular Cab

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Jaguar xj sport 3.2 no spark or injector pulse


If ECU has crank signal and engine turns over, ECU should give injectors a pulse and trigger the ignition. If not ECU might be bad. You should check power and grounds going to ECU. There are usually multiple power and grounds going into ECU

Jan 06, 2014 | Cars & Trucks

1 Answer

Ecu not giving signal to injectors?


Hi Daw, As you've already checked the crankshaft sensor, sounds to me as if the problem may be from the camshaft pickup sensor. If that one also proves fine you'll need to have the anti theft system re-coded. The anti theft unit cuts the injection. Regards John

Jan 13, 2013 | Jeep Cherokee Cars & Trucks

1 Answer

I have a 1988 300zx non turbo 3.0 just replaced the ecu thinking it was the problem but its not. My car will turn over and it sparks, tested the fuel pressure and it makes 42lbs so thats not the problem...


The pulse to switch the coils comes from the crankshaft sensor via the ecu. Pulse to switch injectors comes from the CAMshaft sensor via the ecu. Check injector wiring plugs and confirm there is an ignition live of 12v at one side. Other side should have an earth pulse when cranking.Once you know which is missing you can trace the fault backwards. ( if no ignition live then check wiring, relay, fuse etc) if no earth switching check camshaft sensor and wiring.

May 29, 2011 | 1988 Nissan 300ZX

1 Answer

I have the yellow and red connected together and I have no memory


yes that would be right then ,the red is the feed and the yellow is the 12v permanant feed ,look on the wires and it may be marked in small print what one is the feed from the aux on the ignition switch and the other the permanant 12v memory feed

Jan 26, 2011 | 2004 Dodge Ram 1500

1 Answer

I need a honda car code , i can't turn on my radio


service manual.
Code Description Possible Cause
0 ECU / ECU signal No signal to ECU
1 Oxygen sensor circuit Oxygen sensor or circuit, ECU
2 Oxygen sensor circuit Oxygen sensor or circuit, ECU
3 MAP sensor circuit Map sensor circuit
4 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
5 MAP sensor circuit MAP sensor or circuit, mechanical
problem
6 ECT sensor circuit ECT sensor or circuit, automatic
transaxle control unit
7 TPS / Angle Sensor TPS sensor or circuit, automatic
transaxle control unit
8 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
9 CMP sensor CMP sensor or circuit
10 IAT sensor IAT sensor or circuit
11 Idle Mixture Adjuster Sensor Idle mixture adjuster sensor or
circuit
12 EGR system fault No EGR action, faulty EGR valve
13 BARO sensor circuit BARO sensor or circuit
14 Idle Air Control valve circuit / ECU Open or shorted out ignition signal
circuit / No signal to ECU
15 Ignition Output signal Open or shorted ignition output
signal circuit
16 Fuel Injector Circuit Open or shorted fuel injector
circuit
17 VSS circuit VSS sensor or circuit
18 Ignition Timing Adjuster Open or shorted signal circuit
19 A/T Lock-up control solenoid Open or shorted signal circuit,
Lock-up control solenoid lock-up solenoid
20 Electrical Load Detector / Sensor Electrical load detector or circuit
Honda/Acura
Fault Code Definitions (21 - 59)
Chapter 3 22
Code Description Possible Cause
21 Spool Solenoid Valve Open or shorted signal circuit,
spool solenoid valve
22 Valve Timing Electronic Oil Open or shorted signal circuit,
pressure switch valve timing oil pressure switch
23 Knock sensor circuit Knock sensor or circuit
30 AT / ECU communication signal A AT control unit, ECU
31 AT / ECU communication signal B AT control unit, ECU
35 Traction control / ECU / signal Traction control module, ECU
36 Traction control / ECU / signal Traction control module, ECU
41 Oxygen sensor heater - left side Oxygen sensor / heater or circuit
42 Oxygen sensor heater - right side Oxygen sensor / heater or circuit
43 Fuel Supply system - left side Oxygen sensor or circuit, fuel
system
44 Fuel Supply system - right side Oxygen sensor or circuit, fuel
system
45 Fuel metering - left side Injector control circuit, incorrect
fuel metering
46 Fuel metering - right side Injector control circuit, incorrect
fuel metering
48 Heated oxygen sensor Oxygen sensor or circuit
53 Right Knock Sensor Right knock sensor or circuit
54 CKP sensor 2 CKP sensor 2 or circuit
59 CMP sensor 2 CMP sensor 2 or circuit

Dec 28, 2010 | 1994 Honda Accord

3 Answers

Onley firin on 2 clynders


I would check the injectors for each cylinder, and check for spark in each cylinder.

