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Hooked up battery backwards now engine isn't

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  • Cars & Trucks Master
  • 3,799 Answers

No. Replace the Engine control unit that was destroyed when you reversed the polarity to it.

Posted on Jul 22, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 10 Answers

SOURCE: 2007 Jeep Wrangler Unlimited Crank-No Start. Replaced FP.

Hey Tim take a look at this, will this help ?
SUBJECT:
No Engine Crank Or No Engine Start Due To Electronic Lockup Of The WCM / SKREEM
OVERVIEW:
This bulletin involves the replacement of the Wireless Control Module (WCM), and if
equipped, the replacement of the Electric Steering Column Lock (ELV). The WCM is also
referred to as the Sentry Key Remote Entry Module (SKREEM).
MODELS:
2007
SYMPTOM/CONDITION:
The customer will experience a no engine crank AND a no engine start condition. Also, the
remote keyless entry (RKE) system will not operate. This condition may be due to an
electrostatic discharge (ESD) from the ignition key into the Wireless Control Module
(WCM), causing the WCM to electronically lockup. This condition may occur more
frequently in dry and/or cold weather conditions where a sufficient electrostatic charge is
more easily produced. This condition is corrected by the replacement of the WCM
DIAGNOSIS:
1. With the condition present (i.e. the vehicle in the no crank / no start condition), connect
the StarSCAN® scan tool to the vehicle.
2. Turn the ignition switch to the “ON” position, and power up the StarSCAN®.
3. If the WCM is electronically locked up, the StarSCAN® will display the WCM as being
“off bus”.
4. If the no crank / no start condition is present, and the WCM is “off bus”, then reset the
WCM by temporarily removing the IOD fuse (with the key out of the ignition switch),
wait for 10 seconds and then reinstall the IOD fuse.
5. With the IOD fuse reset having been performed, verify that the vehicle will now crank,
start, and run.
6. If the condition is temporarily corrected by performing the above steps, and if the part
number of the WCM is earlier than the part number of the WCM listed in the part
reference table in the Service Bulletin Parts Required Section below, then perform the
Repair Procedure.

Posted on Jun 24, 2009

  • 1071 Answers

SOURCE: 2000 kia sportage pump is working relays have been

there is a splice for fuel injectors at the front of the fuel rail conduit and electric tape will need to be removed to see if it is ok then clean up all engine grounds and ecm grounds on passenger side kick panel if this doesnt help check coils and crank sensor

Posted on Jul 22, 2009

Mustgo
  • 2359 Answers

SOURCE: 93 oldsmobile bravada won't start. Was running

Are you one of those people who TOP OFF the tank when filling up?

When the EVAP recovery system soak with few ounce of gasoline......the trap vapor will take few days escape.

EVAP system is design to handle fuel vapor. Few ounce of gasoline can damage the fuel vapor recovery relay and decrease the service live of the recovery lines.

=========

You can accelerate the process by locating the charcoal canister (near the nose of the car and same side as your gas filler door)

MOVE the car to outdoor.

Disconnect the EVAP line and let it air out by itself.

DO NOT introduce any heat source or fan to speed up the process.

Reconnect this EVAP hose and use a small amount of starting fluid at the intake manifold.


Please post more information by Clicking on the comment link.

I will follow up.

Posted on Dec 03, 2009

  • 1 Answer

SOURCE: no spark no fuel no start! replaced and checked

funny thing is I have a 2002 GTI with the exact same problem. have spent the last three days at work trying to figure things out.. best of luckn email me if you figure anything out. Beattie411@gmail.com

Posted on Mar 19, 2010

  • 1 Answer

SOURCE: having problem starting 2000 jaguar

RESET THE COMPUTER, IT WORKED ON MY XJ. SAME PROBLEM I HAD.

Posted on Dec 15, 2010

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Saturn jumper cables hooked up backwards


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Hooked battery ou backward want crank


Ok. You have conflicting statements here. You say it won't crank. That is supposed to mean that the engine will not spin when the ignition switch is turned. Cranks but won't start sounds more like what you are getting at from the second statement that spraying gas in cause the engine to "hit" as you say. Am I to understand that you hooked the battery up backwards? If you did I'm very surprised you got that much to work. By your lack of knowledge of standard mechanic terminology, you come across as one who does not normally work on vehicles. I don't know what to tell you, but if you are careless (or ignorant) enough to hook the battery up backwards, the level of work that will be required to repair the electrical damage done by that act is most likely beyond your ability to execute. Take your car to a good mechanic or better yet, and auto electric service center.

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you try to crank the car with the battery hooked up backwards?

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check all your rounds on the body, behind kick panels, and in engine compartment. The relays you hear clicking are the power relay whcih turns your engine computer on. The other relay is the fuel pump relay, which is turned on by the engine computer. start there, report back.

PS. When you press the gas pedal to the floor during cranking, it shuts off the fuel supply to clear a flooded engine.

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