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Code u1221 car wont start

Replaced ecu. no communication with ecu throw scan tool.

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VS COMMODORE My battery was accidentally connected wrong and now the car wont start ...

probably fried the ECM
substitute it with a known good one and go from there

Jul 03, 2016 | Cars & Trucks

1 Answer

2002 rodeo is my obd ground bad my ecu wont communicate and horn wont blow but fuse is good

great question, im ane ECU spirt. )EFI.
what country, nobody ever says, that but gee, the OBD varies buy
Ill pretend USA. /Canada.

In the USA the car has OBD2. and you need a scan tool that works
on 2002 cars.
what engine, some engines have different ECU. radical differ..
they had like 3 engines here, other countries 9.

the scan tools connects to the 16pin, OBD2 connector at dash.
i the car is Can-bus. it needs a can-bus tool, all new tools work on canbus but old ones never do. (i have them back to 1995 and know this)
NON comms and tool is ok, not wrong tool . diagnosis.

  1. Pin 16 not at 12vdc, (blown fuse)
  2. ECU dead, 99% of time blown fuse to EFI. test the fuses to all EFI parts. wiring shows that.
  3. bad wiring to the DCL connector (rare) or from there to ECU
  4. yes, some crappy tools have no ground on both pin 4 and 5, buy a tool that has 2 pins there. OR it will fail on some cars. seen many POS ELM327 tools that do this horror, get a tool called, INNOVA 3160 and stop guessing, this tool works on all cars.
  5. barrow, rent , or buy or ask any sharp mech top scan car , his tool works.
  6. Fuses that look ok can IN FACT be bad, we never assume they ar good we test them. using either method, OHMS or 12vdc on both sides, is better. see? only the voltage matters, all else punts.
  7. The 3.3l communicates on pin 1 and 2..
pin 2 is PCM/ECU. VPW signalling.
and is not can-bus, yet.
simular to this.

top right photos

there you go, you tool must have VPW support on pin 2.

Apr 01, 2014 | 2002 Isuzu Rodeo

1 Answer

Vehicle not starting

are you getting lights and ignition display. when you turn ignition do you hear a clicking sound ? there is a ignition control relay/ computer this will stop engine from running and will stop the ecu from being read. it is fitted under the dash usually behind the steering console. check this first before changing the ecu.

Jan 14, 2014 | 1997 Kia Sportage

1 Answer

Car wont start if driven a distance and turned off, have to open hood to cool it acura 98 tl 2.5

hot soak failures, (im good at those, my specialty (electronics)
1: lost spark that first thing to do failed is check for spark.
if spark bad,? 1998 ( ill post for NOT FLOODING and tuned up,)
do this and the ECU will tell you why !!!
1: connect any scan tool to the 16pin DLC port. next to knees
2: crank for 5seconds.
3: release key, do not turn of key
see those DTC errors. that IS the cause.
p0340 ,355? or any codes, they will tell you if
CMP fails, CKP failed, or just spark.

the ecu makes spark, so if CMP/CMP fails, it sees that fast.
if CMP/CKP are bad, it will throw bad spark codes. for bad coil.

Sep 12, 2013 | Acura TL Cars & Trucks

1 Answer

I have a 94 4runner and i put a scan tool to the diagnosis port and it said no communication i got a new ecu and still the same i also aibt gwttin spark my engine just cranks and wont start help please

Are trying to get an engine code? If so you can manually Access that by taking a paperclip, bend it to the shape of a "U" the. Connect the TE1 to the E1 by just plugging either side if the paperclip in. The. Go look at how many times your "check engine light flashes" then search the code!!

Dec 19, 2012 | 1994 Toyota 4Runner

1 Answer

Hello Friends, I need help and advice. I have a Mazda Tribute 2.3 (2005 Mechanical) is the same as the Ford Escape and Mercury Mariner. Step to indicate symptoms: The vehicle began to take a few...

Communication errors with the vehicle's ECU does NOT mean that you need to replace the ECU OR the car! This code means that there is a problem with your Control Area Network (CAN).
Your vehicle has many computer modules onboard. The CAN is what networks all of these modules together so they can share information with each other and with your scan tool. (I like to call this the phone line) ...Your phone line is down! :) When your phone line is down, you do not throw away the phone (ECU) or the house that the phone is in (the car). You repair the phone line.

The way you have described the problem, It sounds like your battery is very low. I would begin to diagnose this problem by testing the battery and the rest of the charging system (wires, cables, alternator, etc.).

Many communication errors can be fixed by repairing the battery or charging system.

If repairing the battery and/or charging system does not help, you will need a true scan tool (NOT a generic code reader) to diagnose your CAN circuits.

Jul 26, 2011 | 2005 Mazda Tribute

1 Answer

Truck shutting down,cant read ecu with scanner

If the ECU will not communicate with the scan tool, and there is no damage to the wiring harness, then it is time to replace the ECU

Mar 12, 2010 | 1996 Chevrolet K1500

2 Answers

2001 sentra no communication with scan tool

Take a few minutes to make sure you dont have a blown fuse....Run through them with your test light...

Nov 17, 2009 | 2001 Nissan Sentra

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