If the injectors are not firing in all cylinders, it may be a computer.

If spark occurs in some but not all cylinders, it could be an ignition coil.

DISTRIBUTORLESS IGNITION SYSTEM General Information A distributorless ignition system is used on all 2.2L and 2.5L models. The system consists of a cam and crankshaft angle sensor, knock sensor, two ignition coils, an Electronic Control Unit (ECU) and assorted sensors. The system control features a quick response learning control method that compares data stored in the ECU memory to data received from the sensors. Thus, the ECU constantly provides the optimum ignition timing in relation to output, fuel consumption, exhaust gas and other variables. The ECU receives signals from the airflow sensor, water temperature sensor, crank angle sensor, cam angle sensor, knock sensor and other various indicators to judge the operating condition of the engine. It then selects the optimum ignition timing stored in the memory and immediately transmits a primary current OFF signal to the igniter to control the ignition timing. The ECU also receives signals emitted from the knock sensor. Ignition timing is controlled so that advanced ignition timing is maintained immediately before engine knock occurs. Two ignition coils are used, one for the No. 1 and No. 2 cylinders, and one for the No. 3 and No. 4 cylinders. A simultaneous ignition type is employed for each bank of cylinders. This eliminates the distributor and achieves maintenance free operation. Ignition control under normal conditions is performed by the ECU measuring engine revolutions. Using the data it receives, the ECU decides the ignition timing according to engine operation. Ignition control under starting conditions is set by the ECU at 10°BTDC. prev.gif next.gif

Sep 02, 2010 | 1995 Subaru Impreza

1 Answer

GOLF MK3 NON START


check for 12v at injector plug if no 12v this is fed from the ecu so backtrack all fuses and ecu feeds
you may need new ecu control unit but be sure to check all 12v feeds and earths etc

Jul 01, 2010 | 1996 Volkswagen Golf

2 Answers

Jaguar xj6 4.0 1990. showing fault code fuel 14, fail 14. what does this code mean ?


2 airflow sensor out of operating range 3 coolant temp sensor out of operating range 4 oxy sensor indicates full rich 5 throttle potentiometer/airflow sensor... (low throttle pot signal with high airflow sensor signal) 6 throttle pot/airflow sensor...... (high throttle pot signal with low airflow sensor signal) 7 throttle pot...idle fuel adjustment failure(idle speed??) 8 intake air temp sensor...open or shorted circuit to sensor 11 Throttle pot at idle: Throttle pot idle trim out of normal range 12 Airflow meter: MAF signal out of range 14 Coolant thermistor: Resistance out of range or static during engine warm up 16 Air thermistor: Resistance out of range 17 Throttle pot: Out of range 18 Throttle pot/Airflow: Low throttle pot signal at high airflow 19 Throttle pot/Airflow: High throttle pot signal at low airflow 22 Fuel pump drive: ECU output to fuel pump relay 23 Fuel supply: Engine running too rich 24 Ignition Drive: ECU output to ignition Amp 26 Air leak: Engine running too lean 29 ECU self check 33 Injector Drive: ECU output to injectors 34 Injector: Looks for Injector dribble 37 EGR Drive: ECU output to EGR switching valve 39 EGR check sensor: EGR not working (normally pipe blocked) 44 Lambda (O2) sensor: Poor mixture control rich or weak (or misfire) 46 Idle speed Control valve: ECU output to Coil AB 47 Idle speed Control valve: ECU output to Coil CD 48 Idle Speed Control Valve: Stepper motor grossly out of position 66 Air pump: ECU output to air pump relay 68 Road speed sensor: Seen speed < 5km/h at high engine airflow 69 Drive/Neutral switch: Seen cranking in "D" or high airflow in "N" 89 Purge Valve drive: ECU output to purge valve
this is all I could find

Nov 09, 2009 | 1990 Jaguar XJ6

1 Answer

I have a 1994 Toyota 4Runner with a V6 and the check engine light came on i jumped the terminals and code 14 and 26 came up. what does the codes mean?


These are the codes and possible causes taken from http://www.off-road.com/toyota/tech/codes/
Code 14 :
IGNITION SIGNAL--NO "IGF" SIGNAL TO ECU
--IGNITER/IGNITER CIRCUIT
--IGNITER AND IGNITION COIL/CIRCUIT
--ECU

Code 26 :
AIR/FUEL RATIO RICH INDICATOR
--INJECTOR FAULT(S)
--FUEL PRESSURE
--OXYGEN SENSOR
--AIRFLOW METER OR MAP SENSOR
--IGNITION
--ECU
--COLD START INJECTOR

Sep 17, 2009 | 1994 Toyota 4Runner

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