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Re: battery down wont crank
I repaired my Postmans Golf with the same problem. From the brief description given I'm presuming you turn the key all the way and Zip nothing? It is a common fault,the Ignition switch has a module which wears out so that all systems light up and as you take the terminal too the starter solenoid power it doesn't make contact.
I fitted a fused push to make button switch (Maplin's £3.50) and to the solenoid wire in the ignition wiring loom (Hot Wired the starter) It is still working 5 yrs later. He is proud,as Mini use the same style push button starting! on the 08 models.
However you could purchase the push on replacement part from V.W. My Post was quoted £175 fitted from V.W. Franchisee I did it for £40 all in.
I hope this throws light on the problem.
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Yes, the ECM is the last thing to replace after all other possibilities. No spark could be bad ignition coil, bad Ignition Control Module (controls the coil circuits for spark), bad plug wires, the crank and cam sensors (for ECM to determine spark timing).
Check the ICM -it can be tested at a parts store. If good, check the crank sensor.
Okay, the possibilities are great. need to narrow it down a little.
If it fails to crank over it is likely the battery.
If it cranks over ok, but fails to start it is either lack of fuel or lack of spark.
the Quickest way to identify lack of fuel or lack of spark is to spray in a 2 second dose of starting fluid into the air intake. If it fires up then dies in this test it is lack of fuel most common suspect is fuel pump relay or fuel pump.
If it fails to fire up on the starting fluid test it is lack of spark. Electronic ignition trouble shoot procedure from your shop manual for your VIN number will be required.
If the passkey system were not working the engine should not crank and the fuel injectors would be dead. The security light would also stay on. The fuel pump relay gets battery voltage and also voltage from the key switch. The computer grounds the relay to power the pump. The crank sensor does not come into play until the engine is cranking and it supplies a signal for the ignition and injector pulse. Are you not getting power from the key switch to the relay, or from the battery side to the relay ?
well you wont save money if you guess either but do this. Is it equipt with a tach meter (RPM range)? if it does we will use it to trouble shoot the car. Okay when you crank it do you see the needle moving just tiny tiny bit,if you then we know there is spark.how coil pulse are pick up by the tach. Okay now the fuel section have some one cycle the key but dont start. have the gas cap open, use you ear so you hear the pump,it will be hard to hear , can you hear it, now lets check the ignition switch why check Honda uses a ground signal to turn on the fuel pump when your ignition switch fails even though it cranks you wont get a fuel signal. and no pump the only way to know for certainty is a test light, there are relays that why you cycle the switch and there is a pump fuse and that in the engine comportament and it is marked as fuel pump fuse.
The power to the ignition coil comes from the Auto shut down relay. It also runs the fuel pump relay. When you turn the key on it will read 12 volts, but only for about 5 seconds. The auto shut down relay is controlled by the ecm. Check the power on the coil while cranking the engine. When cranking the ecm will lock on the ASD relay.
sounds like a bad battery or the battery cables are corroded where they hook up to the battery or loose. if it cranks for a couple seconds slow than clicks quickly there isnt enough voltage getting to the starter. not all new parts are good.
You will have to pull a spark plug out to check that you have spark when cranking the engine,while you have the plug/s out do a compression test to determine health of engine and wether it is in fact giving compression,eliminates other potential faults if compression is good.If you have compression(around 140 ish)and introduced fuel and it wont fire up it only leaves electrics as the fault.3 major engine requirements to run Fuel,Compression,ignition.When checking spark at night is best as you can easily see wether you have the correct type of spark,Blue and if its quite you will hear the spark as well.Your fault is consistant with ignition module,coil or lack of power to ignition.Faulty modules will give a spark but its too weak to ignite fuel and the spark will be yellow in color.Let me know how it goes.Good luck